Samsung Air Conditioner

Samsung AC E202 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 E202 mean on a Samsung 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 Samsung Air Conditioner error E202 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 E202?

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

Other Samsung AC codes

E121 Indoor room temperature sensor fault E122 Indoor coil (evaporator) temperature sensor fault E123 Indoor coil outlet temperature sensor fault E154 Indoor fan motor fault E163 Memory (EEPROM) error — indoor unit board E201 Communication error (indoor ↔ outdoor unit) E203 Communication error (between control boards) E221 Outdoor air temperature sensor fault E231 Outdoor coil (condenser) temperature sensor fault E251 Compressor discharge temperature sensor fault E403 Indoor coil anti-freeze protection E407 High pressure / overload protection

All Samsung Air Conditioner error codes

Sources

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

Last checked: 2026-10-20