Daikin Mini-Split Code L5
Hard lockout
Output overcurrent detection. The inverter's DC section saw an overcurrent, or the compressor position or speed signal went wrong while running, and the system shut down.
Manual wording: “L5 Output overcurrent detection”
Documented for: RKS/RXS pair outdoor units, FTXM-W/V outdoor units, RMXS multi-split outdoor
Likely causes, most common first
- Poor installation condition
- Closed stop valve
- Defective power module
- Wrong internal wiring
- Abnormal power supply voltage
- Defective outdoor unit PCB
- Defective compressor
What you can safely check yourself
- Check the outdoor unit has clear airflow and adequate clearance
- Turn the system off at the breaker or disconnect switch, leave it off at least 30 seconds, and turn it back on once
When to call a technician
L5 usually means the compressor or the inverter power module is failing, or a stop valve was left closed. All of it is technician work.
A Daikin mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- Service Manual - Inverter Pair FTXS-L Series / FDXS-L Series (SiUS091133) (Daikin, FTXS09/12/15/18/24/30/36LVJU wall mount, FDXS09/12LVJU ducted, RKS/RXS09-36LVJU outdoor) · checked 2026-08-25
- Service Manual - Inverter Pair Wall Mounted Type H-Series (SiUS04-924_A) (Daikin, FTXS30/36HVJU indoor, RKS30/36HVJU and RXS30/36HVJU outdoor) · checked 2026-08-25
- Service Manual - Inverter Pair Wall Mounted Type FTXM-W/V Series (SiUS042113EA) (Daikin, FTXM-W / FTXM-V (Daikin Atmosphera) wall-mount heat pump) · checked 2026-08-25
- 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