SMEG Air Conditioners Error Codes

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; fan may still run

Indoor Evaporator Coil Freeze Protection / Low Temperature Protection

E3

E3 error appears and the outdoor unit stops; compressor shuts down quickly

Low-Pressure Protection / Refrigerant Undercharge

E4

E4 code on indoor display; unit stops heating or cooling intermittently

Discharge Temperature High / Compressor Overheat Protection

E5

E5 displayed; 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 indoor louver does not move or is stuck in one position

Indoor Louver Motor / Stepper Motor Fault

E8

E8 displayed; unit stops and may blow only fan air

Indoor Fan Motor Overload / Overcurrent

E9

E9 error; unit may stop and drain pan may be full of water

Full Drain Pan / Water Level Protection (for some SMEG portable or cassette units)

F0

F0 code appears; unit may not start compressor

Indoor Ambient Temperature Sensor Fault

F1

F1 error; unit may run fan only and not cool/heat properly

Indoor Evaporator Coil Temperature Sensor Fault

F2

F2 code; outdoor unit may not start or may shut down quickly

Outdoor Ambient Temperature Sensor Fault

F3

F3 error; unit may stop during heating mode

Outdoor Coil Temperature Sensor Fault

F4

F4 code; compressor may not start or may shut down unexpectedly

Compressor Discharge Temperature Sensor Fault

F5

F5 error; 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; outdoor unit may frost heavily

Defrost Mode Active / Defrost Protection Indication

H3

H3 error; compressor stops and unit shuts down

Compressor Overload / Overheat Protection (Non-sensor)

H4

H4 code; indoor unit may not respond or may shut down

Indoor Fan Motor Lock / Protection

H5

H5 error; unit does not start compressor

IPM (Intelligent Power Module) Protection

P0

P0 code; unit may limit capacity or shut down

DC Bus Voltage Protection

P1

P1 code; unit may not start or may stop unexpectedly

Low Voltage Protection

P2

P2 code; unit may stop cooling and show water-related warning (portable units)

Full Condensate Tank / Water Level Protection (Portable SMEG AC)

P4

P4 code; indoor unit may stop and louver may close

Indoor Coil High Temperature / Overheat Protection

Symptom

Indoor unit displays lights but buttons on the unit do not respond

Keypad / Touch Panel Failure

Symptom

Indoor unit emits unpleasant musty or moldy odor when starting

Biological Growth on Evaporator and Drain Pan

Symptom

Indoor unit freezes up with ice on the evaporator coil

Evaporator Icing / Low Airflow or Low Refrigerant

Symptom

Indoor unit leaks water from the front panel or onto the wall

Condensate Drain Blockage / Poor Drainage

Symptom

Indoor unit runs but no cooling; air is room temperature or only slightly cooler

Loss of Cooling Capacity / Refrigerant Undercharge

Symptom

Loud humming or knocking noise from outdoor unit when running

Outdoor Mechanical Noise / Compressor or Fan Issue

Symptom

Loud rattling or buzzing noise from indoor unit during operation

Indoor Mechanical Vibration / Loose Components

Symptom

Outdoor unit fan runs but compressor does not start; no cooling

Compressor Start Failure

Symptom

Portable SMEG air conditioner exhaust hose gets very hot and room does not cool well

Poor Exhaust and Intake Management (Portable Unit)

Symptom

Remote control does not operate the indoor unit

IR Communication Failure

Symptom

Unit blows warm air in cooling mode or cold air in heating mode intermittently

Reversing Valve / 4-Way Valve Malfunction (Heat Pump Models)

Symptom

Unit does not power on at all; no lights or display on indoor unit

No Power / Supply or Fuse Failure

Symptom

Unit operates but room humidity remains high; clammy feeling

Poor Dehumidification Performance

Symptom

Unit powers on but compressor and outdoor fan never start; only indoor fan runs

Outdoor Unit Not Responding / Control or Power Fault

Symptom

Unit short cycles: frequently turns on and off within a few minutes

Control or Sizing Issue / Thermostat Cycling

Symptom

Unit trips the circuit breaker when starting or during operation

Electrical Short or Overcurrent