What does 3 mean?

The boiler has detected no water circulation, which can lead to overheating and system shutdown.

• Circulation pump malfunction or blockage
• Closed isolation valves in the heating circuit
• Airlock in the system

Click steps to track your progress.

1. 1

   Check that all heating circuit isolation valves are fully open.

2. 2

   Ensure the heating system is adequately filled with water and repressurized if necessary.

3. 3

   Contact a qualified heating technician to check the boiler water flow and inspect the circulation pump.