Daikin · Mini-split
A5 Overheating or anti-icing of indoor heat exchanger
What this code means
The indoor coil is running too hot or the anti-icing protection has engaged, often from airflow or sizing issues.
Most likely causes
- Dirty air filter restricting airflow
- Unit oversized for the space, causing short-cycling
What to try first
Clean or replace the indoor air filter first.
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 A5 mean?
Overheating or anti-icing of indoor heat exchanger. The indoor coil is running too hot or the anti-icing protection has engaged, often from airflow or sizing issues.
Can I fix Daikin code A5 myself?
Often, yes. Clean or replace the indoor air filter first.
What causes Daikin code A5?
The most common causes are: dirty air filter restricting airflow; unit oversized for the space, causing short-cycling.
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.