5533 - Bosch Heat Pump Z1 compressor sensor TR1 faulty alarm

What does 5533 mean?

This alarm indicates a fault, failure, or short circuit with compressor sensor TR1 in Bosch Heat Pump zone 1. It triggers after 3 faults in 3 hours, or 15 minutes of failure/short circuit on the sensor.

• The screw terminal on the I/O board connected to compressor sensor TR1 is not tightened.
• The compressor sensor TR1 or its signal cable has failed.
• The compressor sensor TR1 or its signal cable has a short circuit.

Click steps to track your progress.

1. 1

   Power cycle the Heat Pump to see if the alarm clears.

2. 2

   If the Heat Pump was recently serviced, contact your installer to check the screw terminal connection for sensor TR1 on the I/O board for proper tightness.

3. 3

   If the alarm persists, contact a qualified technician to inspect compressor sensor TR1 and its signal cable for faults or short circuits.