Rheem air conditioner troubleshooting

Even reliable air conditioners Rheem can break down as any other complex appliances. At the same time in the initial stage the cause of a breakdown of them must be revealed and only then one must refer to a service center. Rheem air conditioner troubleshooting system is serving precisely for this purpose.

SYMPTOMPOSSIBLE CAUSEREMEDY
Unit will not run• Power off or loose electrical connection
• Thermostat out of calibration-set too high
• Defective contactor
• Blown fuses / tripped breaker
• Transformer defective
• High pressure control open (if provided)
• Check for correct voltage at contactor in condensing unit
• Reset
• Check for 24 volts at contactor coil - replace if contacts are
open
• Replace fuses / reset breaker
• Check wiring-replace transformer
• Reset-also see high head pressure remedy-The high pressure
control opens at 450 PSIG
Outdoor fan runs, compressor
doesn't
• Run or start capacitor defective
• Start relay defective
• Loose connection
• Compressor stuck, grounded or open motor winding,
open internal overload.
• Low voltage condition
• Replace
• Replace
• Check for correct voltage at compressor -
check & tighten all connections
• Wait at least 2 hours for overload to reset.
If still open, replace the compressor.
• Add start kit components
Insufficient cooling• Improperly sized unit
• Improper indoor airflow
• Incorrect refrigerant charge
• Air, non-condensibles or moisture in system
• Recalculate load
• Check - should be approximately 400 CFM per ton.
• Charge per procedure attached to unit service panel
• Recover refrigerant, evacuate & recharge, add filter drier
Compressor short cycles• Incorrect voltage
• Defective overload protector
• Refrigerant undercharge
• At compressor terminals, voltage must be ± 10% of
nameplate marking when unit is operating.
• Replace - check for correct voltage
• Add refrigerant
Registers sweat• Low indoor airflow• Increase speed of blower or reduce restriction - replace air
filter
High head-low vapor pressures• Restriction in liquid line, expansion device or filter drier
• Flowcheck piston size too small
• Incorrect capillary tubes
• Remove or replace defective component
• Change to correct size piston
• Change coil assembly
High head-high or normal vapor
pressure - Cooling mode
• Dirty outdoor coil
• Refrigerant overcharge
• Outdoor fan not running
• Air or non-condensibles in system
• Clean coil
• Correct system charge
• Repair or replace
• Recover refrigerant, evacuate & recharge
Low head-high vapor pressures• Flowcheck piston size too large
• Defective Compressor valves
• Incorrect capillary tubes
• Change to correct size piston
• Replace compressor
• Replace coil assembly
Low vapor - cool compressor -
iced indoor coil
• Low indoor airflow
• Operating below 65°F outdoors
• Moisture in system
• Increase speed of blower or reduce restriction - replace air
filter
• Add Low Ambient Kit
• Recover refrigerant - evacuate & recharge - add filter drier
High vapor pressure• Excessive load
• Defective compressor
• Recheck load calculation
• Replace
Fluctuating head & vapor
pressures
• TXV hunting
• Air or non-condensibles in system
• Check TXV bulb clamp - check air distribution on coil - replace
TXV
• Recover refrigerant, evacuate & recharge
Gurgle or pulsing noise at
expansion device or liquid line
• Air or non-condensibles in system• Recover refrigerant, evacuate & recharge
Compressor runs, ECM
outdoor fan doesn't
• 24VAC signal not present at yellow fan wire
• Common signal not present at blue fan wire
• Check for correct thermostat connections
• Verify blue fan wire is connected to the common side

