Bosch A11

Medium

Compress — No EMS BUS communication / internal connection interrupted.

Bosch A11: No EMS BUS communication / internal connection interrupted. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Poor EMS connection display↔board.
Accessory not properly connected.

Check steps

Check & retighten EMS cabling both ends.
Check accessory modules.

Affected parts

EMS-Buskabel
Reglerplatine

Safety note

De-energise before work.

Source: Bosch resmi servis kılavuzu — Bosch Thermotechnik – 'Alarm List A/W Split (8754)', 2018-01-10, alarm code 1010 / customer display code A11: "No communication via EMS BUS connection" — Alarm definition: "The local device hasn't received its EMS token from the EMS bus master for 2 minutes." Possible cause: "Bre…

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

Look up in Enthalio →

Related fault codes

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) No communication via EMS BUS.A11 (1010)