Fault Codes / Bosch / A01 (5908)

Bosch A01 (5908)

High

Compress — Initialization error of inverter control.

Bosch A01 (5908): Initialization error of inverter control. This fault noticeably affects operation.

Possible causes

Inverter does not start correctly / firmware/HW.

Check steps

Power off, restart.
If persists, replace inverter.

Affected parts

Inverter

Safety note

High voltage! Let capacitors discharge.

Source: Bosch/IVT/Buderus Compress Wärmepumpe Alarm-Tabelle (lvisawo.fi/jseducation.se resmi servis kılavuzu aynası) — Not independently re-verified -- third source inaccessible in this pass. Deferring to researcher's report.

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)