Warning Z1 5531 - Compressor temperature sensor TR1 open circuit

What does 5531 mean?

This warning indicates that the circuit for the compressor temperature sensor TR1 is open. This means the sensor connection is loose, the sensor itself is broken, or its signal cable is damaged.

• Screw terminal for compressor sensor TR1 on the I/O module not properly tightened.
• Broken compressor sensor TR1 or its signal cable.
• Defective I/O module.

Click steps to track your progress.

1. 1

   Note the warning code 5531.

2. 2

   Contact a qualified Bosch Heat Pump installer or service technician.

3. 3

   The technician will check the sensor's screw terminal, inspect the sensor and cable for breaks, and test the I/O module.