Bosch fault codes

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

1 plate

Outdoor T4 outside the allowed window (cool: T4 ≥125°F or <15°F; heat: T4 ≥86°F or <−4°F on IDS 2.0), or the reversing-valve call is wrong so the outdoor thinks it is in the wrong mode.

1 plate

T3 reads implausible vs T4 (T3 < T4 − 3°F for 10 min).

1 plate

T3, T3L, T4, T5, or TF out of range.

1 plate

Line voltage out of band (IDS: operate ~180–270 V; typical run ≥210 V).

1 plate

Outdoor fan failed or the board is not driving it.

1 plate

T5 not tracking (T5 < T3 − 5°F in cool, or similar band in heat, for 10 min) — plug not on the discharge or a real high-discharge event.

1 plate

Outdoor control EEPROM / memory chip.

1 plate

Communication fault in the main control / EEPROM seating. Field: indoor–outdoor handshake and the outdoor board itself.

1 plate

Suction PT failed or disagrees with gauges.

1 plate

T3 outdoor-coil overtemp.

1 plate

HPS opened (airflow, overcharge, restriction, or failed switch).

1 plate

Low-pressure protection in cool, or high discharge superheat protection in heat (IDS: <44 psi for 5 min cool; high discharge SH band in heat).

1 plate

Inverter current out of band (tonnage-specific trip on the IDS card).

1 plate

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

1 plate