DD — Room temperature sensor cable broken (heating circuit 1 without mixing valve)

What does DD mean?

The boiler is operating without room temperature influence for heating circuit 1 (without a mixing valve) because its room temperature sensor cable is broken.

• Broken cable connected to the room temperature sensor for heating circuit 1
• Loose connection at the room temperature sensor or remote control

Click steps to track your progress.

1. 1

   Visually inspect the connecting cable of the room temperature sensor for heating circuit 1 for any breaks, cuts, or loose connections.

2. 2

   Check the settings of the remote control for heating circuit 1 (see page 83 of the manual).

3. 3

   If the cable is damaged or the fault persists, contact a qualified heating technician to repair or replace the cable or sensor.