Friedrich air conditioner troubleshooting

A vividly expressed tendency towards increase of demand for an economical climatic technique has appeared recently. The company focused its attention on provision of non-sound operation, superior air distribution, features of rational use of energy, simplified installation, and reduction of load on a service staff. It is achieved, inter alia, by application of efficient Friedrich air conditioner troubleshooting system allowing to identify any case of malfunction and determine ways of its removal.

Friedrich air conditioner troubleshooting cooling

PROBLEMPOSSIBLE CAUSETO CORRECT
Compressor does not runLow voltageCheck for voltage at compressor. 115 volt and 230
volt units will operate at 10% voltage variance
Thermostat not set cold enough
or inoperative.
Set thermostat to coldest position. Test thermostat
and replace if inoperative
Compressor hums but cuts off on
overload
Hard start compressor. Direct test compressor. If
compressor starts, add starting components
Open or shorted compressor
windings
Check for continuity and resistance
Open overloadTest overload protector and replace if inoperative
Open capacitor.Test capacitor and replace if inoperative.
Inoperative system switchTest for continuity in all positions. Replace if
inoperative
Broken, loose or incorrect wiringRefer to appropriate wiring diagram to check wiring
Fan motor
does not run
Inoperative system switch.Test switch and replace in inoperative.
Broken, loose or incorrect wiring.Refer to applicable wiring diagram.
Open Capacitor.Test capacitor and replace if inoperative.
Fan speed switch open.Test switch and replace if inoperative.
Inoperative fan motor.Test fan motor and replace if inoperative.
(Be sure internal overload has had time to
reset.)
Does not cool, or cools
only slightly
Undersized unitRefer to Sizing Charts.
Thermostat open or inoperative.Set to coldest position. Test thermostat and
replace if necessary
Dirty filterClean as recommended in Owner's Manual
Dirty or plugged condenser or
evaporator coil.
Use steam or detergents to clean
Poor air circulation in area being
cooled
Adjust discharge air louvers. Use high fan
speed.
Fresh air or exhaust air door open
on applicable models
Close doors. Instruct customer on use of
this feature
Low capacity – undercharge.Check for leak and make repair.
Compressor not pumping
properly
Check amperage draw against nameplate.
If not conclusive, make pressure test
Unit does not run.Fuse blown or circuit tripped.Replace fuse, reset breaker. If repeats,
check fuse or breaker size. Check for
shorts in unit wiring and components
Power cord not plugged in.
System switch in "Off" positionSet switch correctly.
Inoperative system switchTest for continuity in each switch position.
Loose or disconnected wiring at
switch or other components
Check wiring and connections. Reconnect
per wiring diagram
Evaporator coil
freezes up.
Dirty filterClean as recommended in Owner's Manual
Restricted air flow.Check for dirty or obstructed coil - clean as re-
quired
Inoperative thermostatTest for shorted thermostat or stuck contacts.
Short of refrigerantDe-ice coil and check for leak.
Inoperative fan motorTest fan motor and replace if inoperative
Partially restricted capillary.Deice coil. Check temperature differential across
coil. Touch test coil return bends for same tem-
perature. Test for low running current
Compressor runs
continually.
Does not cycle off
Excessive heat loadUnit undersized. Test cooling performance of unit.
Replace with larger unit
Restriction in lineCheck for partially iced coil. Check temperature
split across coil.
Refrigerant leak.Check for oil at silver soldered connections.
Check for partially iced coil. Check split across
coil. Check for low running amperage.
Thermostat contacts stuckCheck operation of thermostat. Replace if con-
tacts remain closed
Thermostat incorrectly wiredRefer to appropriate wiring diagram.
Thermostat does not
turn unit off.
Thermostat contacts stuckReplace thermostat
Thermostat set at coldest pointTurn to higher temperature setting to see if the
unit cycles off
Incorrect wiring.Refer to appropriate wiring diagram
Unit undersized for area to be cooled.Refer to Sizing Chart
Compressor attempts
to start, or runs for
short periods only.
Cycles on overload
Overload inoperative. Opens too
soon
Check operation of unit. Replace overload if
system operation is satisfactory.
Compressor attempts to start before
system pressures are equalized.
Allow a minimum of two (2) minutes for pressures
to equalize before attempting to restart. Instruct
customer of waiting period
Low or fluctuating voltageCheck voltage with unit operating. Check for
other appliances on circuit. Air conditioner should
be on separate circuit for proper voltage, and be
fused separately
Incorrect wiringRefer to appropriate wiring diagram
Shorted or incorrect capacitorCheck by substituting a known good capacitor of
correct rating
Restricted or low air flow through
condenser coil.
Check for proper fan speed or blocked con-
denser
Compressor running abnormally hotCheck for kinked discharge line or restricted con-
denser. Check amperage
Thermostat does
not turn unit on
Loss of charge in thermostat bulbPlace jumper across thermostat terminals to check
if unit operates. If unit operates, replace thermo-
stat.
Loose or broken parts in thermostat.Check as above.
Incorrect wiring.Refer to appropriate wiring diagram.
Noisy operationPoorly installed unit.Refer to Installation Instructions for proper
installation
Fan blade striking chassisReposition - adjust motor mount
Compressor vibratingCheck that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing
Improperly mounted or loose cabinet
parts.
Check assembly and parts for looseness, rubbing
and rattling.
Water leaks into
room
Evaporator drain pan overflowingClean obstructed drain trough
Condensation forming on base pan.Evaporator drain pan broken or cracked. Reseal
or replace
Poor installation resulting in rain en-
tering room
Check Installation Instructions. Reseal as re-
quired
Condensation on discharge grilles.Dirty evaporator coil - clean. Very high humidity
level.
Thermostat short
cycles
Thermostat differential too narrowReplace thermostat
Plenum gasket not sealing,
allowing discharge air to short cycle
thermostat.
Check gasket. Reposition or replace.
Restricted coil or dirty filter.Clean and advise customer of periodic cleaning of
filter
Tubular insulation missing from top of
thermostat bulb
Replace tubular insulation on bulb.
(Applicable models.)
Thermostat bulb touching thermostat
bulb support bracket
Adjust bulb bracket.
(Applicable models.)
Prolonged off-cycles.
(automatic operation)
Anticipator (resistor) wire
disconnected at thermostat or system
switch
Refer to appropriate wiring diagram
Anticipator (resister shorted or open).
(Applicable models.)
Disconnect plug from outlet. Remove resistor
from bracket. Insert plug and depress "Cool"
and "Fan - Auto (MoneySaver)" buttons. Place
thermostat to warmest setting. Feel resistor for
temperature. If no heat, replace resistor.
Partial loss of charge in thermostat
bulb causing a wide differential
Replace thermostat
Switches from
cooling to heating
Thermostat sticking.Change room thermostat.
Incorrect wiringRefer to appropriate wiring diagram.
Outside water leaks.Evaporator drain pan cracked or ob-
structed
Repair, clean or replace as required.
Water in compressor area.Detach shroud from pan and coil. Clean and
remove old sealer. Reseal, reinstall and check
Obstructed condenser coilSteam clean
Fan blade and slinger ring improperly
positioned
Adjust fan blade to 1/2" clearance from
condenser coil.
High indoor
humidity
Insufficient air circulation in air condi-
tioned area.
Adjust louvers for best possible air circulation
Oversized unitOperate in "Fan-Auto (MoneySaver)" position
Inadequate vapor barrier in building
structure, particularly floors.
Advise customer

