DAI

Daikin L9

Critical

VRV / Sky Air — Compressor lock prevention (startup/stall protection).

Daikin L9: Compressor lock prevention (startup/stall protection). This fault typically halts operation and needs immediate attention.

Possible causes

High differential pressure at start.
Stiff compressor.

Check steps

Allow pressure equalization, restart.
Check compressor & INV startup.

Affected parts

Verdichter
Inverter-Platine

Safety note

High voltage! Let capacitors discharge.

Source: Daikin SM-TS3 (Simple Self-Diagnosis by Malfunction Code, resmi) veya VRV IV+ Service Manual (ManualsLib) — SM-TS3 p.4: L9 'Malfunction of inverter compressor startup error (Stall prevention)' — RA/SkyAir/VRV checked only (no Package/Chiller). Matches researcher's claim exactly.

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 instantaneous overcurrent L5