Your boiler has detected a minor inconsistency in its temperature readings and has slightly reduced its power to ensure it continues to provide heating and hot water safely.

Comfort safety mode active

What causes this fault?

This occurs when there is a significant difference between the flow and return temperature sensors, suggesting a possible circulation issue. To prevent overheating, the boiler chooses to run at a lower power level rather than shutting down completely. The most common reasons are air trapped in the system or a slight imbalance in the sensors' readings.