Friedrich air conditioner troubleshooting Heating (Heat pumps)

PROBLEMPOSSIBLE CAUSETO CORRECT
No heating;
fan operates.
Thermostat settingSet thermostat to a warmer position.
Defective thermostat.Replace — do not attempt to adjust.
Compressor not operating.Check compressor wiring. Check for open inter-
nal or external overload. Check wiring.
Defective system switchTest system switch
Insufficient heatingRestricted filterClean as recommended in Owner's Manual
Outdoor thermostat.
(Applicable models.)
Check if outdoor thermostat is energizing the
heating element at its predetermined temperature
setting
Fresh air or exhaust door openCheck control setting
Fan operates in
"constant" position,
but not in "automatic"
(MoneySaver).
Inoperative system switchCheck continuity of switch.
Incorrect wiring.Check applicable wiring diagram
Temperature varies
from comfortable to
overly warm
Defective thermostatIncorrect differential setting. Replace thermostat.
Heat anticipator (resistor) shorted.
(Applicable models)
Check voltage to resistor. If voltage okay, remove
resistor from thermostat bulb block. With current
on, feel resistor for warmth. If no heat can be felt,
replace anticipator.
Room temperature
uneven.
(Heating cycle)
Heat anticipator (resistor) shorted.
(Applicable models.)
Disconnect power to unit. Remove resistor from
thermostat bulb block. Plug in unit and allow to
operate. Feel resistor for heat. If no heat is felt,
replace resistor
Wide differential — partial loss of ther-
mostat bulb charge
Replace thermostat and check
Incorrect wiringRefer to appropriate wiring diagram. Resistor is
energized during the "on" cycle of compressor or
fan
Unit will not defrostIncorrect wiring.Refer to appropriate wiring diagram
Defrost control timer motor not ad-
vancing.
Check for voltage at "TM" and "TM1" on timer. If
voltage, replace control
Defrost control out of calibrationIf outside coil temperature is 25° F or below, and
pre-selected time limit has elapsed, replace the
defrost control.
Defrost control contacts stuck.If the contacts remain closed between terminals
"2" and "3" of the defrost control after pre-selected
time interval has passed, replace control.
Defrost control bulb removed from
coil, or not making good coil contact
Reinstall and assure that good bulb to coil contact
is made
Unit does not heat
adequately
Outdoor thermostat does not cut
off compressor at the pre-selected
temperature and bring on the heating
element
Defective thermostat — replace.
Fresh air or exhaust door openCheck if operating properly. Instruct customer on
proper use of control
Dirty filterClean as recommended in Owner's Manual
Unit undersizedCheck heat rise across coil. Refer to performance
data sheet on heat rise at various outdoor ambients.
If heat rise is satisfactory, check if insulation can be
added to attic or walls
Unit cools when heat
is called for
Incorrect wiring.Refer to applicable wiring diagram
Defective solenoid coilCheck for continuity of coil
Reversing valve fails to shift.Block condenser coil and switch unit to cooling. Al-
low pressure to build up in the system, then switch to
heating. If valve fails to shift, replace valve
Inoperative system switchCheck for continuity of system switch
Cooling adequate
—heating insufficient
Heating capillary tube partially re-
stricted
Check for partially starved outer coil. Replace heating
capillary tube
Check valve leaking internallySwitch unit several times from heating to cooling.
Check temperature rise across the coil. Refer to
specification sheet for correct temperature rise
Reversing valve failing to shift com-
pletely — bypassing hot gas
De-energize solenoid coil, raise head pressure, en-
ergize solenoid to break loose. If valve fails to make
complete shift, replace valve
Compressor will not turn
off and operate on heat-
ing element only during
low outside ambients.
Outdoor thermostat.
(Applicable models.)
Refer to the heating data on applicable models for
the pre-selected temperature the compressor shuts
off and the electric element is energized
Compressor shuts
off on outdoor
thermostat but
element does
not heat.
Fuse linkCheck fuse link for continuity. If defective, replace.
Check amperage draw of element. If no amperage,
replace
Heating element shortedCheck voltage to element. If voltage is okay, check
wiring
Heat relay or heater contactor coil
open
Fan Operates
– heating element
does not come on
Heater relay or contactor coil openCheck continuity of coil.
Heater relay or contactor stuck open,
pitted or burned
Inspect, test continuity with ohmmeter.
High limit control openCheck continuity – if open, replace
Open thermal fuse.Check continuity. Check reason for failure
Open or shorted element.Check voltage across heater terminals. Check
amperage draw of heater
Loose connectionsTighten all terminals
Heating inadequateRestricted filterClean as recommended in Owner's Manual.
Cycling high limit controlControl is set to open at 155°F ± 5°F and close
at 130°F ± 8°F. If cycling prematurely, replace
control.
Exhaust or fresh air door open.Check position of fresh air door control slide.
Adjust cable if door does not close properly.
Fan operates in
"Constant" position,
but not in "Automatic"
(MoneySaver)
Fan relay contacts openCheck continuity of fan relay. NOTE: Some
models have the fan relay energized during the
heating cycle while others do not
Inoperative system switch.Check continuity between terminals "L2" and "3"
of the system switch
Loose connection.Check connections on system switch and fan
relay
Long "off" and
"on" cycles
Heat anticipator (resistor) shortedDisconnect power to unit. Remove resistor from
thermostat bulb block. Plug in unit and allow to
operate. Feel resistor for heat. If no heat is felt,
replace resistor
Defective thermostat.Replace thermostat and check operation
Fan motor does not
operate in "Constant"
or "MoneySaver"
position.
Defective motorCheck and replace.
Open or shorted capacitor.Replace capacitor and check.
Condenser fan frozen to base pan.Check if drain pan valve is open. If not, replace.
Loose connectionsCheck all connections. Check voltage to fan
motor
Cooling adequate,
heating insufficient.
Heating capillary tube partially
restricted
Check for partially starved outer coil. Replace
heating capillary tube.
Check valve leaking internallySwitch unit several times from heating to cooling.
Check temperature rise across coil. Refer to
specification sheet for correct temperature rise
Reversing valve failing to shift
completely – bypassing hot gas
De-energize solenoid coil, raise head pressure,
energize solenoid to break loose. If valve fails to
make complete shift, replace valve
Compressor will not
turn off and operate
on heating element
only during low out-
side ambients
Outdoor thermostat.
(Applicable models.)
Refer to the heating data on applicable models
for the pre-selected temperature the compressor
shuts off and the electric element is energized
Compressor shuts
off on outdoor
thermostat but,
element does not
heat.
Fuse linkCheck fuse link for continuity. If defective, replace
Heating element shortedCheck amperage draw of element. If no am-
perage, replace
Incorrect wiringCheck voltage to element. If voltage is okay,
check wiring
Heat relay or heater contactor
coil open
Defective coil. Test coil for continuity.