Rheem air conditioner troubleshooting

Status and Diagnostic Description


7 -Segment
Display Code
Diagnostic DescriptionStatus / Possible Cause -Troubleshooting
Information
0StandbyStandby - No call for operation
cY1First Stage or Single Stage Unit Operation
CY2Second stage unit operation
(2-stage unit only)
c or
C Flashing
Anti-Short Cycle Timer (3 minutes) or
Minimum Run Timer (30 seconds)
Waiting for anti-short cycle timer to expire
Waiting for minimum run timer to expire
FICC Board Fuse Open1. Low voltage wiring damage or miswired
1 (*)Compressor Running Extremely Long Run
Cycle (Cooling mode only)
1. Low refrigerant charge
2. Air ducts have substantial leakage
3. Check thermostat operation
4. Dirty filter
5. Dirty outdoor coil
2 (*)Pressure Control Trip (L terminal output only)1. (See faults 21, L21, 23, L23)
21 (***)Low Pressure Control Trip
Note: Low-pressure control is ignored for 90
seconds after call for unit operation.
Active Protection – The ICC will try to
restart the unit after the pressure control
automatically re-closes.
Unit will try to restart 3 times in the same
thermostat call for operation (Y1) before
lockout (fault L21)
1. Unit is low on refrigerant charge
2. Indoor coil is frozen (cooling mode)
3. Dirty indoor coil or filter (cooling mode)
4. Indoor blower is not running (cooling mode)
5. TEV is not operating correctly
L21 (**)Lockout - Low Pressure Control Trip (**)LPC tripped three consecutive times in same
thermostat call
23 (***)High Pressure Control Trip
Active Protection – The ICC will try to
restart the unit after the pressure control
automatically re-closes.
Unit will try to restart 3 times in the same
thermostat call for operation (Y1) before
lockout (fault L23)
1. Outdoor coil is dirty (cooling mode)
4
2. Outdoor fan is not running (cooling mode)
3. Dirty indoor coil or filter (heat pump mode)
4. Liquid line restriction (filter drier blocked, etc.)
5. Excessive refrigerant charge
L23 (**)Lockout - High Pressure Control Trip (**)HPC tripped three consecutive times in same
thermostat call
25Outdoor Ambient Temperature Sensor1. ICC board sensor damaged (ICC
will continue to operate)
27Abnormal Low Line or No Line Voltage
(See unit nameplate for operating voltage)
1. Check incoming line voltage to the disconnect
and unit
2. Check wiring connections
28Abnormal High Line Voltage1. Check line voltage
3 (*)Short Cycling1. Check thermostat for intermittent demand
signal
2. Check thermostat location in zone (too close to
discharge grill)
5 (*) (***)Compressor will not run
Active Protection – After detecting compressor
will not run the ICC control will shut the unit
down. The control will try to restart the unit
every 5 minutes for 4 tries. After that, the ICC
will attempt a restart every 20 minutes up to 6
hours.
1. Check for damaged, miswired, or wrong run
capacitor
2. Check for damaged or miswired start capacitor
and relay
3. Check voltage levels at ICC board and
compressor
4. Check for broken wires, loose connectors, or
miswired
5. Check compressor motor windings for
continuity
6. Check for open compressor internal protector
7. Check for excessive liquid refrigerant in
compressor
L5 (**)Lockout – Check Compressor (**)After 6 hours of attempted unit restart ICC control
-ICC Board Mis-operation1. Check ICC board compressor relay
8 (*)ICC Board Mis-operation (L terminal
output only)
1. Check ICC board compressor relay
9 (*)ICC Secondary Voltage Low
(Less than 18V)
1. Check transformer for miswiring or
overloading.

(*) – Indicates flash code will be an output on the ICC “L” terminal to the indoor
thermostat “L” terminal. Unless a diagnostic/fault is manually cleared by cycling
power or pressing the TEST button the flash code will continue at the L terminal for
up to 20 seconds after the start of a successful call for unit operation.
L Terminal Output
• Flash 1 – Compressor running extremely long run cycle
• Flash 2 – Low or High pressure control trip
• Flash 3 – Unit short cycling
• Flash 5 – Compressor will not run
• Flash 8 – Control mis-operation
• Flash 9 – Low control voltage
(**) – Lockout modes are reset by either cycling line voltage, low voltage, or by
pressing control TEST button for 1 second. The control will attempt to start the unit
when the TEST button is pressed and released.
(***) – Caution: Indicates Active Protection. Unit will attempt to restart auto-
matically.

