Warning Z1 Condensate sensor heating mode TR3 open circuit — Condensate sensor connection issue

What does 5414 mean?

This warning occurs if the circuit for the condensate sensor TR3 is broken (resistance over 179 kOhm).

• The screw terminal on the I/O module for sensor TR3 is not tightened properly.
• The sensor TR3 or its signal cable is broken.
• Defective I/O module.

Click steps to track your progress.

1. 1

   Check that the screw terminal on the I/O-module for sensor TR3 is properly tightened.

2. 2

   With the sensor disconnected from the I/O module, measure the resistance of the sensor and compare it to table values in the documentation.

3. 3

   If the sensor is broken, replace it. If the sensor measures correctly but the warning persists, replace the I/O module.