Troubleshooting Heating

(Cooling/Electric Models)

PROBLEMPOSSIBLE CAUSETO CORRECT
Fan operates
–heating element
does not come on
Heater relay or contactor coil openCheck continuity of coil.
Heater relay or contactor stuck
open, pitted or burned.
Inspect, test continuity with ohmmeter
High limit control open.Check continuity – if open, replace
Open Thermal fuse.Check Continuity. Check reason for failure.
Open or shorted element.Check voltage across heater terminals. Check
amperage draw of heater
Loose connections.Tighten all terminals.
Heating inadequate.Restricted filter.
Cycling high limit control
Clean as recommended in Owner's Manual.
Exhaust or fresh air door openCheck position of fresh air door control slide.
Adjust cable if door does not close properly
Fan operates in
the "Constant"
position, but not
in "Automatic."
(MoneySaver)
Fan relay contacts openCheck continuity of fan relay. NOTE: Some
models have the fan relay energized during the
heating cycle while others do not.
Inoperative system switchCheck continuity between terminals "L2" and "3"
of the system switch
Loose connection.Check connections on system switch and fan
relay
Long "off" and "on"
cycles.
Heat anticipator (resistor) shortedDisconnect power to the unit. Remove the resis-
tor from the thermostat bulb block. Plug in the
unit and allow to operate. Feel the resistor for
heat. If no heat is felt, replace the resistor
Defective thermostatReplace thermostat and check operation
Fan motor does not
operate in "Constant"
or "MoneySaver"
position
Defective motorCheck and replace
Open or shorted capacitor.Replace capacitor and check.
Condenser fan frozen to base panCheck if drain pan valve is open, if not, replace
Loose connections.Check all connections. Check voltage to fan motor
Element does
not heat
Fuse link.Check fuse link for continuity.
If defective, replace
Heating element shortedCheck amperage draw of element.
If no amperage, replace
Incorrect wiringCheck voltage to element. If voltage is okay,
check wiring
Heat relay or heater contactor coil
open
Defective coil. Test coil for continuity.

