Daikin · Air Conditioner

Daikin Air Conditioner A5 error code

Difficulty: Easy · Cost: $0–$150 · Duration: 15–30m

The A5 error means your Daikin air conditioner's freeze-up protection activated in cooling mode or high pressure control activated in heating mode. The most common user-fixable cause is a clogged air filter restricting airflow — this causes the indoor coil to freeze up in cooling mode. Clean the air filter first. If the filter is clean the indoor heat exchanger thermistor may be defective and a technician is needed.

Common causes

Air filter is clogged with dust reducing airflow over the indoor coil and causing freeze-up
Short circuit airflow — air is being recirculated without passing over the coil properly
Defective indoor unit heat exchanger thermistor

How to fix it

1

Turn off the air conditioner
2

Remove the air filter and clean it — rinse under running water and allow it to dry fully before reinserting
3

Check that nothing is blocking the air inlet or outlet of the indoor unit
4

Allow the indoor coil to defrost completely before restarting
5

Restart the air conditioner and check if A5 returns
6

If the filter is clean and the error persists contact a qualified technician to check the heat exchanger thermistor