Koldfront
Koldfront 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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E0
Display shows E0 and the unit may not respond to controls or may behave erratically.
Keypad / Control Panel Error
E1
Unit will not run, display shows E1 shortly after power-up or when trying to change modes.
Room Temperature Sensor (Thermistor) Fault
E2
Unit stops cooling and displays E2, fan may still run but compressor will not start.
Evaporator Coil Temperature Sensor Fault
E3
Display shows E3, compressor may not run or unit cycles off prematurely.
Outdoor / Condenser Temperature Sensor Fault
E4
Unit shuts down and displays E4, often after running for some time; may be accompanied by ice on the evaporator or very low airflow.
Evaporator Freeze Protection / Defrost Fault
E5
Display shows E5 and the unit may stop cooling or heating (on heat-capable models).
Overcurrent / Overload Protection Fault
E6
Display shows E6; the unit may not respond correctly to the remote control or may not start.
Communication / Control Panel Fault
E7
Display shows E7; the unit may not operate in certain modes (cool, heat, or fan).
Mode Control / Reversing Valve or Fan Control Fault (model-dependent)
E7-REMOTE
Unit displays E7 or the remote icon flashes; the remote control does not operate the Koldfront air conditioner.
Remote Control Communication Fault
E8
Display shows E8; the unit may shut down or run at reduced capacity.
High Temperature / Overheating Protection Fault
E9
Display shows E9; the unit may not start or may shut down unexpectedly.
EEPROM / Memory Error on Main Control Board
F0
Portable Koldfront unit displays F0 and may not cool effectively.
Low Refrigerant / Refrigeration System Protection (model-dependent)
F1
Display shows F1; the unit may not respond to temperature changes correctly.
Indoor Ambient Temperature Sensor Calibration Fault
F2
Display shows F2; the unit may shut down or fail to cool properly.
Evaporator Sensor Calibration / Range Fault
H1
On heat-capable Koldfront units, the display shows H1, and heating does not start immediately.
Defrost / Warm-Up Protection Mode (Information Code)
H3
On heat-capable models, the display shows H3, and the unit stops heating or cooling.
Compressor Overload / High Temperature Protection
P1
Portable Koldfront air conditioner stops and displays P1; the water tank or drain indicator may be lit.
Internal Condensate Tank Full / High Water Level
P2
Portable Koldfront air conditioner shows P2 and stops cooling; the fan may continue.
High Condensate Level in Heating or Dehumidify Mode (model-dependent)
Symptom
Burning or electrical smell from the unit during operation.
Overheating Electrical Component
Symptom
Clicking or buzzing noise from the control area when the compressor should start, but the compressor does not run.
Relay Chatter / Start Circuit Problem
Symptom
High-pitched squealing or grinding noise from the indoor section when the fan is running.
Blower Motor or Blower Wheel Bearing Failure
Symptom
Koldfront air conditioner runs but airflow from the front grille is very weak.
Restricted Airflow / Blower Problem
Symptom
Koldfront air conditioner will not turn on at all; no lights or display, completely dead.
No Power / Power Supply Failure
Symptom
Loud rattling or vibrating noise when the Koldfront air conditioner is running.
Excessive Vibration / Loose Components
Symptom
Musty or moldy odor from the Koldfront air conditioner when it starts.
Biological Growth in Evaporator and Drain Pan
Symptom
Outdoor fan not running while compressor is running; unit overheats or shuts down.
Condenser Fan Failure
Symptom
The Koldfront portable AC exhaust hose becomes very hot, and the room does not cool well.
Improper Exhaust / Recirculation
Symptom
The display works, but buttons on the control panel do not respond or respond intermittently.
User Interface / Keypad Failure
Symptom
The unit cools for a short time then shuts off, even though the room is still warm; it may restart after several minutes.
Short Cycling
Symptom
The unit displays temperature, but the actual room temperature is much warmer or cooler than indicated.
Thermostat Sensing Error
Symptom
The unit does not respond to remote or panel commands after a power outage.
Control Lockup / Software Hang
Symptom
The unit runs but does not cool the room effectively; air from the vents is only slightly cool or room temperature.
Insufficient Cooling Capacity
Symptom
The unit runs in Cool mode but occasionally blows warm air, then cools again.
Intermittent Cooling / Overheating or Icing
Symptom
The unit turns on but the compressor does not start; only the fan runs, and no cooling occurs.
Compressor Start Failure
Symptom
Unit blows warm air in Cool mode; the compressor seems to run, but no cooling occurs.
Loss of Refrigerant / Refrigeration Failure
Symptom
Unit frequently trips the household circuit breaker when starting or during operation.
Overcurrent / Short Circuit
Symptom
Water leaking from the back or sides of the unit onto the exterior wall or floor.
External Water Leak / Overfilled Base Pan
Symptom
Water leaking from the front of the Koldfront air conditioner into the room.