Friedrich 2007 air conditioner troubleshooting

ProblemPossible CauseAction
Compressor does not runLow voltageCheck voltage at compressor. 115V & 230V units will operate at 10% voltage variance
T-stat not set cold enough or inoperativeSet t-stat to coldest position. Test t-stat & replace if inoperative
Compressor hums but cuts off on B10 overloadHard start compressor. Direct test compressor. If compressor starts, add starting components
Open or shorted compressor windingsCheck for continuity & resistance
Open overloadTest overload protector & replace if inoperative
Open capacitorTest capacitor & replace if inoperative
Inoperative system switchTest for continuity in all positions. Replace if inoperative
Broken, loose or incorrect wiringRefer to appropriate wiring diagrams to check wiring
Fan motor does not runInoperative system switchTest switch & replace if inoperative
Broken, loose or incorrect wiringRefer to applicable wiring diagram
Open capacitorTest capacitor & replace if inoperative
Fan speed switch openTest switch & replace if inoperative
Inoperative fan motorTest fan motor & replace if inoperative (be sure internal overload has had time to reset)
Does not cool or only cools slightlyUndersized unitRefer to industry standard sizing chart
T-stat open or inoperativeSet to coldest position. Test t-stat & replace if necessary
Dirty filterClean as recommended in Owner's Manual
Dirty or restricted condenser or evaporator coilUse pressure wash or biodegradable cleaning agent to clean
Poor air circulationAdjust discharge louvers. Use high fan speed
Fresh air or exhaust air door open on applicable modelsClose doors. Instruct customer on use of this feature
Low capacity - underchargeCheck for leak & make repair
Compressor not pumping properlyCheck amperage draw against nameplate. If not conclusive, make pressure test
Unit does not runFuse blown or circuit trippedReplace fuse, reset breaker. If repeats, check fuse or breaker size. Check for shorts in unit wiring & components
Power cord not plugged inPlug it in
System switch in "OFF" positionSet switch correctly
Inoperative system switchTest for continuity in each switch position
Loose or disconnected wiring at switch or other componentsCheck wiring & connections. Reconnect per wiring diagram
Evaporator coil freezes upDirty filterClean as recommended in Owner's Manual
Restricted airflowCheck for dirty or obstructed coil. Use pressure wash or biodegradable cleaning agent to clean
Inoperative t-statTest for shorted t-stat or stuck contacts
Short of refrigerantDe-ice coil & check for leak
Inoperative fan motorTest fan motor & replace if inoperative
Partially restricted capillary tubeDe-ice coil. Check temp, differential (delta T) across coil. Touch test coil return bends for same temp. Test for low running current
Compressor runs continually & does not cycle offExcessive heat loadUnit undersized. Test cooling performance & replace with larger unit if needed
Restriction in lineCheck for partially iced coil & check temperature split across coil
Refrigerant leakCheck for oil at silver soldered connections. Check for partially iced coil. Check split across coil. Check for low running amperage
T-stat contacts stuckCheck operation of t-stat. Replace if contacts remain closed.
T-stat incorrectly wiredRefer to appropriate wiring diagram
T-stat does not turn unit offT-stat contacts stuckDisconnect power to unit. Remove cover of t-stat & check if contacts are stuck. If so. replace t-stat
T-stat set at coldest pointTurn to higher temp, setting to see if unit cycles off
Incorrect wiringRefer to appropriate wiring diagrams
Unit undersized for area to be cooledRefer to industry standard sizing chart
Compressor runs for short periods only. Cycles on overloadOverload inoperative. Opens too soonCheck operation of unit. Replace overload if system operation is satisfactory
Compressor restarted before system pressures equalizedAllow a minimum of 2 minutes to allow pressures to equalize before attempting to restart. Instruct customer of waiting period
Low or fluctuating voltageCheck voltage with unit operating. Check for other appliances on circuit. Air conditioner should be in separate circuit for proper voltage & fused separately
Incorrect wiringRefer to appropriate wiring diagram
Shorted or incorrect capacitorCheck by substituting a known good capacitor of correct rating
Restricted or low air flow through condenser coilCheck for proper fan speed or blocked condenser
Compressor running abnormally hotCheck for kinked discharge line or restricted condenser. Check amperage
T-stat does not turn unit onLoss of charge in t-stat bulbPlace jumper across t-stat terminals to check if unit operates. If unit operates, replace t-stat.
Loose or broken parts in t-statCheck as above
Incorrect wiringRefer to appropriate wiring diagram
