Fault Codes / Airwell / d4
VRF Engineering Manual — Low pressure protection (via sensor).
Airwell d4: Low pressure protection (via sensor). This fault typically halts operation and needs immediate attention.
Source: Airwell VRF Series Air Conditioner Engineering Manual, "Fault And Protection Code List" p.301 (ManualsLib scan of official manual)
Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.
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