Daikin Air Conditioner
Daikin AC U2 error
Power supply voltage problem
Most people can clear this with the simple steps below.
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 U2 mean on a Daikin 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 Daikin Air Conditioner error U2 myself?
Usually yes. Start with: Wait until the voltage is normal, then restart.
Is it safe to keep using the Air Conditioner with U2?
Yes, once the cause is fixed.
Other Daikin AC codes
Sources
We write every explanation in our own words from these references.
Last checked: 2026-10-20