Indoor Water Leak / Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Display shows E0 and the unit may not respond to controls or may behave erratically.
|
Keypad / Control Panel Error | View Details |
| E1 |
Unit will not run, display shows E1 shortly after power-up or when trying to change modes.
|
Room Temperature Sensor (Thermistor) Fault | View Details |
| E2 |
Unit stops cooling and displays E2, fan may still run but compressor will not start.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Display shows E3, compressor may not run or unit cycles off prematurely.
|
Outdoor / Condenser Temperature Sensor Fault | View Details |
| E4 |
Unit shuts down and displays E4, often after running for some time; may be accompanied by ice on the evaporator or very low airflow.
|
Evaporator Freeze Protection / Defrost Fault | View Details |
| E5 |
Display shows E5 and the unit may stop cooling or heating (on heat-capable models).
|
Overcurrent / Overload Protection Fault | View Details |
| E6 |
Display shows E6; the unit may not respond correctly to the remote control or may not start.
|
Communication / Control Panel Fault | View Details |
| E7 |
Display shows E7; the unit may not operate in certain modes (cool, heat, or fan).
|
Mode Control / Reversing Valve or Fan Control Fault (model-dependent) | View Details |
| E7-REMOTE |
Unit displays E7 or the remote icon flashes; the remote control does not operate the Koldfront air conditioner.
|
Remote Control Communication Fault | View Details |
| E8 |
Display shows E8; the unit may shut down or run at reduced capacity.
|
High Temperature / Overheating Protection Fault | View Details |
| E9 |
Display shows E9; the unit may not start or may shut down unexpectedly.
|
EEPROM / Memory Error on Main Control Board | View Details |
| F0 |
Portable Koldfront unit displays F0 and may not cool effectively.
|
Low Refrigerant / Refrigeration System Protection (model-dependent) | View Details |
| F1 |
Display shows F1; the unit may not respond to temperature changes correctly.
|
Indoor Ambient Temperature Sensor Calibration Fault | View Details |
| F2 |
Display shows F2; the unit may shut down or fail to cool properly.
|
Evaporator Sensor Calibration / Range Fault | View Details |
| H1 |
On heat-capable Koldfront units, the display shows H1, and heating does not start immediately.
|
Defrost / Warm-Up Protection Mode (Information Code) | View Details |
| H3 |
On heat-capable models, the display shows H3, and the unit stops heating or cooling.
|
Compressor Overload / High Temperature Protection | View Details |
| P1 |
Portable Koldfront air conditioner stops and displays P1; the water tank or drain indicator may be lit.
|
Internal Condensate Tank Full / High Water Level | View Details |
| P2 |
Portable Koldfront air conditioner shows P2 and stops cooling; the fan may continue.
|
High Condensate Level in Heating or Dehumidify Mode (model-dependent) | View Details |
| – |
Burning or electrical smell from the unit during operation.
|
Overheating Electrical Component | View Details |
| – |
Clicking or buzzing noise from the control area when the compressor should start, but the compressor does not run.
|
Relay Chatter / Start Circuit Problem | View Details |
| – |
High-pitched squealing or grinding noise from the indoor section when the fan is running.
|
Blower Motor or Blower Wheel Bearing Failure | View Details |
| – |
Koldfront air conditioner runs but airflow from the front grille is very weak.
|
Restricted Airflow / Blower Problem | View Details |
| – |
Koldfront air conditioner will not turn on at all; no lights or display, completely dead.
|
No Power / Power Supply Failure | View Details |
| – |
Loud rattling or vibrating noise when the Koldfront air conditioner is running.
|
Excessive Vibration / Loose Components | View Details |
| – |
Musty or moldy odor from the Koldfront air conditioner when it starts.
|
Biological Growth in Evaporator and Drain Pan | View Details |
| – |
Outdoor fan not running while compressor is running; unit overheats or shuts down.
|
Condenser Fan Failure | View Details |
| – |
The Koldfront portable AC exhaust hose becomes very hot, and the room does not cool well.
|
Improper Exhaust / Recirculation | View Details |
| – |
The display works, but buttons on the control panel do not respond or respond intermittently.
|
User Interface / Keypad Failure | View Details |
| – |
The unit cools for a short time then shuts off, even though the room is still warm; it may restart after several minutes.
|
Short Cycling | View Details |
| – |
The unit displays temperature, but the actual room temperature is much warmer or cooler than indicated.
|
Thermostat Sensing Error | View Details |
| – |
The unit does not respond to remote or panel commands after a power outage.
|
Control Lockup / Software Hang | View Details |
| – |
The unit runs but does not cool the room effectively; air from the vents is only slightly cool or room temperature.
|
Insufficient Cooling Capacity | View Details |
| – |
The unit runs in Cool mode but occasionally blows warm air, then cools again.
|
Intermittent Cooling / Overheating or Icing | View Details |
| – |
The unit turns on but the compressor does not start; only the fan runs, and no cooling occurs.
|
Compressor Start Failure | View Details |
| – |
Unit blows warm air in Cool mode; the compressor seems to run, but no cooling occurs.
|
Loss of Refrigerant / Refrigeration Failure | View Details |
| – |
Unit frequently trips the household circuit breaker when starting or during operation.
|
Overcurrent / Short Circuit | View Details |
| – |
Water leaking from the back or sides of the unit onto the exterior wall or floor.
|
External Water Leak / Overfilled Base Pan | View Details |
| – |
Water leaking from the front of the Koldfront air conditioner into the room.
|
Indoor Water Leak / Drainage Failure | View Details |
No matching codes found
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