Alarm: Installation pump has no contact with the supply temperature sensor

What does Installation pump no contact mean?

This alarm indicates that the system's installation pump has lost communication with the supply temperature sensor. When this occurs, the additional heat function is blocked, and the system enters alarm operation, which may result in reduced comfort.

• Faulty supply temperature sensor
• Loose electrical connection to the sensor
• Problem with the installation pump or its wiring
• Communication bus error

Click steps to track your progress.

1. 1

   Select "Reset alarm and try again" on the display to see if the communication can be re-established.

2. 2

   If the alarm re-appears, select "Start auxiliary mode" to maintain some level of heat and/or hot water production.

3. 3

   Carefully check the electrical connections to both the installation pump and the supply temperature sensor.

4. 4

   Contact your certified installer for professional inspection and potential replacement of the sensor or pump.