Fault Codes / Bosch / A01 (5237)

Bosch A01 (5237)

Medium

Compress — DHW sensor TW1 fault.

Bosch A01 (5237): DHW sensor TW1 fault. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Sensor TW1 or signal cable open/shorted.

Check steps

Check sensor TW1 & signal cable.
Compare resistance with table.

Affected parts

Warmwasserfühler TW1

Safety note

Hot water — scald risk.

Source: Bosch resmi servis kılavuzu — Cross-verified via independent source (IVT_errorcodes.json / lvisawo.fi Alarm List 8754): code 5237 = DHW temp sensor TW1 open circuit, resistance >30kOhm at <0C — matches 'Warmwasserfühler TW1 fehlerhaft'.

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

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