SMEG 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
Indoor unit displays E0 and will not start cooling or heating.
Indoor Unit EEPROM / Main PCB Communication Error
E1
Indoor unit shows E1 and stops operation shortly after starting.
High-Pressure Protection / Refrigerant System Overpressure
E2
Indoor unit displays E2 and stops cooling; the fan may still run.
Indoor Evaporator Coil Freeze Protection / Low Temperature Protection
E3
E3 error appears and the outdoor unit stops; the compressor shuts down quickly.
Low-Pressure Protection / Refrigerant Undercharge
E4
E4 code on indoor display; the unit stops heating or cooling intermittently.
Discharge Temperature High / Compressor Overheat Protection
E5
E5 displayed; the compressor does not start or stops shortly after starting.
Overcurrent Protection / Compressor Overload
E6
Indoor unit shows E6 and does not respond properly to remote commands.
Communication Error Between Indoor and Outdoor Units
E7
E7 error and the indoor louver does not move or is stuck in one position.
Indoor Louver Motor / Stepper Motor Fault
E8
E8 displayed; the unit stops and may blow only fan air.
Indoor Fan Motor Overload / Overcurrent
E9
E9 error; the unit may stop and the drain pan may be full of water.
Full Drain Pan / Water Level Protection (for some SMEG portable or cassette units)
F0
F0 code appears; the unit may not start the compressor.
Indoor Ambient Temperature Sensor Fault
F1
F1 error; the unit may run the fan only and not cool/heat properly.
Indoor Evaporator Coil Temperature Sensor Fault
F2
F2 code; the outdoor unit may not start or may shut down quickly.
Outdoor Ambient Temperature Sensor Fault
F3
F3 error; the unit may stop during heating mode.
Outdoor Coil Temperature Sensor Fault
F4
F4 code; the compressor may not start or may shut down unexpectedly.
Compressor Discharge Temperature Sensor Fault
F5
F5 error; the outdoor fan may not run or runs erratically.
Outdoor Fan Motor Feedback/Speed Error
F6
F6 code; compressor speed control malfunction on inverter models.
Inverter Module/Compressor Drive Fault
H1
H1 displayed during heating; the outdoor unit may frost heavily.
Defrost Mode Active/Defrost Protection Indication
H3
H3 error; the compressor stops and the unit shuts down.
Compressor Overload/Overheat Protection (Non-sensor)
H4
H4 code; the indoor unit may not respond or may shut down.
Indoor Fan Motor Lock/Protection
H5
H5 error; the unit does not start the compressor.
IPM (Intelligent Power Module) Protection
P0
P0 code; the unit may limit capacity or shut down.
DC Bus Voltage Protection
P1
P1 code; the unit may not start or may stop unexpectedly.
Low Voltage Protection
P2
P2 code; unit may stop cooling and show a water-related warning (portable units)
Full Condensate Tank / Water Level Protection (Portable SMEG AC)
P4
P4 code; indoor unit may stop and the louver may close.
Indoor Coil High Temperature / Overheat Protection
Symptom
Indoor unit emits an unpleasant musty or moldy odor when starting.
Biological Growth on Evaporator and Drain Pan
Symptom
Indoor unit leaks water from the front panel or onto the wall.
Condensate Drain Blockage / Poor Drainage
Symptom
Indoor unit runs but provides no cooling; air is room temperature or only slightly cooler.
Loss of Cooling Capacity / Refrigerant Undercharge
Symptom
Loud humming or knocking noise from the outdoor unit when running.
Outdoor Mechanical Noise / Compressor or Fan Issue
Symptom
Loud rattling or buzzing noise from the indoor unit during operation.
Indoor Mechanical Vibration / Loose Components
Symptom
Remote control does not operate the indoor unit.
IR Communication Failure
Symptom
The indoor unit displays lights, but buttons on the unit do not respond.
Keypad / Touch Panel Failure
Symptom
The indoor unit freezes up with ice on the evaporator coil.
Evaporator Icing / Low Airflow or Low Refrigerant
Symptom
The outdoor unit fan runs but the compressor does not start; no cooling.
Compressor Start Failure
Symptom
The portable SMEG air conditioner exhaust hose gets very hot, and the room does not cool well.
Poor Exhaust and Intake Management (Portable Unit)
Symptom
The unit blows warm air in cooling mode or cold air in heating mode intermittently.
Reversing Valve / 4-Way Valve Malfunction (Heat Pump Models)
Symptom
The unit operates but room humidity remains high, causing a clammy feeling.
Poor Dehumidification Performance
Symptom
The unit trips the circuit breaker when starting or during operation.
Electrical Short or Overcurrent
Symptom
Unit does not power on at all; no lights or display on the indoor unit.
No Power / Supply or Fuse Failure
Symptom
Unit powers on, but the compressor and outdoor fan never start; only the indoor fan runs.
Outdoor Unit Not Responding / Control or Power Fault
Symptom
Unit short cycles: it frequently turns on and off within a few minutes.
