Categories: Air Conditioner

Lennox air conditioner error codes

Lennox air conditioners provide codes of errors due to the presence of the self-diagnostics function. This option is present in the majority of modern air conditioners. It allows to detect a problem more quickly, using only operating instructions. In a number of cases, the user can remove a malfunction and start the system without calling specialists from a service center and having saved money and time on his own. You can find Error codes of Lennox air conditioners in the tables below.

Lennox LNIV2610 air error codes

Air conditioners Lennox LNIV2610 are room air conditioning equipment. They are of inverter split-type. There are indoor and outdoor units. Besides cooling and heating, some models can possess many useful function including ionizer function.

Display LED STATUS
EO EEPROM parameter error
E1 Indoor/outdoor units communication protection
E2 Zero-crossing signal error
E3 Indoor fan speed out of control
E5 Open or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error
E6 Open or short circuit of room or evaporator temperature sensor
E 7 Outdoor fan speed out of control
PO IBM malfunction or IGBT over-strong current protection
P1 Over voltage or too low voltage protection
P2 Temperature protection of compressor top
P4 Inverter compressor drive error


Lennox MPA012S4S-1L air error codes

Air conditioners Lennox MPA012S4S-1L are mini-split systems possessing DC inverter control. They include units of different types: MPA single zone condensing units, MPA multi-zone condensing units, M22A compact cassette units, MMDA ducted units, MWMA wall mounted units, MCFA ceiling/floor units. Usually, such products have seven-year limited warranty for their compressor and five year- limited warranty- for all other components.

DISPLAY OUTDOOR UNITERROR CODE DEFINITION
EO Outdoor EEPROM error
E2 Communication error between outdoor unit and all indoor units
E3 Communication error between outdoor unit main control and IPM control
E4 Temp, sensor error (outdoorcoil sensor, outdoor ambient sensor, compressor discharge sensor, indoor unit coil outlet temp, sensor)
E5 High or Low voltage protection
E8 Outdoor DC fan speed error
F1 Indoor unit#1 coil outlet temp, sensor error
F2 Indoor unit#2 coil outlet temp, sensor error
F3 Indoor unit#3 coil outlet temp, sensor error
F4 Indoor unit #4 coil outlet temp, sensor error
F5 Indoor unit#5 coil outlet temp, sensor error
F6 Indoor unit#6 coil outlet temp, sensor error
P1 High pressure switch open
P2 Low pressure switch open
P3 Outdoor Compressor current overload sensed
P4 High temperature sensed at compressor discharge line
P5 High temperature sensed at outdoor coil
Lpe Inverter module (IPM) error ^


Lennox MS8 SERIES air error codes

Air conditioners Lennox MS8 SERIES include from MS8 series to mini-split single-zone systems for cooling and heating. There are indoor and outdoor units. Remote control of air conditioners is available.

Display Yellow Red Green Error Description System Status Troubleshooting for Possible Causes
NONE 1 OFF OFF Compressor 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).
OFF 11 Frequency limiting module temperature All system functions are terminated except indoor fan. • Verify proper attachment of heat sink.
• Clean heat sink, if necessary.
NONE OFF 13 OFF Power issue Compressor speed automatically adjusted to match conditions. System power issue.
C5 OFF Indoor control jumper is missing (labeled JUMP) All system functions are terminated. • Check indoor control jumper con- nections and replace jumper, if missing.
EE 11 EEPROM failure • Replace outdoor control.
E2 3 Indoor coil freeze protection All 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.
E3 OFF 9 OFF Outdoor 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.
E4 7 OFF OFF Discharge 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. • Check for low refrigerant charge.
• Check for restricted refrigerant flow due to blocked capillary.
E5 5 OFF OFF Compressor 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.
E6 OFF OFF OFF Communication failure between indoor unit and outdoor unit All 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.
FH 4 Anti-freezing upper and lower limit range Compressor will run at reduced speed until temperature increases. • Wait for temperature to increase above 42.8°F (6°C). then recheck operation status.
FO OFF Indoor coil is gathering refrigerant All 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.
F1 Indoor ambient sensor (RT1)open or short circuited Cooling 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.
F2 OFF OFF OFF Indoor coil sensor (RT2) open or short circuited
F3 6 Outdoor ambient sensor (RT4)open or short circuit All 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.
F4 OFF 4 OFF Outdoor coil sensor (RT3) open or short circuit
F5 7 Discharge line sensor (RT5) error All 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.
F6 3 Compressor over- load limit issue Normal 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.
F8 OFF 1 OFF High current limit issue System 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.
F9 2 Discharge line temperature too high • Check discharge line temperature. Correct if to high.
HC 14 OFF Power factor correction protection System will continue to operate at reduce compressor speed until issue is corrected.
H1 2 Defrosting (heat pump troubleshooting) Normal operation Normal defrost operation.
H3 8 Compressor 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.
H4 6 OFF OFF Compressor 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.
H5 4 OFF OFF Intelligent Power Module (IPM) module protection This 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
H6 OFF OFF OFF Indoor fan not communicating All 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.
LP 16 OFF OFF Indoor and outdoor unit mismatch The two system components are mis-matched. Also, verify that the red jumper is in place on the indoor control board.
L3 OFF 14 OFF Outdoor 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.
L9 9 OFF OFF Power factor protection Indoor unit is experiencing either a high or low input voltage condition. • Verify proper input voltage at terminal strip N(1) and 3.
PH 13 OFF OFF High voltage protec- tion All 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.
PL 12 OFF OFF Low voltage protec- tion All 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.