Daikin error code A5
What it means
Freeze-up protection activated for the indoor heat exchanger.
Possible causes
Insufficient indoor airflow Dirty filters or blocked coil Faulty thermistor reporting incorrect coil temperature
Suggested fix
Check and clean filters, verify fan operation and coil cleanliness, and measure the related thermistor resistance; rectify airflow issues or replace the sensor as indicated before clearing the alarm.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Daikin codes
- A1 — Indoor PCB defect or internal failure.
- A6 — Indoor fan motor fault.
- C4 — Faulty indoor heat exchanger temperature sensor.
- C9 — Faulty indoor suction air (room) temperature sensor.
- E1 — Outdoor circuit board fault.
- E7 — Outdoor DC fan motor fault.
- F6 — High pressure control activated in cooling mode.
- U0 — Refrigerant shortage or undercharge detected.
- U2 — Power supply voltage drop or main circuit overvoltage.
- U4 — Transmission failure between indoor and outdoor units.