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hughesmichelleSep 8, 2025
What to do if Viessmann VITOGAS 100 Boiler will not start and high limit safety cut-out activated?
- AArthur WaltonSep 8, 2025
If your Viessmann Boiler is not starting and the high limit safety cut-out has activated, check the setting and the function of the thermostat. Wait approximately 17 minutes; if the boiler then starts automatically, check the flue pipe and the chimney. If the boiler does not start automatically, check the flue gas monitor. Fit strapping plug aNS or a flue gas monitoring sensor.