Lennox Mini Split Air Conditioner Heat Pump Error Codes





Need help finding Lennox mini split air conditioner error codes? Error codes can display on either the indoor or outdoor unit. Certain error codes mean different things. Knowing what each error code means can assist you in troubleshooting and fixing your Lennox AC unit. Below you will find Lennox AC error codes for both the indoor and outdoor units. We have included flowcharts for troubleshooting what part needs to be replaced. For any issues not covered on this page, here is the Lennox Owners website, and the Lennox Troubleshooting website. NOTE: Check your model number of Lennox AC before using the error codes as a reference.

Lennox Mini Split Air Conditioner Error CodesLennox Mini Split Air Conditioner Error Codes

Lennox mini-split heat pumps and air conditioners are ideal for heating and cooling spaces like add-on rooms where installing or extending ductwork is not possible. This is why many people choose to install a split system. All Lennox AC error codes that may show on your display are below.

Lennox MS8 SERIES AC Error Codes

Lennox Air Conditioner Error Code = C5 Indoor control jumper is missing









Lennox Air Conditioner Error Code = E0 EEPROM failure

Lennox Air Conditioner Error Code = EE EEPROM failure

Lennox Air Conditioner Error Code = E1 Communication failure between indoor unit and outdoor unit

Lennox Air Conditioner Error Code = E2 Indoor coil freeze protection – All system functions are terminated except indoor fan

Lennox Air Conditioner Error Code = E3 Outdoor coil blockage or low refrigerant due to leak

Lennox Air Conditioner Error Code = E4 Discharge line temperature protection

Lennox Air Conditioner Error Code = E5 Compressor overcurrent protection







Lennox Air Conditioner Error Code = E6 Communication failure between indoor unit and outdoor unit

Lennox Air Conditioner Error Code = FH Anti-freezing upper and lower limit range

Lennox Air Conditioner Error Code = FO Indoor coil is gathering refrigerant

Lennox Air Conditioner Error Code = F1 Indoor ambient sensor (RT1) open or short circuited

Lennox Air Conditioner Error Code = F2 Indoor coil sensor (RT2) open or short circuited

Lennox Air Conditioner Error Code = F3 Outdoor ambient sensor (RT4)open or short circuit

Lennox Air Conditioner Error Code = F4 Outdoor coil sensor (RT3) open or short circuit







Lennox Air Conditioner Error Code = F5 Discharge line sensor (RT5) error

Lennox Air Conditioner Error Code = F6 Compressor overload limit issue

Lennox Air Conditioner Error Code = F8 High current limit issue

Lennox Air Conditioner Error Code = F9 Discharge line temperature too high

Lennox Air Conditioner Error Code = HC Power factor correction protection

Lennox Air Conditioner Error Code = H1 Defrosting (heat pump only)

Lennox Air Conditioner Error Code = H3 Compressor overload protection sensor (CT1.2) malfunction

Lennox Air Conditioner Error Code = H4 Compressor high temperature protection







Lennox Air Conditioner Error Code = H5 Intelligent Power Module (IPM) module protection

Lennox Air Conditioner Error Code = H6 Indoor fan not communicating

Lennox Air Conditioner Error Code = LP Indoor and outdoor unit mismatch

Lennox Air Conditioner Error Code = L3 Outdoor DC fan motor malfunction

Lennox Air Conditioner Error Code = L9 Power factor protection

Lennox Air Conditioner Error Code = PH High voltage protection

Lennox Air Conditioner Error Code = PL Low voltage protection







Lennox MPA012S4S-1L AC Error Codes

Lennox Air Conditioner Error Code = EO Outdoor EEPROM error

Lennox Air Conditioner Error Code = E2 Communication error between outdoor unit and all indoor units

Lennox Air Conditioner Error Code = E3 Communication error between outdoor unit main control and IPM control

Lennox Air Conditioner Error Code = E4 Temp sensor error

Lennox Air Conditioner Error Code = E5 High or Low voltage protection

Lennox Air Conditioner Error Code = E8 Outdoor DC fan speed error

Lennox Air Conditioner Error Code = F1 Indoor unit #1 coil outlet temp, sensor error







Lennox Air Conditioner Error Code = F2 Indoor unit #2 coil outlet temp, sensor error

Lennox Air Conditioner Error Code = F3 Indoor unit #3 coil outlet temp, sensor error

Lennox Air Conditioner Error Code = F4 Indoor unit #4 coil outlet temp, sensor error

Lennox Air Conditioner Error Code = F5 Indoor unit #5 coil outlet temp, sensor error

Lennox Air Conditioner Error Code = F6 Indoor unit #6 coil outlet temp, sensor error

Lennox Air Conditioner Error Code = P1 High pressure switch open

Lennox Air Conditioner Error Code = P2 Low pressure switch open







Lennox Air Conditioner Error Code = P3 Outdoor Compressor current overload sensed

Lennox Air Conditioner Error Code = P4 High temperature sensed at compressor discharge line

Lennox Air Conditioner Error Code = P5 High temperature sensed at outdoor coil

Lennox Air Conditioner Error Code = Lpe Inverter module (IPM) error

Lennox Universal Mini-Split Error Codes

NOTE: All indoor units provide fault code information with either a digital LED display or with flash codes.
Lennox Air Conditioner Error Code = E0 Indoor unit EEPROM error

