Viessmann · Vitodens 200/222 Boilers
The boiler has detected a problem with the gas supply, specifically no or low gas pressure. This prevents the burner from igniting safely.
Click steps to track your progress.
Check your main gas supply and ensure other gas appliances in your home are working.
Verify that the gas isolation valve for the boiler is fully open.
Press the reset button R on the boiler.
If the issue persists, contact a qualified gas safe engineer to inspect the gas supply.