F.76 — Overheating protection on primary heat exchanger triggered

What does F.76 mean?

The overheating protection on the primary heat exchanger has been activated. This can be caused by a fault in the cable or connection of the fuse within the primary heat exchanger, or a defect in the heat exchanger itself.

• Cable or cable connection of fuse in the primary heat exchanger defective.
• Primary heat exchanger defective.

Click steps to track your progress.

1. 1

   Reset the boiler by pressing the reset button.

2. 2

   Ensure the system has adequate water pressure (check the pressure gauge).

3. 3

   If the error persists, contact a qualified service technician immediately to inspect the primary heat exchanger and its safety components.