ErrorKhoj

All Blue Star Air Conditioner error codes

34 codes Reported by one source — verify

Blue Star uses different error code lists for different model series. Treat these meanings as a guide and confirm with your user manual.

All Blue Star Air Conditioner error codes

CodeMeaningAction
E0 Memory (EEPROM) error — indoor unit board Needs a technician
E1 Indoor room temperature sensor fault / Outdoor unit overheat protectionMeaning depends on your model Needs a technician
E2 Indoor coil (evaporator) temperature sensor fault / Indoor coil anti-freeze protectionMeaning depends on your model Needs a technician
E3 Outdoor air temperature sensor fault / Communication error (indoor ↔ outdoor unit) / Indoor fan motor faultMeaning depends on your model Needs a technician
E4 High pressure / overload protection / Compressor overheating / Indoor fan motor fault / Drain / water overflow protectionMeaning depends on your model Needs a technician
E5 Overcurrent / compressor overload / Low gas / refrigerant leak or blockage / Communication error (indoor ↔ outdoor unit)Meaning depends on your model Needs a technician
E6 Communication error (indoor ↔ outdoor unit) Needs a technician
E7 Indoor fan motor fault / Indoor/outdoor mismatch or wrong wiring / Compressor discharge temperature sensor faultMeaning depends on your model Needs a technician
E8 Overcurrent / compressor overload / Control board (PCB) faultMeaning depends on your model Needs a technician
E9 Memory (EEPROM) error — control board Needs a technician
EC Low gas / refrigerant leak or blockage Needs a technician
EE Memory (EEPROM) error — outdoor unit board Needs a technician
F1 Indoor room temperature sensor fault / Outdoor coil (condenser) temperature sensor fault / Indoor coil (evaporator) temperature sensor faultMeaning depends on your model Needs a technician
F2 Indoor coil (evaporator) temperature sensor fault / Compressor discharge temperature sensor fault / Outdoor air temperature sensor faultMeaning depends on your model Needs a technician
F3 Outdoor air temperature sensor fault / Compressor discharge temperature sensor faultMeaning depends on your model Needs a technician
F4 Outdoor coil (condenser) temperature sensor fault / Communication error (power module ↔ main board)Meaning depends on your model Needs a technician
F5 Compressor discharge temperature sensor fault Needs a technician
H1 Defrosting (normal) Not a fault
H3 Outdoor unit overheat protection / Compressor overheatingMeaning depends on your model Needs a technician
H6 Indoor fan motor fault Needs a technician
L1 Power supply voltage problem / Inverter board / power module protectionMeaning depends on your model Needs a technician
L2 Inverter board / power module protection Needs a technician
L3 Outdoor fan motor fault Needs a technician
L4 Current sensor (CT) fault Needs a technician
LC Compressor start / rotation fault Needs a technician
P1 Power supply voltage problem You can usually fix it
P2 Outdoor unit overheat protection You can usually fix it
P3 Overcurrent / compressor overload Needs a technician
P4 Power supply voltage problem You can usually fix it
P5 Overcurrent / compressor overload Needs a technician
P7 Inverter board / power module protection Needs a technician
P8 Inverter board / power module protection Needs a technician
PH Power supply voltage problem You can usually fix it
U4 Communication error (indoor ↔ outdoor unit) Needs a technician

How to see the error code

Most split ACs show the code on the indoor unit display (e.g. E6, CH05). Some models only blink a light — count the blinks, or press the remote’s check/diagnosis button if your manual mentions one.

How to reset

Sources

We write every explanation in our own words from these references.

Last checked: 2026-10-20

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