What does 1F mean?

The burner is blocked because the differential flow rate is too large, suggesting a restriction or issue within the heat exchanger.

• Accumulation of scale or debris in the heat exchanger
• Partial blockage within the heating system

Click steps to track your progress.

1. 1

   Attempt to reset the boiler by pressing the reset button 'R'.

2. 2

   Ensure the heating system has adequate water pressure.

3. 3

   Contact a qualified heating technician to clean the heat exchanger by flushing or to investigate potential blockages.