Daikin error code E1
What it means
Outdoor circuit board fault.
Possible causes
Component failure on outdoor PCB Damaged tracks due to overheating or moisture Surge or corrosion affecting control circuits
Suggested fix
Visually inspect the outdoor PCB, confirm correct supply and check for shorted loads; if board failure is verified by electrical tests, replace the PCB and reconfigure any necessary settings.
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.
- 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.
- 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.