28 — System supply temperature sensor cable broken (low-loss header)

What does 28 mean?

The boiler is regulating without a supply temperature sensor for the low-loss header because its cable is broken.

• Broken cable connected to the low-loss header sensor
• Loose connection at the low-loss header sensor
• Incorrect coding setting if no low-loss header sensor is present

Click steps to track your progress.

1. 1

   Visually inspect the connecting cable of the low-loss header sensor for any breaks, cuts, or loose connections.

2. 2

   Ensure all wiring connections to the low-loss header sensor are secure.

3. 3

   If no low-loss header sensor is installed, ensure coding address '52' is set to '0'.

4. 4

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