Blue Star Air Conditioner

Blue Star AC E6 error

Communication error (indoor ↔ outdoor unit)

Needs a technicianCross-checked from 2+ sources

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

What it means

Two parts of the appliance (indoor ↔ outdoor unit) have stopped talking to each other. A loose wire, low voltage or a faulty board can cause this.

Common causes

Loose or damaged connecting / signal wire
Low or fluctuating voltage, or a faulty stabilizer
Water, insects or rust on terminals
Faulty control board

Try this at home first

Tick each step as you go

Switch off at the MCB for 5–10 minutes, then switch on
Make sure the stabilizer is on and working
If the unit was recently installed or shifted, ask the installer to check the wiring

When to call a technician

If it comes back, a technician should check the connecting cable and boards. Do not open the outdoor unit yourself — it has high voltage.

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 E6 mean on a Blue Star Air Conditioner?

Communication error (indoor ↔ outdoor unit). Two parts of the appliance (indoor ↔ outdoor unit) have stopped talking to each other. A loose wire, low voltage or a faulty board can cause this.

Can I fix Blue Star Air Conditioner error E6 myself?

You can try a reset first: Switch off at the MCB for 5–10 minutes, then switch on. If the code returns, call a technician.

Is it safe to keep using the Air Conditioner with E6?

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

Other Blue Star AC codes

E0 Memory (EEPROM) error — indoor unit board E1 Indoor room temperature sensor fault / Outdoor unit overheat protection 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) E7 Indoor fan motor fault / Indoor/outdoor mismatch or wrong wiring / Compressor discharge temperature sensor fault E8 Overcurrent / compressor overload / Control board (PCB) fault E9 Memory (EEPROM) error — control board EC Low gas / refrigerant leak or blockage EE Memory (EEPROM) error — outdoor unit board F1 Indoor room temperature sensor fault / Outdoor coil (condenser) temperature sensor fault / Indoor coil (evaporator) temperature sensor fault

All Blue Star Air Conditioner error codes

Same code on other brands

E6 Outdoor coil (condenser) temperature sensor faultSamsung AC E6 Communication error (indoor ↔ outdoor unit)Voltas AC E6 Compressor start / rotation faultDaikin AC E6 Communication error (indoor ↔ outdoor unit)Gree AC LE Motor / drum rotation faultLG Washing Machine E-06 Heating faultSamsung Microwave

Sources

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

Last checked: 2026-10-20