Lennox Air Conditioner Error Code = E1 Communication error between indoor unit and outdoor units

Lennox Air Conditioner Error Code = E3 Indoor fan speed error







Lennox Air Conditioner Error Code = E4 Indoor Return air temperature sensor error

Lennox Air Conditioner Error Code = E5 Indoor coil temperature sensor error

Lennox Air Conditioner Error Code = EC Low refrigerant

Lennox Air Conditioner Error Code = EE High water level alarm

Lennox Air Conditioner Error Code = F0 Outdoor current overload sensed

Lennox Air Conditioner Error Code = F1 Outdoor ambient temperature sensor error

Lennox Air Conditioner Error Code = F2 Outdoor coil temperature sensor error







Lennox Air Conditioner Error Code = F3 Compressor discharge temperature sensor error

Lennox Air Conditioner Error Code = F4 Outdoor unit EEPROM error

Lennox Air Conditioner Error Code = F5 Outdoor unit fan speed error

Lennox Air Conditioner Error Code = P0 Inverter module IPM error

Lennox Air Conditioner Error Code = P1 High or Low voltage protection

Lennox Air Conditioner Error Code = P3 Outdoor unit low temperature lockout

Lennox Air Conditioner Error Code = P4 Compressor drive error

Lennox Air Conditioner Error Code = P6 Compressor high-pressure or low-pressure switch open

(Indoor Unit Sticker Shown – ALL Indoor Units 09/24)

 

 

Lennox AC PartsLennox Air Conditioner Parts

 

Lennox AC Error Codes - Indoor Units 1Lennox AC Error Codes – Indoor Units 1

 

Lennox AC Error Codes - Indoor Units 2Lennox AC Error Codes – Indoor Units 2

 

 

Lennox AC Indoor Unit Error Fault Code E0

Lennox AC Indoor Unit Error Fault Code E0

 

 

Lennox AC Indoor Unit Error Fault Code E1Lennox AC Indoor Unit Error Fault Code E1

 

 

Lennox AC Indoor Unit Error Fault Code E3Lennox AC Indoor Unit Error Fault Code E3

 

 

Lennox AC Indoor Unit Error Fault Code E4Lennox AC Indoor Unit Error Fault Code E4

 

 

Lennox AC Indoor Unit Error Fault Code E5Lennox AC Indoor Unit Error Fault Code E5

 

 

Lennox AC Indoor Unit Error Fault Code ECLennox AC Indoor Unit Error Fault Code EC

 

 

Lennox AC Indoor Unit Error Fault Code F2

Lennox AC Indoor Unit Error Fault Code F2

 

 

Lennox AC Indoor Unit Error Fault Code F3Lennox AC Indoor Unit Error Fault Code F3

 

 

Lennox AC Indoor Unit Error Fault Code F4Lennox AC Indoor Unit Error Fault Code F4

 

 

Lennox AC Indoor Unit Error Fault Code F5Lennox AC Indoor Unit Error Fault Code F5

 

 

Lennox AC Main Board Error Codes LED Display 1Lennox AC Main Board Error Codes LED Display 1

 

 

 

Lennox AC Main Board Error Codes LED Display 2Lennox AC Main Board Error Codes LED Display 2

 

 

Lennox AC Main Board Fault Code LED 1Lennox AC Main Board Fault Code LED 1

 

 

Lennox AC Main Board Fault Code LED 3Lennox AC Main Board Fault Code LED 3

 

 

Lennox AC Main Board Fault Code LED 2

Lennox AC Main Board Fault Code LED 2

 

 

Lennox AC Main Board Fault Code LED 5Lennox AC Main Board Fault Code LED 5

 

 

Lennox AC Main Board Fault Code LED 6Lennox AC Main Board Fault Code LED 6

 

 

Lennox AC Fan Motor DC Voltage Input and OutputLennox AC Fan Motor DC Voltage Input and Output

 

 

Lennox AC Fan Motor TroubleshootingLennox AC Fan Motor Troubleshooting

Lennox MS8 SERIES Installation And Service Procedures: Manual for Indoor And Outdoor Error Codes

LENNOX SPLIT AIR CONDITIONER MANUAL IN PDF HERE.
For model numbers LI012CI-160P432, LI012CO-160P432, LI018CI-160P432, LI018CO-160P432, LI024CI-160P432, LI024CO-160P432, LI012HI-160P432, LI012HO-160P432, LI018HI-160P432, LI018HO-160P432, LI024HI-160P432 and LI024HO-160P432.

LENNOX MINI-SPLIT SYSTEMS SERVICE MANUAL
Lennox Mini-Split Service Manual PDF is here if further troubleshooting is needed.

LENNOX SERVICE MANUAL FOR ROOM AIR CONDITIONER (Inverter Split-Type) PDF is here.
Manual is applicable only to the following models – LNIV2610, LNIV3510, LNIV5010, LNIV6510.

If you need more schematics or ways to troubleshoot your Lennox AC unit, please leave a comment below and we will assist you.


More "Do It Yourself" Tips, Tricks, Ideas, Repair:


















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