DAI

Daikin L5

Critical

VRV / Sky Air — Inverter compressor instantaneous overcurrent (output overcurrent).

Daikin L5: Inverter compressor instantaneous overcurrent (output overcurrent). This fault typically halts operation and needs immediate attention.

Possible causes

Compressor: winding/earth short or locked rotor.
Inverter PCB / IGBT faulty.
Overload: high condensing pressure (dirty condenser, overcharge, fan).
Supply voltage too low / unstable.

Check steps

Power off; measure compressor winding resistance & insulation (megger).
Check inverter PCB/IGBT.
Check overload causes: condenser clean, charge, fan.
Check supply voltage & phases.

Affected parts

Inverter-Platine
Verdichter

Safety note

High voltage! Let DC-link capacitors discharge before work.

Source: Daikin SM-TS3 (Simple Self-Diagnosis by Malfunction Code, resmi) veya VRV IV+ Service Manual (ManualsLib) — SM-TS3 p.4: 'L5 Inverter instantaneous overcurrent (DC output) — Defective compressor coil (wiring disconnection or insulation failure), Compressor startup failure (mechanical lock), Defective inverter PCB.'

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

Look up in Enthalio →

Related fault codes

Outdoor PCB faulty.E1 Refrigerant shortage (low pressure / stop valvU0 Power supply defect / brief power failure.U2 Transmission error indoor/outdoor unit.U4 Low-pressure protection / LP sensor (suction bE4 Inverter compressor overload / motor lock.E5