Fault Codes / Hitachi / 5B

Set Free Sigma / IVX (FSXN) — Fan controller overcurrent protection

Possible causes

• Faulty fan motor or defective fan controller
• Inadequate power supply capacity or instantaneous voltage drops

Check steps

• Restart operation; measure supply voltage (220V±10% or 240V±10%, min. 187V during operation)
• Test with DSW1 #1 enabled on PCB2; check fan motor or replace fan controller

Affected parts

• Fan controller
• Fan motor
• PCB2

Safety note

Source: Hitachi resmi servis kılavuzu (bağımsız çift-doğrulandı) — Hitachi FSXN Series Service Manual, §8 Troubleshooting by alarm code, p.236 (manualslib.com/manual/2375584): Alarm code 5B = "Activation of fan controller overcurrent protection device." Manual text: "This alarm is indicated when the instantaneous overcurrent occurs ten times in thirty minutes (retry operation is ca…

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

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