Noisy operationPoorly installedRefer to Installation Manual for proper installation
Fan blade striking chassisReposition - adjust motor mount
Compressor vibratingCheck that compressor grommets have not deteriorated. Check that compressor mounting parts are not missing
Improperly mounted or loose cabinet partsCheck assembly & parts for looseness, rubbing & rattling
Water leaks into the roomEvaporator drain pan overflowingClean obstructed drain trough
Condensation forming on base panEvaporator drain pan broken or cracked. Reseal or replace
Poor installation resulting in rain entering the roomCheck installation instructions. Reseal as required
Condensation on discharge grille louversClean the dirty evaporator coil. Use pressure wash or biodegradable cleaning agent to clean
Chassis gasket not installedInstall gasket, per Installation manual
Downward slope of unit is too steepRefer to installation manual for proper installation
Water "spitting" into roomSublimation: When unconditioned saturated, outside air mixes with conditioned air, condensation forms on the cooler surfacesEnsure that foam gaskets are installed in between window panes & in between the unit & the sleeve. Also, ensure that fresh air/exhaust vents (on applicable models) are in the closed position & are in tact
Downward pitch of installation is too steepFollow installation instructions to ensure that downward pitch of installed unit is no less than 1/4" & no more than 3/8“
Restricted coil or dirty filterClean & advise customer of periodic cleaning & maintenance needs of entire unit
Excessive moistureInsufficient air circulation thru area to be air conditionedAdjust louvers for best possible air circulation
Oversized unitOperate in "MoneySaver" position
Inadequate vapor barrier in building structure, particularly floorsAdvise customer
T-stat short cyclesT-stat differential too narrowReplace t-stat
Plenum gasket not sealing, allowing discharge air to short cycle t-statCheck gasket. Reposition or replace as needed
Restricted coil or dirty filterClean & advise customer of periodic cleaning & maintenance needs of entire unit
Prolonged off cycles (automatic operation)Anticipator (resistor) wire disconnected at t-stat or system switchRefer to appropriate wiring diagram
Anticipator (resistor) shorted or openDisconnect plus from outlet. Remove resistor from bracket. Insert plug & depress "COOL" & "FAN AUTOMATIC" buttons. Place t-stat to warmest setting. Feel resistor for temperature. If no heat, replace resistor
Partial loss of charge in t-stat bulb causing a wide differentialReplace t-stat
Outside water leaksEvaporator drain pan cracked or obstructedRepair, clean or replace as required
Water in compressor areaDetach shroud from pan & coil. Clean & remove old sealer. Reseal, reinstall & check
Obstructed condenser coilUse pressure wash or biodegradable cleaning agent to clean
Fan blade/slinger ring improperly positionedAdjust fan blade to 1/2” of condenser coil
Room temperature uneven (Heating cycle)Heat anticipator (resistor) shorted (on applicable models)Disconnect power to unit. Remove resistor from t-stat bulb block. Plus in unit & allow to operate. Feel resistor for heat. If not heat, replace resistor
Wide differential - partial loss of t-stat bulb chargeReplace t-stat & check
Incorrect wiringRefer to appropriate wiring diagram. Resistor is energized during "ON" cycle of compressor or fan.
Unit will not defrostIncorrect wiringRefer to appropriate wiring diagram
Defrost control timer motor not advancing (applicable models)Check for voltage at “TM" & "TM1" on timer. If no voltage, replace control
Defrost control out of calibration (applicable models)If outside coil temperature is 25F or below. & preselected time limit has elapsed, replace defrost control
Defrost control contacts stuckIf contacts remain closed between terminals "2" & "3" of the defrost control after preselected time interval has passed, replace control
Defrost control bulb removed from or not making good coil contactReinstall & be assured that good bulb to coil contact is made
Does not heat adequatelyExhaust or fresh air door openCheck if operating properly. Instruct customer on proper use of control
Dirty filterClean as recommended in Owner's Manual
Unit undersizedCheck heat rise across coil. If unit operates efficiently, check if insulation can be added to attic or walls. If insulation is adequate, recommend additional unit or larger one
Outdoor t-stat open (applicable models)T-stat should close at 38°F. Check continuity of control. If temperature is below 38°F, replace control
Heater hi-limit control cycling on & offCheck for adequate fan air across heater. Check control for open at 160°F & dose at 150°F
Shorted supplementary heaterOhmmeter check, approx. 32-35 ohms
Incorrect wiringCheck applicable wiring diagram

