Daikin Air Conditioner
Daikin AC UA error
Indoor/outdoor mismatch or wrong wiring
Try a reset once. If it comes back, a trained technician should repair it.
What it means
The indoor and outdoor units don’t match each other or are wired incorrectly.
Common causes
- Wrong indoor/outdoor combination
- Connecting wires swapped
- Wrong board setting after a repair
Try this at home first
Tick each step as you go
When to call a technician
An authorised technician must check the model combination and wiring.
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 UA mean on a Daikin Air Conditioner?
Indoor/outdoor mismatch or wrong wiring. The indoor and outdoor units don’t match each other or are wired incorrectly.
Can I fix Daikin Air Conditioner error UA myself?
You can try a reset first: If the AC was just installed or repaired, contact the installer. If the code returns, call a technician.
Is it safe to keep using the Air Conditioner with UA?
Avoid repeated restarts; running with this fault can cause more damage.
Other Daikin AC codes
Sources
We write every explanation in our own words from these references.
Last checked: 2026-10-20