Fault Codes / Bosch / A01 (5923)

Bosch A01 (5923)

High

Compress — Heat carrier pump PC0 reports dry run.

Bosch A01 (5923): Heat carrier pump PC0 reports dry run. This fault noticeably affects operation.

Possible causes

No/low flow (water missing/air).

Check steps

Check system pressure & water, bleed.
Check pump & flow.

Affected parts

Heizkreispumpe PC0

Safety note

Depressurize before working.

Source: Bosch resmi servis kılavuzu — Doc: 'A01 Customer Alarm: Dry running of heating pump PC0. Heat carrier pump PC0 reports dry run.' (Cause: 'The heating circuit is not properly filled.')

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)