Friedrich CP05N10 air conditioner troubleshooting

COMPLAINTCAUSEREMEDY
Fan motor will not run.No powerCheck voltage at outlet. Correct if none.
Power supply cordCheck voltage to electronic control board. If none, check power supply cord. Replace cord if circuit is open.
Wire disconnected or connection looseConnect wire. Refer to wiring diagram for terminal identification. Repair or replace loose terminal.
Capacitor (Discharge capacitor before testing.)Test capacitor.
Replace if not within ±10% of manufacturer's rating. Replace if shorted, open, or damaged.
Will not rotateFan blade hitting shroud or blower wheel hitting scroll. Re-align assembly.
Units using slinger ring condenser fans must have 1/4" inch clearance to the base.
If necessary, shim up the bottom of the fan motor with mounting screw(s).
Check fan motor bearings; if motor shaft will not rotate, replace the motor.
Fan motor runs.Revolves on overloadCheck voltage. See limits on this page.
If not within limits, call an electrician.
Test capacitor.
Check bearings. Does the fan blade rotate freely?
If not. replace fan motor.
Pay attention to any change from high speed to low speed. If the speed does not change, replace the motor.
Fan motor noise.Fan bladeIf cracked, out of balance, or partially missing, replace it.
Blower wheelIf cracked, out of balance, or partially missing, replace it.
Loose set screwTighten it.
Worn bearingsIf knocking sounds continue when running replace the motor. If the motor hums or noise appears to be internal while running, replace motor.
Compressor will not run, fan motor runs.VoltageCheck voltage. See the limits on the preceding page. If not within limits, call an electrician.
WiringCheck the wire connections; if loose, repair or replace the terminal. If the wires are discon- nected, refer to wiring diagram for identification, and replace the wires. Check the wire connections; If not according to the wiring diagram, correct the connections.
ThermistorCheck the TEMP control. If not at the lowest number, set TEMP control to this setting.
Check the continuity of the thermistor. Replace the control board if the circuit is open.
Capacitor (discharge capacitor before servicing.)Check the capacitor. Replace if not within ±10% of manufacturer’s rating, replace if shorted, open, or damaged.
CompressorCheck the compressor for open circuit or ground. If open or grounded, replace the compressor.
OverloadCheck the compressor overload if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.)
Compressor cycles on overload.VoltageCheck the voltage. See the limits on the preceding page. If voltage is not within these limits, call an electrician.
OverloadCheck overload, if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.)
Compressor cycles on overload.Fan motorIf not running, determine the cause. Replace if required.
Condenser air flow restrictionRemove the cabinet, inspect the interior surface of the condenser. If restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush. Clean the interior base before re-assembling.
Condenser fins (damaged)If the condenser fins are closed over a large area on the coil surface, head pressures will increase, causing the compressor to cycle. Straighten the fins or replace the coil.
CapacitorTest the capacitor.
WiringCheck the terminals. If loose, repair or replace.
Refrigeration systemCheck the system for a restriction.
Insufficient coolingAir filterIf restricted, clean or replace.
Unit undersizedDetermine if the unit is properly sized for the area to be cooled.
Excessive noiseBlower or fanCheck the set screw, or clamp. If loose or miss- ing. correct. If the blower or fan is hitting scroll or barrier, rearrange the air handling parts.
Copper tubingRemove the cabinet and carefully rearrange the tubing not to contact the cabinet, compressor, shroud, and barrier.

Friedrich SS08 air conditioner troubleshooting

COMPLAINTCAUSESOLUTION
Unit does not operate.• The unit is turned to the off position, or the thermostat is satisfied.• Turn the unit to the on position and raise or lower temperature setting (as appropriate) to call for operation.
• The LCDI power cord is unplugged.• Plug into a properly grounded 3 prong receptacle. See “Electrical Rating Tables" on pg. 6 for the proper receptacle type for your unit.
• The LCDI power cord has tripped (Reset button has popped out).• Press and release RESET (listen for click: Reset button latches and remains in) to resume operation.
• The circuit breaker has tripped or the supply circuit fuse has blown.• Reset the circuit breaker, or replace the fuse as applicable. If the problem continues, contact a licensed electrician.
