Boiler does not ramp up to high fire - Blocked gas valve screen

What does No high fire mean?

The boiler, especially in multiple boiler systems with cascade control, fails to ramp up to its high fire setting, indicating a potential blockage in the gas supply.

• Blockage in the inlet gas valve mesh screen

Click steps to track your progress.

1. 1

   Check the inlet gas valve mesh screen for any signs of blockage.

2. 2

   Clean the inlet gas valve mesh screen thoroughly.

3. 3

   If this issue occurs more than twice a year, contact Viessmann for further assistance and professional inspection.