Lennox Air Conditioner Error Code

Lennox LNIV2610 air error codes

DisplayLED STATUS
EOEEPROM parameter error
E1Indoor/outdoor units communication protection
E2Zero-crossing signal error
E3Indoor fan speed out of control
E5Open or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error
E6Open or short circuit of room or evaporator temperature sensor
E 7Outdoor fan speed out of control
POIBM malfunction or IGBT over-strong current protection
P1Over voltage or too low voltage protection
P2Temperature protection of compressor top
P4Inverter compressor drive error

Lennox MPA012S4S-1L air error codes


DISPLAYOUTDOOR UNITERROR CODE DEFINITION
EOOutdoor EEPROM error
E2Communication error between outdoor unit and all indoor units
E3Communication error between outdoor unit main control and IPM control
E4Temp, sensor error (outdoorcoil sensor, outdoor ambient sensor, compressor discharge sensor, indoor unit coil outlet temp, sensor)
E5High or Low voltage protection
E8Outdoor DC fan speed error
F1Indoor unit#1 coil outlet temp, sensor error
F2Indoor unit#2 coil outlet temp, sensor error
F3Indoor unit#3 coil outlet temp, sensor error
F4Indoor unit #4 coil outlet temp, sensor error
F5Indoor unit#5 coil outlet temp, sensor error
F6Indoor unit#6 coil outlet temp, sensor error
P1High pressure switch open
P2Low pressure switch open
P3Outdoor Compressor current overload sensed
P4High temperature sensed at compressor discharge line
P5High temperature sensed at outdoor coil
LpeInverter module (IPM) error ^