• There has been a local power failure.• The unit will resume normal operation once power has been restored.
Unit Trips Circuit Breaker or Blows Fuses.• Other appliances are being used on the same circuit.• The unit requires a dedicated outlet circuit, not shared with other appliances.
• An extension cord is being used.• Do NOT use an extension cord with this or any other air conditioner.
• The circuit breaker or time-delay fuse is not of the proper rating.• Replace with a circuit breaker or time-delay fuse of the proper rating. See “Electrical Rating Tables" on pg. 6 for the proper circuit breaker/fuse rating for your unit. If the problem continues, contact a licensed electrician.
LCDI Power Cord Trips (Reset Button Pops Out).• The LCDI power cord can trip (Reset button pops out) due to disturbances on your power supply line.• Press and release RESET (listen for click: Reset button latches and remains in) to resume normal operation.
• Electrical overioad, overheating, or cord pinching can trip (Reset button pops out) the LCDI power cord.• Once the problem has been determined and corrected, press and release RESET (listen for click: Reset button latches and remains in) to resume normal operation.
Unit Does Not Cool/Heat Room Sufficiently. Or Cycles On And Off Too Frequently.• The return/discharge air grille is blocked.• Ensure that the return and/or discharge air paths are not blocked by curtains, blinds, furniture, etc.
• Windows or doors to the outside are open.• Ensure that all windows and doors are closed.
• The temperature is not set at a cool enough/warm enough setting.• Adjust the Temperature control to a cooler or warmer setting as necessary.
• The filter is dirty or obstructed.• Clean the filter. (See Routine Maintenance), or remove obstruction.
• The indoor coil or outdoor coil is dirty or obstructed.• Clean the coils. (See Routine Maintenance), or remove obstruction.
• There is excessive heat or moisture (cooking, showers, etc.) in the room.• Be sure to use exhaust vent fans while cooking or bathing and. if possible, try not to use heat producing appliances during the hottest part of the day.
• The temperature of the room you are trying to cool is extremely hot.• Allow additional time for the air conditioner to cool off a very hot room.
Unit Does Not Cool/Heat Room Sufficiently, Or Cycles On And Off Too Frequently (continued).• The outside temperature is below 60° F (16® C).• Do not try to operate your air conditioner in the cooling mode when the outside temperature is below 60® F (16® C). The unit will not cool properly, and the unit may be damaged.
• The digital control is set to fan cycling mode.• Since the fan does not circulate the room air continuously at this setting, the room air does not mix as well and hot (or cold) spots may result. Using the continuous fan setting is recommended to obtain optimum comfort levels.
• The air conditioner has insufficient cooling capacity to match the heat gain of the room.• Check the cooling capacity of your unit to ensure it is properly sized for the room in which it is installed. Room air conditioners are not designed to cool multiple rooms.
• The air conditioner has insufficient heating capacity to match the heat loss of the room.• Check the heating capacity of your unit. Air conditioners are sized to meet the cooling load, and heater size is then selected to meet the heating load. In extreme northern climates, room air conditioners may not be able to be used as a primary source of heat.
Unit Runs Too Much.• This may be due to an excessive heat load in the room.• If there are heat producing appliances in use in the room, or if the room is heavily occupied, the unit will need to run longer to remove the additional heat.
• It may also be due to an improperly sized unit.• Be sure to use exhaust vent fans while cooking or bathing and, if possible, try not to use heat producing appliances during the hottest part of the day.
• This may be normal for higher efficiency (EER) air conditioners.• The use of higher efficiency components in your new air conditioner may result in the unit running longer than you feel it should. This may be more apparent, if it replaced an older, less efficient, model. The actual energy usage, however, will be significantly less when compared to older models.
• You may notice that the discharge air temperature of your new air conditioner may not seem as cold as you may be accustomed to from older units. This does not, however, indicate a reduction in the cooling capacity of the unit.• The energy efficiency ratio (EER) and cooling capacity rating (Btu/h) listed on the unit’s rating plate are both agency certified.

