Bosch A21 (3141)

Medium

Compress — Humidity sensor faulty (room sensor).

Bosch A21 (3141): Humidity sensor faulty (room sensor). This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Humidity sensor in room unit faulty.

Check steps

Replace room sensor.
Check wiring.

Affected parts

Raumfühler (Feuchte)

Safety note

Low voltage — work carefully.

Source: Bosch resmi servis kılavuzu — Alarm List 8754, code 3141, Display Code A21, Customer: "Humidity sensor faulty — Sensor for relative humidity is faulty in the room sensor for circuit 1."

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

Look up in Enthalio →

Related fault codes

No EMS BUS communication / internal connectionA11 Booster heater limiter (STB) or pressure switcA01 (5246) Hot gas temperature too high (TR6 > 110–120H01 (5311) Z1 phase monitor tripped: one or more supply-vA01 (5273) High pressure guard MR1 tripped.H01 (5508) Compressor control failure – not running / locA01 (5350)