Bosch Mini Split P5 Error Code

What P5 means

P5 means a mode conflict on Bosch Climate 5000 systems (6 flash) - connected indoor units are asking for incompatible operation, such as heating in one room and cooling or dry in another, so the system refuses to run. Set every head/controller to one shared mode; if P5 remains after that, the controller or board needs service.

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

   Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

   Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

2. 2. Fault persists after a clean reset occasional pro only

   Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

   Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.