FieldBench
Bosch codes

Bosch

AHU heat limit

Protect

Electric heat limits on the BVA

Strip kit opened a limit / sequencer. This is AHU airflow or a bad element, not a BOVA P-code.

Walk AHU heat limit in Diagnose

Sign in for the next measurement

First check

1 Is aux actually being requested?

On Bosch BOVA 2.0 confirm W / E / aux at the indoor control. A heat-pump call with a communicating board that thinks it needs strips is a config / outdoor issue first. Filter, blower, heat-kit size vs the BVA nameplate.

Expect: Aux request present only when it should be.

The rest of the walkthrough is Diagnose.

On the plates

  • Filter, blower, heat-kit size vs the BVA nameplate.
  • W at the AHU calling strips because HP failed (RV, sensors, ATL) — fix the HP before you upsize strips.
  • No Carrier 33 and no Daikin E3 on this limit string.

Plates that use AHU heat limit