FieldBench
Bosch codes

Bosch

P4

Lockout

High compressor discharge temp

T5 overtemp (IDS trips in steps up to a 230°F-class shutdown).

Walk P4 in Diagnose

Sign in for the next measurement

First check

1 Let it cool, then read the drive LED

On Bosch BOVA 2.0 overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Weigh-in / Bosch chart (undercharge is the usual P4).

Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

The rest of the walkthrough is Diagnose.

On the plates

  • Weigh-in / Bosch chart (undercharge is the usual P4).
  • Valves open, indoor blower, outdoor coil, T5 seated.

Plates that use P4