Rheem ARL-JEZ 16 Seer Series Air Conditioner Troubleshooting

SYMPTOMS POSSIBLE CAUSE CHECK/REMEDIES
COMPRESSOR OVERHEATING
High superheatLow chargeCheck system charge
Faulty metering deviceRestricted cap tube, TEV (TXV)
Power element superheat adjustment
Foreign matter stopping flow
High internal loadHot air (attic) entering return
Heat source on; mis-wired or faulty control
Restriction in liquid lineDrier plugged
Line kinked
Low head pressureLow charge
Operating in low ambient temperatures
Suction or liquid line subjected to high heat sourceHot attic
Hot water line
Low voltageLoose wire connectionsCheck wiring
Power company problem, transformerHave problem corrected before diagnosis continues
Undersized wire feeding unitCorrect and complete diagnosis
High voltagePower company problemHave problem corrected
High head pressureOverchargeCheck system charge
Dirty heat pump coilClean coil
Faulty or wrong size heat pump fan motorReplace fan motor
Faulty fan blade or wrong rotationReplace fan blade
Replace with correct rotation motor
Recirculation of airCorrect installation
Additional Heat SourceCheck for dryer vent near unit
Check for recirculation from other equipment
Non-condensableRecover refrigerant, Evacuate and recharge system
Equipment not matchedCorrect mis-match
Short cycling of compressorFaulty pressure controlReplace pressure control
Loose wiringCheck unit wiring
ThermostatLocated in supply air stream
Differential setting too close
Customer misuse
TEVInternal foreign matter
Power element failure
Valve too small
Distributor tube/tubes restricted
Short cycling of compressor (cont.)Low chargeCheck system charge
Low evaporator air flowDirty roil
Dirty filter
Duct too small or restricted
Faulty run capacitorReplace
Faulty internal overloadReplace compressor
ELECTRICAL (See Control Diagnostics)
No voltage on line side of control boardBlown fuses or tripped circuit breakerCheck for short in wiring or unit
Improper wiringRe-check wiring diagram
Improper voltageHigh voltageWrong unit
Power supply problem
Low voltageWrong unit
Power supply problem
Wiring undersized
Loose connections
CONTAMINATION
MoisturePoor evacuation on installation or during serviceIn each case, the cure is the same. Recover refrigerant. Add filter drier, evacuate and re-charge
High head pressureNon-condensable air
Unusual head and suction readingsWrong refrigerant
Foreign Matter- copper filingsCopper tubing cuttings
Copper oxideDirty copper piping
Welding scaleNitrogen not used
Soldering fluxAdding flux before seating copper part way
Excess soft solderWrong solder material
LOSS OF LUBRICATION
Compressor failuresLine tubing too longAdd oil to the recommended level
Line tubing too largeReduce pipe size to improve oil return
Low suction pressureLow chargeCheck system charge
Refrigerant leaksRepair and recharge
Cold, Noisy compressor - SluggingDilution of Oil with RefrigerantObserve piping guidelines
Noisy compressorMigrationCheck crankcase heater
Cold, sweating compressorFloodingCheck system charge
Low LoadReduced air flowDirty filter
Dirty coil
Wrong duct size
Restricted duct
Thermostat settingAdvise customer
Short cycling of compressorFaulty pressure controlReplace control
Loose wiringCheck all control wires
ThermostatIn supply air stream, out of calibration,
Customer misuse
FLOODED STARTS
Liquid in the compressor shellFaulty or missing crankcase heaterReplace crankcase heater
Too much liquid in systemIncorrect pipingCheck Piping guidelines
OverchargeCheck and adjust charge
SLUGGING
On start upIncorrect pipingReview pipe size guidelines
TEV hunting when runningOversized TEVCheck TEV application
