HIT

Hitachi 5A

Medium

Set Free Sigma / IVX (FSXN) — Abnormal fan controller fin temperature

Hitachi 5A: Abnormal fan controller fin temperature This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Silicon grease not properly applied between transistor module and radiator fin
Clogged heat exchanger or fan controller failure

Check steps

Restart operation and observe if the alarm recurs
If recurring, apply silicone grease (part no. P22760), clean heat exchanger, or replace fan controller

Affected parts

Fan controller
Transistor module
Heat exchanger
Silicone grease P22760

Safety note

Disconnect power and wait for discharge time before servicing the heat sink.

Source: Hitachi resmi servis kılavuzu (bağımsız çift-doğrulandı) — Hitachi FSXN Series Service Manual (manualslib.com/manual/2375584), §8 Troubleshooting by alarm code — alarm code 5A: "Abnormal fan controller fin temperature." Activation: "This alarm is indicated when the thermistor temperature inside the transistor module increases over 100°C," triggered "when the fan controlle…

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

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