Honeywell
Honeywell Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Portable or window Honeywell air conditioner stops cooling and displays E1 on the control panel.
Room Temperature Sensor (Thermistor) Fault
E2
Honeywell portable air conditioner shows E2 and will not cool or respond to temperature changes properly.
Evaporator Coil Temperature Sensor Fault
E3
Honeywell air conditioner displays E3 and compressor will not start or stops shortly after starting.
Condenser Coil Temperature Sensor Fault
E4
Portable Honeywell AC shows E4 and stops cooling; unit may beep and shut down.
Full Condensate Tank / Water Level Fault
E5
Honeywell air conditioner displays E5 and may shut down or fail to start cooling.
Overcurrent / Overload Protection or Voltage Error
E6
Honeywell AC shows E6 and may not respond correctly to remote or control inputs.
Communication Error Between Display Board and Main Control Board
E7
Honeywell air conditioner displays E7 and may not operate in certain modes.
Mode Control or EEPROM Configuration Error
E8
Honeywell portable AC shows E8 and shuts down or runs only briefly.
High Temperature / Overheat Protection
E9
Honeywell AC displays E9 and may stop cooling or shut down unexpectedly.
Low Refrigerant / Refrigeration System Protection Fault (Model-Dependent)
F0
Honeywell portable AC shows F0 and stops cooling; fan may still run.
Low Refrigerant or Refrigeration System Fault (Alternate Code)
F1
Honeywell AC displays F1 and does not respond correctly to temperature settings.
Indoor Ambient Temperature Sensor Error (Alternate Code)
F2
Honeywell AC shows F2 and may shut down cooling unexpectedly.
Evaporator Coil Sensor Error (Alternate Code)
F3
Honeywell AC displays F3 and may not cool efficiently or may shut down.
Condenser Coil Sensor Error (Alternate Code)
F4
Honeywell AC shows F4 and may not operate in heat or cool mode (for heat pump models).
Outdoor / Discharge Temperature Sensor Error (Heat Pump Models)
F5
Honeywell AC displays F5 and may not respond to remote control or Wi‑Fi commands.
Communication / Wi‑Fi Module Error
H1
Honeywell heat pump air conditioner shows H1 and does not start heating immediately.
Defrost or Preheat Mode Indication
H3
Honeywell AC/heat pump displays H3 and shuts down heating or cooling.
Compressor Overload Protection / High Temperature Trip
H6
Honeywell split or window AC shows H6 and indoor fan does not run.
Indoor Fan Motor Fault
HI
Honeywell AC displays HI instead of a temperature and may run continuously.
High Temperature Indication / Sensor Reading Above Range
LC
Honeywell AC displays LC and buttons may not respond.
Child Lock / Panel Lock Activated
LO
Honeywell AC displays LO instead of a temperature and may not cool.
Low Temperature Protection / Sensor Reading Below Range
P1
Honeywell portable AC shows P1 and stops cooling; unit may beep.
Bottom Tray Full / Condensate Tank High Level
P2
Honeywell portable AC shows P2 and may stop cooling or dehumidifying.
Upper Water Tank Full / Condensate Level Error (Model-Dependent)
Symptom
Air conditioner does not turn on at all; no lights or display.
No Power / Dead Unit
Symptom
Air conditioner runs but does not cool the room effectively; air from the outlet is only slightly cool.
Reduced Cooling Capacity / Poor Heat Exchange
Symptom
Burning or electrical smell from the unit during operation.
Overheating Electrical Component
Symptom
Display and lights work, but none of the buttons respond to presses.
Keypad / Touch Panel Failure
Symptom
Frost or ice forming on the evaporator coil or front grille.
Evaporator Coil Icing
Symptom
High-pitched squealing or grinding noise from the indoor unit.
Indoor Fan Motor or Blower Bearing Failure
Symptom
Loud rattling or vibrating noise during operation, especially when compressor starts.
Excessive Vibration / Loose Components
Symptom
Musty or moldy odor from the air conditioner when it starts.
Biological Growth on Evaporator and Drain Pan
Symptom
Outdoor or exhaust fan is not running; unit overheats or shuts down.
Condenser Fan Failure
Symptom
Remote control does not operate the air conditioner, but the unit works from the panel.
Remote Control or IR Receiver Failure
Symptom
Unit blows warm air in cooling mode even though compressor appears to run.
Refrigerant Flow or Reversing Valve Issue (Heat Pump Models)
Symptom
Unit frequently turns on and off (short cycling) without reaching the set temperature.
Short Cycling / Improper Control
Symptom
Unit powers on but compressor does not start; only the fan runs and air is not cold.
Compressor Start Failure
Symptom
Unit runs in dehumidify mode but produces little or no water.
Ineffective Dehumidification
Symptom
Unit shuts off after a few minutes and will not restart until some time has passed.
Thermal Overload / Overheating Protection
Symptom
Unit trips the household circuit breaker or blows a fuse when starting.
High Inrush Current / Electrical Short
Symptom
Water leaking from the front or sides of the unit onto the floor.