FLOODING
Poor system control using a TEVLoose sensing bulbSecure the bulb and insulate
Bulb in wrong locationRelocate bulb
Wrong size TEVUse correct replacement
Improper superheat settingAdjust, if possible; Replace, if not
THERMOSTATIC EXPANSION VALVES
High Superheat, Low Suction PressureMoisture freezing and blocking valveRecover charge, install filter-drier, evacuate system, recharge
Dirt or foreign material blocking valveRecover charge, install filter-drier, evacuate system, recharge
Low refrigerant chargeCorrect the charge
Vapor bubbles in liquid lineRemove restriction in liquid line Correct the refrigerant charge
Remove non-condensible gases
Size liquid line correctly
Misapplication of internally equalized valveUse correct TEV
Plugged external equalizer lineRemove external equalizer line restriction
Undersized TEVReplace with correct valve
Loss of charge from power head sensing bulbReplace power head or complete TEV
Charge migration from sensing bulb to power head (Warm power head with warm, wet doth. Does valve operate correctly now?)Ensure TEV is warmer than sensing bulb
Improper superheat adjustment (Only applicable to TEV with adjustable superheat settings)Adjust superheat setting counter- clockwise
Valve feeds too much refrigerant, with low superheat and higher than mal suction pressureMoisture causing valve to stick open.Recover refrigerant, replace filter- drier, evacuate system and then nor- recharge
Dirt or foreign material causing valve to stick openRecover refrigerant, replace filter- drier, evacuate system and recharge
TEV seat leak (A gurgling or hissing sound is heard AT THE TEV during the off cycle, if this is the cause.) NOT APPLICABLE TO BLEED PORT VALVES.Replace the TEV
Oversized TEVInstall correct TEV
Incorrect sensing bulb locationInstall bulb with two mounting straps, in 2:00 or 4:00 position on suction line, with insulation
Low superheat adjustment (only applicable to TEV with adjustable superheat setting)Turn superheat adjustment clockwise
Incorrectly installed, or restricted external equalizer lineRemove restriction, or relocate external equalizer
Compressor flood back upon start upRefrigerant drainage from flooded evaporatorInstall trap riser to the top of the evaporator coil
Compressor in cold locationInstall crankcase heater on compressor
THERMOSTATIC EXPANSION VALVES
Superheat is low to normal with low suction pressureUnequal evaporator circuit loadingEnsure air flow is equally distributed through evaporator
Check for blocked distributor tubes
Low load or airflow entering evaporator coilEnsure blower is moving proper air CFM
Remove/Correct any air flow restriction
Superheat and suction pressure fluctuate (valve is hunting)Expansion valve is oversizedInstall correct TEV
Sensing bulb is affected by liquid refrigerant or refrigerant oil flowing through suction lineRelocate sensing bulb in another position around the circumference of the suction line
Unequal refrigerant flow through evaporator circuitsEnsure proper distributor piston is inserted in RCBA or RCHA coil
Ensure sensing bulb is located properly
Check for blocked distributor tubes
Improper superheat adjustment (only possible with TEV having superheat adjustment)Replace TEV or adjust superheat
Moisture freezing and partially blocking TEVRecover refrigerant, change filter- drier, evacuate system and recharge
Valve does not regulate at allExternal equalizer line not connected or line pluggedConnect equalizer line in proper location, or remove any blockage
Sensing bulb lost its operating chargeReplace TEV
Valve body damaged during soldering or by improper installationReplace TEV

