Slow flash (blue, normally on, flashes off) — Flue overheat

What does Slow flash (on to off) mean?

The boiler's blue indicator light flashes slowly from on to off, signaling that the flue temperature is too high. This is a safety measure to prevent damage.

• The flue temperature is excessively high

Click steps to track your progress.

1. 1

   Reset the boiler using the user control panel.

2. 2

   Ensure there are no obstructions (leaves, debris) around the external flue terminal on your wall or roof.

3. 3

   Allow the boiler to cool down naturally for a period of time.

4. 4

   If the fault frequently reoccurs, contact a qualified service engineer to inspect the flue system and boiler operation.