Fault Codes / Hitachi / 53
Set Free Sigma / IVX — Activation of the transistor module protection device.
Hitachi 53: Activation of the transistor module protection device. This fault usually isn't an immediate stop, but should be checked soon.
Source: Hitachi RAS-2-HVNP VRF Service Manual, "Alarm Codes For The Outdoor And Indoor Units" p.207 (ManualsLib scan of official manual)
Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.
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