Rheem B060CK Air Conditioner Troubleshooting

SYMPTOMPOSSIBLE CAUSEREMEDY
Unit will not run• Power off or loose electrical connection• Check for correct voltage at compressor contactor in control box
• Thermostat out of calibration-set too high• Reset
• Defective contactor• Check for 24 volts at contactor coil - replace if contacts are open
• Blown fuses• Replace fuses
• Transformer defective• Check wiring-replace transformer
• High pressure control open (if provided)• Reset-also see high head pressure remedy-
• Interconnecting low voltage wiring damaged• Replace thermostat wiring
Condenser fan runs, compressor doesn’t• Run capacitor defective (single phase only)• Replace
• Loose connection• Check for correct voltage at compressor - check & tighten all connections
• Compressor stuck, grounded or open motor winding open internal overload.• Wait at least 2 hours for overload to reset. If still open, replace the compressor. At compressor terminals, voltage must be within 10% of rating plate volts when unit is operating.
• Low voltage condition
Insufficient cooling• Improperly sized unit• Recalculate load
• Improper airflow• Check - should be approximately 400 CFM per ton.
• Incorrect refrigerant charge• Charge per procedure attached to unit service panel.
• Air, non-condensibles or moisture in system• Recover refrigerant, evacuate & recharge, add filter drier
• Incorrect voltage• At compressor terminals, voltage must be within 10% of rating plate volts when unit is operating.
Compressor short cycles• Incorrect voltage• At compressor terminals, voltage must be ± 10% of nameplate marking when unit is operating.
• Defective overload protector• Replace - check for correct voltage
• Refrigerant undercharge• Add refrigerant
Registers sweat• Low evaporator airflow• Increase speed of blower or reduce restriction - replace air filter
High head-low vapor pressures• Restriction in liquid line, expansion device or filter drier• Remove or replace defective component
• Flow check piston size too small• Change to correct size piston
• Incorrect capillary tubes• Change coil assembly
• TXV does not open• Replace TXV
High head-high or normal vapor pressure - Cooling mode• Dirty condenser coil• Clean coil
• Refrigerant overcharge• Correct system charge
• Condenser fan not running• Repair or replace
• Air or non-condensibles in system• Recover refrigerant, evacuate & recharge
High head-high or normal vapor pressure - Heating mode• Low air flow - condenser coil• Check filters - correct to speed
• Refrigerant overcharge• Correct system charge
• Air or non-condensibles in system• Recover refrigerant, evacuate & recharge
• Dirty condenser coil• Check filter - clean coil
Low head-high vapor pressures• Defective Compressor valves• Replace compressor
Low vapor - cool compressor - iced evaporator coil• Low evaporator airflow• Increase speed of blower or reduce restriction - replace air filter
• Operating below 65°F outdoors• Add Low Ambient Kit
• Moisture in system• Recover refrigerant - evacuate & recharge - add filter drier
• TXV limiting refrigerant flow• Replace TXV
High vapor pressure• Excessive load• Recheck load calculation
• Defective compressor• Replace
Fluctuating head & vapor pressures• TXV hunting• Check TXV bulb clamp - check air distribution on coil - replace TXV
• Air or non-condensibles in system• Recover refrigerant, evacuate & recharge
Gurgle or pulsing noise at expansion device or liquid line• Air or non-condensibles in system• Recover refrigerant, evacuate & recharge

Rheem RHWB-04WMP36A Air Conditioner Troubleshooting

SymptomPossible CauseRemedy
Unit will not runPower off or loosen electrical connectionCheck for correct voltage at control
Thermostat out of calibration - set too highCheck for correct voltage at control
Call for domestic hot water - air handler disabled until call ends. Unit is operating as designed.Unit is operating as designed
Blown fuses / tripped breakerReplace fuses / reset breaker
Transformer defectiveCheck wiring-replace transformer
Insufficient heatingImproperly sized air handler or water heaterRecalculate load
Improper indoor air flowCheck motor speed tap setting
Pump does not runCall for domestic hot water-air handler disabled until call ends. Unit is operating as designed.Unit is operating as designed
Power off or loosen electrical connectionCheck line voltage at pump
Check wires and connectors
Check pump capacitor
Blower does not runCall for domestic hot water - air handler disabled until call ends. Unit is operating as designed.Unit is operating as designed
Power off or loosen electrical connectionCheck line voltage at blower motor
Check wires and connectors
Check blower motor capacitor
Water does not flowWater lines are air lockedPurge air from lines