Daikin Mini-Split Code L1
Hard lockout
Outdoor unit PCB abnormality on the inverter side. Overcurrent was detected during waveform output before the compressor started, or the current sensor misbehaved during synchronous start-up.
Manual wording: “L1 Outdoor unit PCB abnormality”
Documented for: RMXS multi-split outdoor units
Likely causes, most common first
- IPM (power module) failure
- Current sensor failure
- Failure of IGBT or drive circuit
- Defective main PCB (A1P)
What you can safely check yourself
- Turn the system off at the breaker or disconnect switch, wait a minute, and turn it back on once
When to call a technician
L1 is an inverter power-section failure. It ends in an outdoor board replacement by a technician.
A Daikin mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Service Manual - Multi-Split Type Air Conditioners RMXS-L Series (SiUS181631EA) (Daikin, RMXS48LVJU outdoor, BPMKS048A2U/049A3U branch provider, CTXG/CTXS/FTXS/CDXS/FDXS/FVXS/FFQ indoor units) · checked 2026-08-25