Daikin error code A1
What it means
Indoor PCB defect or internal failure.
Possible causes
Component failure on indoor PCB Surge or electrical stress damaging tracks Incorrect field wiring causing board damage
Suggested fix
Perform visual and electrical inspection of the indoor PCB, isolate connected loads and verify supply parameters; when board failure is confirmed, replace the PCB and reapply all required settings before recommissioning.
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
- A5 — Freeze-up protection activated for the indoor heat exchanger.
- 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.