Friedrich
Friedrich 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
Unit will not run, display shows E1 shortly after power-up
Indoor Ambient Temperature Sensor Failure
E2
Unit shuts down or will not cool, display shows E2
Evaporator Coil Temperature Sensor Failure
E3
Unit stops and displays E3, may occur during heating or cooling on heat pump models
Outdoor / Condenser Coil Temperature Sensor Failure
E4
Unit stops and displays E4, often during heating mode on heat pump models
Discharge / Compressor Outlet Temperature Sensor Fault or High Discharge Temperature
E5
Unit displays E5 and may not start compressor or fan
Communication Error Between Indoor and Outdoor PCB (for split / ductless systems) or General Control Board Communication Fault
E6
Unit displays E6, may run briefly then shut down
Indoor Fan Motor Feedback / Hall Sensor Error
E7
Unit displays E7 and will not operate in certain modes
Mode Conflict or Reversing Valve / 4-Way Valve Error (heat pump models)
E8
Unit displays E8 and may shut down on high fan speed or during heavy load
Indoor Fan Motor Overload / Overcurrent Protection
E9
Unit displays E9 and may stop cooling or heating
EEPROM / Memory Error on Main Control Board
F1
Display shows F1, unit may not respond to commands
Keypad / Control Panel Communication Error
F2
Display shows F2, unit may run but temperature control is erratic
Room Temperature Sensor Out of Range (Calibration Error)
F3
Display shows F3, unit may shut down on defrost or heating (heat pump models)
Defrost Sensor / Outdoor Coil Sensor Error
F4
Display shows F4, compressor does not start
Compressor Overload / High Temperature Protection
F5
Display shows F5, unit may not respond to remote or may operate erratically
Remote Control / Receiver Communication Error
H1
Display shows H1, unit may run fan only or delay heating
Defrost or Anti-Cold Air Protection Active (heat pump models)
H3
Display shows H3, compressor does not run
Compressor Overload Protection / Overcurrent
H4
Display shows H4, unit may shut down heating or cooling
Inverter Module / IPM Overheat or Overcurrent (inverter models)
H5
Display shows H5, unit may not start or may shut down shortly after starting
IPM / Inverter Module Protection (Communication or Drive Fault)
HI
Display shows HI and unit may not reach set temperature
High Temperature Indication / Overheat Protection
LO
Display shows LO and unit does not cool properly
Low Temperature Protection / Freeze Protection Active
P1
Display shows P1 and unit stops cooling; water may be present in base pan (portable models)
Full Condensate Tank / High Water Level Protection
P2
Display shows P2, unit may run but with limited cooling (portable models)
High Condensate Level Warning / Partial Tank Full
Symptom
Burning or electrical smell from the unit
Overheating Electrical Component
Symptom
Clicking or buzzing noise from outdoor section, especially at startup
Electrical Relay or Contactor Noise / Hard Starting Compressor
Symptom
Excessive water dripping or running down the exterior wall
High Condensate Production / Improper Outdoor Drainage
Symptom
Front panel buttons do not respond, but remote works
Keypad Failure
Symptom
High-pitched squealing or grinding noise from indoor section
Indoor Fan Motor Bearing Failure
Symptom
Musty or moldy odor when the unit starts
Biological Growth in Evaporator and Drain Pan
Symptom
Outdoor fan does not run but compressor is operating
Condenser Fan Failure
Symptom
Remote control does not operate the unit
Remote Control or Receiver Failure
Symptom
Unit blows cold air in HEAT mode (heat pump models)
Heat Pump Mode Failure
Symptom
Unit blows warm air in COOL mode
Loss of Cooling / Reversing Valve or Refrigerant Issue
Symptom
Unit display and controls work but fan does not blow air
Indoor Fan Failure
Symptom
Unit does not turn on at all (no lights, no display)
No Power / Dead Unit
Symptom
Unit frequently trips the circuit breaker
Overcurrent / Electrical Overload
Symptom
Unit makes loud rattling or vibrating noises during operation
Mechanical Vibration / Loose Components
Symptom
Unit powers on but compressor never starts; only fan runs
Compressor Start Failure
Symptom
Unit runs but airflow is very weak from the front grille
Restricted Airflow
Symptom
Unit runs but does not cool the room effectively
Insufficient Cooling Capacity / Performance Loss
Symptom
Unit short cycles (turns on and off frequently) without reaching set temperature
Short Cycling / Control or Sizing Issue
Symptom
Water leaking from the front of the unit into the room
Condensate Drainage Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Unit will not run, display shows E1 shortly after power-up
|
Indoor Ambient Temperature Sensor Failure | View Details |
| E2 |
Unit shuts down or will not cool, display shows E2
|
Evaporator Coil Temperature Sensor Failure | View Details |
| E3 |
Unit stops and displays E3, may occur during heating or cooling on heat pump models
|
Outdoor / Condenser Coil Temperature Sensor Failure | View Details |