Control or Sizing Issue / Thermostat Cycling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Indoor unit displays E0 and will not start cooling or heating.
|
Indoor Unit EEPROM / Main PCB Communication Error | View Details |
| E1 |
Indoor unit shows E1 and stops operation shortly after starting.
|
High-Pressure Protection / Refrigerant System Overpressure | View Details |
| E2 |
Indoor unit displays E2 and stops cooling; the fan may still run.
|
Indoor Evaporator Coil Freeze Protection / Low Temperature Protection | View Details |
| E3 |
E3 error appears and the outdoor unit stops; the compressor shuts down quickly.
|
Low-Pressure Protection / Refrigerant Undercharge | View Details |
| E4 |
E4 code on indoor display; the unit stops heating or cooling intermittently.
|
Discharge Temperature High / Compressor Overheat Protection | View Details |
| E5 |
E5 displayed; the compressor does not start or stops shortly after starting.
|
Overcurrent Protection / Compressor Overload | View Details |
| E6 |
Indoor unit shows E6 and does not respond properly to remote commands.
|
Communication Error Between Indoor and Outdoor Units | View Details |
| E7 |
E7 error and the indoor louver does not move or is stuck in one position.
|
Indoor Louver Motor / Stepper Motor Fault | View Details |
| E8 |
E8 displayed; the unit stops and may blow only fan air.
|
Indoor Fan Motor Overload / Overcurrent | View Details |
| E9 |
E9 error; the unit may stop and the drain pan may be full of water.
|
Full Drain Pan / Water Level Protection (for some SMEG portable or cassette units) | View Details |
| F0 |
F0 code appears; the unit may not start the compressor.
|
Indoor Ambient Temperature Sensor Fault | View Details |
| F1 |
F1 error; the unit may run the fan only and not cool/heat properly.
|
Indoor Evaporator Coil Temperature Sensor Fault | View Details |
| F2 |
F2 code; the outdoor unit may not start or may shut down quickly.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F3 |
F3 error; the unit may stop during heating mode.
|
Outdoor Coil Temperature Sensor Fault | View Details |
| F4 |
F4 code; the compressor may not start or may shut down unexpectedly.
|
Compressor Discharge Temperature Sensor Fault | View Details |
| F5 |
F5 error; the outdoor fan may not run or runs erratically.
|
Outdoor Fan Motor Feedback/Speed Error | View Details |
| F6 |
F6 code; compressor speed control malfunction on inverter models.
|
Inverter Module/Compressor Drive Fault | View Details |
| H1 |
H1 displayed during heating; the outdoor unit may frost heavily.
|
Defrost Mode Active/Defrost Protection Indication | View Details |
| H3 |
H3 error; the compressor stops and the unit shuts down.
|
Compressor Overload/Overheat Protection (Non-sensor) | View Details |
| H4 |
H4 code; the indoor unit may not respond or may shut down.
|
Indoor Fan Motor Lock/Protection | View Details |
| H5 |
H5 error; the unit does not start the compressor.
|
IPM (Intelligent Power Module) Protection | View Details |
| P0 |
P0 code; the unit may limit capacity or shut down.
|
DC Bus Voltage Protection | View Details |
| P1 |
P1 code; the unit may not start or may stop unexpectedly.
|
Low Voltage Protection | View Details |
| P2 |
P2 code; unit may stop cooling and show a water-related warning (portable units)
|
Full Condensate Tank / Water Level Protection (Portable SMEG AC) | View Details |
| P4 |
P4 code; indoor unit may stop and the louver may close.
|
Indoor Coil High Temperature / Overheat Protection | View Details |
| – |
Indoor unit emits an unpleasant musty or moldy odor when starting.
|
Biological Growth on Evaporator and Drain Pan | View Details |
| – |
Indoor unit leaks water from the front panel or onto the wall.
|
Condensate Drain Blockage / Poor Drainage | View Details |
| – |
Indoor unit runs but provides no cooling; air is room temperature or only slightly cooler.
|
Loss of Cooling Capacity / Refrigerant Undercharge | View Details |
| – |
Loud humming or knocking noise from the outdoor unit when running.
|
Outdoor Mechanical Noise / Compressor or Fan Issue | View Details |
| – |
Loud rattling or buzzing noise from the indoor unit during operation.
|
Indoor Mechanical Vibration / Loose Components | View Details |
| – |
Remote control does not operate the indoor unit.
|
IR Communication Failure | View Details |
| – |
The indoor unit displays lights, but buttons on the unit do not respond.
|
Keypad / Touch Panel Failure | View Details |
| – |
The indoor unit freezes up with ice on the evaporator coil.
|
Evaporator Icing / Low Airflow or Low Refrigerant | View Details |
| – |
The outdoor unit fan runs but the compressor does not start; no cooling.
|
Compressor Start Failure | View Details |
| – |
The portable SMEG air conditioner exhaust hose gets very hot, and the room does not cool well.
|
Poor Exhaust and Intake Management (Portable Unit) | View Details |
| – |
The unit blows warm air in cooling mode or cold air in heating mode intermittently.
|
Reversing Valve / 4-Way Valve Malfunction (Heat Pump Models) | View Details |
| – |
The unit operates but room humidity remains high, causing a clammy feeling.
|
Poor Dehumidification Performance | View Details |
| – |
The unit trips the circuit breaker when starting or during operation.
|
Electrical Short or Overcurrent | View Details |
| – |
Unit does not power on at all; no lights or display on the indoor unit.
|
No Power / Supply or Fuse Failure | View Details |
| – |
Unit powers on, but the compressor and outdoor fan never start; only the indoor fan runs.
|
Outdoor Unit Not Responding / Control or Power Fault | View Details |
| – |
Unit short cycles: it frequently turns on and off within a few minutes.
|
Control or Sizing Issue / Thermostat Cycling | View Details |
No matching codes found
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