Daikin · Mini-split
A3 Drain level too high / clog
What this code means
The condensate drain pan level is too high, almost always from a clogged drain line.
Most likely causes
- Clogged condensate drain line
- Improperly sloped drain tubing
What to try first
Turn the unit off and use a wet/dry vacuum at the outdoor end of the drain pipe to clear the blockage.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
Find the part on Amazon →FAQ
What does Daikin error code A3 mean?
Drain level too high / clog. The condensate drain pan level is too high, almost always from a clogged drain line.
Can I fix Daikin code A3 myself?
Often, yes. Turn the unit off and use a wet/dry vacuum at the outdoor end of the drain pipe to clear the blockage.
What causes Daikin code A3?
The most common causes are: clogged condensate drain line; improperly sloped drain tubing.
Other Daikin mini-split codes
All Daikin mini-split error codes →
Other mini-split brands: Mitsubishi · LG · Fujitsu · Gree · Carrier · Generic · Panasonic
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.