ErrorKhoj

LG Air Conditioner

LG AC CH25 error

Power supply voltage problem

You can usually fix itFrom brand’s official support

Most people can clear this with the simple steps below.

Also shown as: 25

What it means

The supply voltage is too low, too high or unstable, so the appliance stopped itself to avoid damage.

Common causes

  • Low or high mains voltage in your area
  • Stabilizer faulty, overloaded or of the wrong rating
  • Loose plug, socket or wiring
  • Short power cut or fluctuation

Try this at home first

Tick each step as you go

When to call a technician

If the socket voltage is normal and the code repeats, have the wiring and board checked by an electrician or technician.

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 CH25 mean on a LG Air Conditioner?

Power supply voltage problem. The supply voltage is too low, too high or unstable, so the appliance stopped itself to avoid damage.

Can I fix LG Air Conditioner error CH25 myself?

Usually yes. Start with: Wait until the voltage is normal, then restart.

Is it safe to keep using the Air Conditioner with CH25?

Yes, once the cause is fixed.

Other LG AC codes

CH09 Memory (EEPROM) error — indoor unit board CH10 Indoor fan motor fault CH12 Indoor coil middle temperature sensor fault CH21 Inverter board / power module protection CH22 Overcurrent / compressor overload CH23 Inverter board / power module protection CH26 Compressor start / rotation fault CH27 Overcurrent / compressor overload CH28 Inverter board / power module protection CH29 Overcurrent / compressor overload CH32 Compressor overheating CH40 Current sensor (CT) fault

All LG Air Conditioner error codes

Sources

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

Last checked: 2026-10-20