Skip to main contentStart diagnosing L5 on your Daikin heat pump
What this code means
Output overcurrent detection – position signal error, rotation speed error, or output overcurrent signal detected while compressor is running.
First step from the service manual
Check installation condition and verify stop valve is fully open.
Next steps: diagnose the root cause
1
Verify the error code is active
Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.
2
Get the full diagnostic procedure
Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.
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What’s available for Daikin heat pump models
Access Daikin heat pump service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.