| E4 |
Unit stops and displays E4, often during heating mode on heat pump models
|
Discharge / Compressor Outlet Temperature Sensor Fault or High Discharge Temperature | View Details |
| E5 |
Unit displays E5 and may not start compressor or fan
|
Communication Error Between Indoor and Outdoor PCB (for split / ductless systems) or General Control Board Communication Fault | View Details |
| E6 |
Unit displays E6, may run briefly then shut down
|
Indoor Fan Motor Feedback / Hall Sensor Error | View Details |
| E7 |
Unit displays E7 and will not operate in certain modes
|
Mode Conflict or Reversing Valve / 4-Way Valve Error (heat pump models) | View Details |
| E8 |
Unit displays E8 and may shut down on high fan speed or during heavy load
|
Indoor Fan Motor Overload / Overcurrent Protection | View Details |
| E9 |
Unit displays E9 and may stop cooling or heating
|
EEPROM / Memory Error on Main Control Board | View Details |
| F1 |
Display shows F1, unit may not respond to commands
|
Keypad / Control Panel Communication Error | View Details |
| F2 |
Display shows F2, unit may run but temperature control is erratic
|
Room Temperature Sensor Out of Range (Calibration Error) | View Details |
| F3 |
Display shows F3, unit may shut down on defrost or heating (heat pump models)
|
Defrost Sensor / Outdoor Coil Sensor Error | View Details |
| F4 |
Display shows F4, compressor does not start
|
Compressor Overload / High Temperature Protection | View Details |
| F5 |
Display shows F5, unit may not respond to remote or may operate erratically
|
Remote Control / Receiver Communication Error | View Details |
| H1 |
Display shows H1, unit may run fan only or delay heating
|
Defrost or Anti-Cold Air Protection Active (heat pump models) | View Details |
| H3 |
Display shows H3, compressor does not run
|
Compressor Overload Protection / Overcurrent | View Details |
| H4 |
Display shows H4, unit may shut down heating or cooling
|
Inverter Module / IPM Overheat or Overcurrent (inverter models) | View Details |
| H5 |
Display shows H5, unit may not start or may shut down shortly after starting
|
IPM / Inverter Module Protection (Communication or Drive Fault) | View Details |
| HI |
Display shows HI and unit may not reach set temperature
|
High Temperature Indication / Overheat Protection | View Details |
| LO |
Display shows LO and unit does not cool properly
|
Low Temperature Protection / Freeze Protection Active | View Details |
| P1 |
Display shows P1 and unit stops cooling; water may be present in base pan (portable models)
|
Full Condensate Tank / High Water Level Protection | View Details |
| P2 |
Display shows P2, unit may run but with limited cooling (portable models)
|
High Condensate Level Warning / Partial Tank Full | View Details |
| – |
Burning or electrical smell from the unit
|
Overheating Electrical Component | View Details |
| – |
Clicking or buzzing noise from outdoor section, especially at startup
|
Electrical Relay or Contactor Noise / Hard Starting Compressor | View Details |
| – |
Excessive water dripping or running down the exterior wall
|
High Condensate Production / Improper Outdoor Drainage | View Details |
| – |
Front panel buttons do not respond, but remote works
|
Keypad Failure | View Details |
| – |
High-pitched squealing or grinding noise from indoor section
|
Indoor Fan Motor Bearing Failure | View Details |
| – |
Musty or moldy odor when the unit starts
|
Biological Growth in Evaporator and Drain Pan | View Details |
| – |
Outdoor fan does not run but compressor is operating
|
Condenser Fan Failure | View Details |
| – |
Remote control does not operate the unit
|
Remote Control or Receiver Failure | View Details |
| – |
Unit blows cold air in HEAT mode (heat pump models)
|
Heat Pump Mode Failure | View Details |
| – |
Unit blows warm air in COOL mode
|
Loss of Cooling / Reversing Valve or Refrigerant Issue | View Details |
| – |
Unit display and controls work but fan does not blow air
|
Indoor Fan Failure | View Details |
| – |
Unit does not turn on at all (no lights, no display)
|
No Power / Dead Unit | View Details |
| – |
Unit frequently trips the circuit breaker
|
Overcurrent / Electrical Overload | View Details |
| – |
Unit makes loud rattling or vibrating noises during operation
|
Mechanical Vibration / Loose Components | View Details |
| – |
Unit powers on but compressor never starts; only fan runs
|
Compressor Start Failure | View Details |
| – |
Unit runs but airflow is very weak from the front grille
|
Restricted Airflow | View Details |
| – |
Unit runs but does not cool the room effectively
|
Insufficient Cooling Capacity / Performance Loss | View Details |
| – |
Unit short cycles (turns on and off frequently) without reaching set temperature
|
Short Cycling / Control or Sizing Issue | View Details |
| – |
Water leaking from the front of the unit into the room
|
Condensate Drainage Failure | View Details |
No matching codes found
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