Blue Star Air Conditioner

Blue Star AC E1 error

Indoor room temperature sensor fault / Outdoor unit overheat protection

Needs a technicianReported by one source — verify

Try a reset once. If it comes back, a trained technician should repair it.

Meaning depends on your model

Different Blue Star models use this code for different faults. The most commonly reported meanings are below. Check the model number on the sticker of your unit and your user manual to know which one applies.

Possible meaning 1Indoor room temperature sensor fault

Needs a technician

The control board is getting a wrong reading, or no reading, from the indoor room temperature sensor. Usually the sensor, its wire or its plug is loose, damaged or has failed.

Common causes

Loose or rusted sensor plug on the control board
Sensor wire cut, pinched or bitten by rats
Sensor has failed (open or short circuit)
Less often, a fault on the control board

Try this at home first

Tick each step as you go

Switch off at the wall socket or MCB for 5 minutes, then restart
If the code does not come back, no further action is needed
Look for any visible wire damage from outside — do not open covers

When to call a technician

If the code returns after a reset, a technician needs to test and usually replace the sensor. It is a common, low-cost repair.

Possible meaning 2Outdoor unit overheat protection

You can usually fix it

The outdoor coil is too hot, so the AC reduced power or stopped to protect itself.

Common causes

Very high outdoor temperature
Dirty outdoor coil or blocked air flow
Outdoor fan not running properly

Try this at home first

Tick each step as you go

Clear the space around the outdoor unit; shade it without blocking air flow
Switch off for 20 minutes and restart

When to call a technician

If it repeats, get the outdoor coil washed and the fan checked.

Safety first

Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.

Frequently asked questions

What does E1 mean on a Blue Star Air Conditioner?

Can I fix Blue Star Air Conditioner error E1 myself?

You can try a reset first: Switch off at the wall socket or MCB for 5 minutes, then restart. If the code returns, call a technician.

Is it safe to keep using the Air Conditioner with E1?

Avoid repeated restarts; running with this fault can cause more damage.

Other Blue Star AC codes

E0 Memory (EEPROM) error — indoor unit board E2 Indoor coil (evaporator) temperature sensor fault / Indoor coil anti-freeze protection E3 Outdoor air temperature sensor fault / Communication error (indoor ↔ outdoor unit) / Indoor fan motor fault E4 High pressure / overload protection / Compressor overheating / Indoor fan motor fault / Drain / water overflow protection E5 Overcurrent / compressor overload / Low gas / refrigerant leak or blockage / Communication error (indoor ↔ outdoor unit) E6 Communication error (indoor ↔ outdoor unit) E7 Indoor fan motor fault / Indoor/outdoor mismatch or wrong wiring / Compressor discharge temperature sensor fault

All Blue Star Air Conditioner error codes

Same code on other brands

E1 Indoor room temperature sensor fault / Indoor coil (evaporator) temperature sensor fault / Indoor fan motor fault / Memory (EEPROM) error — indoor unit boardSamsung AC E1 High pressure / overload protection / Communication error (indoor ↔ outdoor unit) / Indoor room temperature sensor faultVoltas AC E1 Control board (PCB) faultDaikin AC E1 Indoor room temperature sensor faultLloyd AC E1 Indoor room temperature sensor faultHaier AC E1 High pressure / overload protectionGree AC IE Water not filling / water supply problemLG Washing Machine E1 Water not filling / water supply problemIFB Washing Machine E1 Water not filling / water supply problemGodrej Washing Machine Err1 Door / lid not closed or not lockingHaier Washing Machine

Sources

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

Last checked: 2026-10-20