5531 - Bosch Heat Pump Z1 compressor sensor TR1 failure warning

What does 5531 mean?

This warning indicates a failure of compressor sensor TR1 in Bosch Heat Pump zone 1. It triggers after 3 faults (reading >170 kOhm) in 2 hours.

• Compressor sensor TR1 has failed.
• The I/O board is not working correctly.
• Damage or poor connection in the sensor's wiring.

Click steps to track your progress.

1. 1

   Power cycle the Heat Pump to reset the system and see if the warning clears.

2. 2

   Check for any visible damage to the wiring connected to compressor sensor TR1.

3. 3

   If the warning persists, contact a qualified technician to test sensor TR1 and the I/O board for proper function.