5529 - Bosch Heat Pump Z2 compressor sensor TR1 short circuit warning

What does 5529 mean?

This warning indicates that compressor sensor TR1 in Bosch Heat Pump zone 2 has a short circuit. It triggers after 3 faults (reading >350 kOhm) in 2 hours.

• Compressor sensor TR1 has an internal short circuit.
• The signal cable to compressor sensor TR1 is short circuited.

Click steps to track your progress.

1. 1

   Visually inspect the signal cable to compressor sensor TR1 for any damage or signs of a short circuit.

2. 2

   Check the screw terminal connections for sensor TR1 on the I/O board for any looseness or corrosion.

3. 3

   If the warning persists, contact a qualified technician to measure the sensor's resistance and repair or replace the sensor or cable.