Friedrich ZoneAire P09A air conditioner troubleshooting

TroubleCheckAction
Air conditioner does not operateIs there power?
Is it plugged in?Push the plug into the wall socket
Is the fuse or circuit breaker switch off?Change the fuse or reset breaker
Is timer on?Pres TIMER button
Cooling efficiency is not goodIs air inlet or outlet blocked?Clear the air path
Is there any other heat source in the room?Move the unit away from heat source
Are air filters dirty?Clean the air filter
Is SET TEMP suitable?Set to a suitable temperature
Is indoor fan speed set at low?Set to a suitable fan speed
Too much noise and vibrationIs the sound part of the refrigeration cycle?The sound may be normal
Is unit leveled?Move unit to a level location
The machine starts and stops frequentlyIs the voltage of the power source correct and continuous?Repair the power source
Is the air exhaust bent?Try to keep the air exhaust horizontal

Friedrich ZStar ZQ05 air conditioner troubleshooting

ProblemPossible CausesWhat To Do §
Air conditioner does not start• The air conditioner is unplugged.• Make sure the air conditioner plug is pushed completely into the outlet.
• The fuse is blown/circuit breaker is tripped.• Check the house fuse/circuit breaker box and replace the fuse or reset the breaker.
• Power failure.• If power failure occurs, turn the mode control to Off. When power is restored, wait 3 minutes to restart the air conditioner to prevent tripping of the compressor overload.
Air conditioner does not cool as it should• Airflow is restricted.• Make sure there are no curtains, blinds, or furniture blocking the front of the air conditioner.
• The THERMOSTAT may not be set high enough.• Turn the knob to a higher setting. The highest setting provides maximum cooling.
• The air filter is dirty.• Clean the filter at least every 2 weeks. See the operating instructions section.
• The room may have been hot.• When the air conditioner is first turned on you need to allow time for the room to cool down.
• Cold air is escaping.• Check for open furnace floor registers and cold air returns.
• Set the air conditioner's vent to the closed position.
• Cooling coils have iced up.• See Air Conditioner Freezing Up below.
Air conditioner freezing up• Ice blocks the air flow and stops the air conditioner from cooling the room.• Set the mode control on high fan until the ice thaws out.