Condensate Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Portable or window Honeywell air conditioner stops cooling and displays E1 on the control panel.
|
Room Temperature Sensor (Thermistor) Fault | View Details |
| E2 |
Honeywell portable air conditioner shows E2 and will not cool or respond to temperature changes properly.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Honeywell air conditioner displays E3 and compressor will not start or stops shortly after starting.
|
Condenser Coil Temperature Sensor Fault | View Details |
| E4 |
Portable Honeywell AC shows E4 and stops cooling; unit may beep and shut down.
|
Full Condensate Tank / Water Level Fault | View Details |
| E5 |
Honeywell air conditioner displays E5 and may shut down or fail to start cooling.
|
Overcurrent / Overload Protection or Voltage Error | View Details |
| E6 |
Honeywell AC shows E6 and may not respond correctly to remote or control inputs.
|
Communication Error Between Display Board and Main Control Board | View Details |
| E7 |
Honeywell air conditioner displays E7 and may not operate in certain modes.
|
Mode Control or EEPROM Configuration Error | View Details |
| E8 |
Honeywell portable AC shows E8 and shuts down or runs only briefly.
|
High Temperature / Overheat Protection | View Details |
| E9 |
Honeywell AC displays E9 and may stop cooling or shut down unexpectedly.
|
Low Refrigerant / Refrigeration System Protection Fault (Model-Dependent) | View Details |
| F0 |
Honeywell portable AC shows F0 and stops cooling; fan may still run.
|
Low Refrigerant or Refrigeration System Fault (Alternate Code) | View Details |
| F1 |
Honeywell AC displays F1 and does not respond correctly to temperature settings.
|
Indoor Ambient Temperature Sensor Error (Alternate Code) | View Details |
| F2 |
Honeywell AC shows F2 and may shut down cooling unexpectedly.
|
Evaporator Coil Sensor Error (Alternate Code) | View Details |
| F3 |
Honeywell AC displays F3 and may not cool efficiently or may shut down.
|
Condenser Coil Sensor Error (Alternate Code) | View Details |
| F4 |
Honeywell AC shows F4 and may not operate in heat or cool mode (for heat pump models).
|
Outdoor / Discharge Temperature Sensor Error (Heat Pump Models) | View Details |
| F5 |
Honeywell AC displays F5 and may not respond to remote control or Wi‑Fi commands.
|
Communication / Wi‑Fi Module Error | View Details |
| H1 |
Honeywell heat pump air conditioner shows H1 and does not start heating immediately.
|
Defrost or Preheat Mode Indication | View Details |
| H3 |
Honeywell AC/heat pump displays H3 and shuts down heating or cooling.
|
Compressor Overload Protection / High Temperature Trip | View Details |
| H6 |
Honeywell split or window AC shows H6 and indoor fan does not run.
|
Indoor Fan Motor Fault | View Details |
| HI |
Honeywell AC displays HI instead of a temperature and may run continuously.
|
High Temperature Indication / Sensor Reading Above Range | View Details |
| LC |
Honeywell AC displays LC and buttons may not respond.
|
Child Lock / Panel Lock Activated | View Details |
| LO |
Honeywell AC displays LO instead of a temperature and may not cool.
|
Low Temperature Protection / Sensor Reading Below Range | View Details |
| P1 |
Honeywell portable AC shows P1 and stops cooling; unit may beep.
|
Bottom Tray Full / Condensate Tank High Level | View Details |
| P2 |
Honeywell portable AC shows P2 and may stop cooling or dehumidifying.
|
Upper Water Tank Full / Condensate Level Error (Model-Dependent) | View Details |
| – |
Air conditioner does not turn on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Air conditioner runs but does not cool the room effectively; air from the outlet is only slightly cool.
|
Reduced Cooling Capacity / Poor Heat Exchange | View Details |
| – |
Burning or electrical smell from the unit during operation.
|
Overheating Electrical Component | View Details |
| – |
Display and lights work, but none of the buttons respond to presses.
|
Keypad / Touch Panel Failure | View Details |
| – |
Frost or ice forming on the evaporator coil or front grille.
|
Evaporator Coil Icing | View Details |
| – |
High-pitched squealing or grinding noise from the indoor unit.
|
Indoor Fan Motor or Blower Bearing Failure | View Details |
| – |
Loud rattling or vibrating noise during operation, especially when compressor starts.
|
Excessive Vibration / Loose Components | View Details |
| – |
Musty or moldy odor from the air conditioner when it starts.
|
Biological Growth on Evaporator and Drain Pan | View Details |
| – |
Outdoor or exhaust fan is not running; unit overheats or shuts down.
|
Condenser Fan Failure | View Details |
| – |
Remote control does not operate the air conditioner, but the unit works from the panel.
|
Remote Control or IR Receiver Failure | View Details |
| – |
Unit blows warm air in cooling mode even though compressor appears to run.
|
Refrigerant Flow or Reversing Valve Issue (Heat Pump Models) | View Details |
| – |
Unit frequently turns on and off (short cycling) without reaching the set temperature.
|
Short Cycling / Improper Control | View Details |
| – |
Unit powers on but compressor does not start; only the fan runs and air is not cold.
|
Compressor Start Failure | View Details |
| – |
Unit runs in dehumidify mode but produces little or no water.
|
Ineffective Dehumidification | View Details |
| – |
Unit shuts off after a few minutes and will not restart until some time has passed.
|
Thermal Overload / Overheating Protection | View Details |
| – |
Unit trips the household circuit breaker or blows a fuse when starting.
|
High Inrush Current / Electrical Short | View Details |
| – |
Water leaking from the front or sides of the unit onto the floor.
|
Condensate Drainage Failure | View Details |
No matching codes found
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