Lennox MS8 SERIES air error codes


DisplayYellowRedGreenError DescriptionSystem StatusTroubleshooting for Possible Causes
NONE1OFFOFFCompressor has an open circuit.All system functions are terminated except indoor fan.• Check connections between com- pressor and outdoor control (con- trol terminals are marked U, V and W).
NONEOFF11OFFFrequency limiting module temperatureAll system functions are terminated except indoor fan.• Verify proper attachment of heat sink.
• Clean heat sink, if necessary.
NONEOFF13OFFPower issueCompressor speed automatically adjusted to match conditions.System power issue.
C5OFFOFFOFFIndoor control jumper is missing (labeled JUMP)All system functions are terminated.• Check indoor control jumper con- nections and replace jumper, if missing.
EE11OFFOFFEEPROM failure• Replace outdoor control.
E23OFFOFFIndoor coil freeze protectionAll system functions are terminated except indoor fan. The indoor coil sensor (RT2) monitors the coil temperature continuously. If coil temperature drops below 30.2°F (-1°C). the compressor and the outdoor fan (30 seconds later) are switched off. Condition is cleared when indoor coil temperature rises above 42.8°F (6°C) and the compressor has been off for a minimum of three minutes.• Check for restricted indoor airflow and change filter, if necessary.
• Check for restricted refrigerant flow.
• Check for low outdoor ambient temperature or low indoor system load.
E3OFF9OFFOutdoor coil blockage or low refrigerant due to leak.All system functions are terminated except indoor fan.• Check for proper clearances around outdoor unit.
• Check outdoor coil for and clean, if necessary.
E47OFFOFFDischarge line temperature protection
Sensor RT5 monitors compressor discharge line temperature and communicates with outdoor unit microprocessor. Depending on the temperature measured, the compressor speed will be increased to meet the load or will continue to run at the existing speed. If the temperature becomes excessively high, the compressor will be de-energized. When the compressor discharge temperature drops below 1&4°F (90°C). the unit will resume normal operation. See unit information manual for further information.• Check for low refrigerant charge.
• Check for restricted refrigerant flow due to blocked capillary.
E55OFFOFFCompressor over-current protection
All system functions are terminated except indoor fan.• Check for locked compressor rotor due to excessively high ambient temperature.
• Check for restricted refrigerant flow due to blocked capillary tubing.
• Check outdoor unit to make sure that coil is not blocked.
E6OFFOFFOFFCommunication failure between indoor unit and outdoor unitAll system functions are terminated after three-minute delay except indoor fan.• If error is displayed on outdoor unit, check communications cable / wire at indoor and outdoor controls to verify proper connection. See unit information manual for further information.
FHOFF4OFFAnti-freezing upper and lower limit rangeCompressor will run at reduced speed until temperature increases.• Wait for temperature to increase above 42.8°F (6°C). then recheck operation status.
FOOFFOFFOFFIndoor coil is gathering refrigerantAll system functions are terminated except indoor fan.• Pump refrigerant into outdoor unit Check 2-way shut-off valve in small line to see if it is closed or if flow is restricted. Correct, if necessary.
F1OFFOFFOFFIndoor ambient sensor (RT1)open or short circuitedCooling and dehumidification modes will continue to operate as well as indoor fan. Unit will not operate in heating mode.• Check sensor to ensure that it is in acceptable range.
• Check sensor for proper resistance.
• Replace sensor if shorted, open or out-of-calibration.
F2OFFOFFOFFIndoor coil sensor (RT2) open or short circuited
F3OFF6OFFOutdoor ambient sensor (RT4)open or short circuitAll system functions are terminated except indoor fan.• Check sensor to ensure that it is in acceptable range.
• Check sensor for proper resistance.
• Replace sensor if shorted, open or out-of-calibration.
F4OFF4OFFOutdoor coil sensor (RT3) open or short circuit
F5OFF7OFFDischarge line sensor (RT5) errorAll system functions will continue to run for 3 minutes, then terminate. Indoor fan will continue to run.• Check sensor for proper resistance. Sensor should be in acceptable range. Replace sensor if shorted, open or out-of-calibration.
F6OFF3OFFCompressor over- load limit issueNormal operational state with compressor speed automatically adjust for operational conditions. System will continue to operation at reduced compressor speed until issue is corrected.• Check outdoor ambient air temperature. Could be too high.
• Check for locked compressor rotor.
• Check for blocked refrigeration circuit (capillary tubes for example).
• Check for blocked or restricted outdoor air flow. Clear, if necessary.
• Check for low refrigerant charge.
F8OFF1OFFHigh current limit issueSystem will continue to operate at reduce compressor speed until issue is corrected.• Check for low or high input voltage. Correct if necessary. Could be too high.
F9OFF2OFFDischarge line temperature too high• Check discharge line temperature. Correct if to high.
HC14OFFOFFPower factor correction protection
System will continue to operate at reduce compressor speed until issue is corrected.See unit information manual for fur- ther information.
H12OFFOFFDefrosting (heat pump only)Normal operationNormal defrost operation.
H38OFFOFFCompressor overload protection sensor (CT1.2) malfunction.All system functions are terminated except indoor fan.• Check for proper wiring connec- tions and loose wires at outdoor control (CT1,2) input plug.
• Check for continuity across over- load protection sensor terminals mounted at top of compressor.
H46OFFOFFCompressor high temperature protection
All system functions are terminated except indoor fan.• Check for proper wiring connec- tions and loose wires at outdoor control (CT1, 2) input plug.
• Check for continuity across over- load protection sensor terminals mounted at top of compressor.
H54OFFOFFIntelligent Power Module (IPM) module protectionThis can be caused by any of the fol- lowing:
• Loss of cooling to the heat sink
• Low voltage.
• High ambient temperature
• Loose screws fastening the outdoor control to the heat sink
See unit information manual for further information.
H6OFFOFFOFFIndoor fan not communicatingAll system functions are terminated.Possible Indoor control failure or in- door motor failure.
• Check wiring between fan motor and indoor control.
• Check wiring between fan motor and terminal marked OF FAN.
• Replace one or both, if necessary.
LP16OFFOFFIndoor and outdoor unit mismatchThe two system components are mis-matched. Refer to engineering handbook for correct match-up. Also, verify that the red jumper is in place on the indoor control board.
L3OFF14OFFOutdoor DC fan motor malfunction• Check wiring between fan motor and outdoor control terminal marked OF FAN.
• If wiring is correct, replace outdoor DC fan motor.
L99OFFOFFPower factor protectionIndoor unit is experiencing either a high or low input voltage condition. • Verify proper input voltage at terminal strip N(1) and 3.
PH13OFFOFFHigh voltage protec- tionAll system functions are terminated.• Check input voltage on outdoor unit terminal strip (N and L terminals).
• If voltage is higher than 265VAC. disconnect power to unit Correct input voltage problem before reap- plying power to system.
• If voltage is below 265VAC. then check capacitor while unit is turned off.
• If voltage is between 200-208V. ca- pacitor is working properly
• If voltage is some other value, re- place capacitor.
• If input voltage and capaator are normal, replace outdoor control.
PL12OFFOFFLow voltage protec- tionAll system functions are terminated.• Check input voltage on outdoor unit terminal strip (N and L terminals).
• If voltage is lower than 150VAC. restart system and check power again.
•9-12 kBtu. 208-230VAC systems only Check reactor (choke) line connection on outdoor control terminal marked AC-L2.