Boiler starts and stops frequently (short cycling) even when heating demand is present.

Safety: Adjust only user-accessible settings unless you are qualified.

• Check thermostat location: Ensure the room thermostat is not near heat sources or in a draught, which can cause rapid on/off cycling.
• Adjust boiler power: In the Klimosz control menu, reduce the maximum heating output or adjust modulation settings according to the installation manual.
• Increase system volume: If the system is very small (few radiators), consider adding a buffer tank or additional radiator to increase water volume.
• Review control parameters: Some Klimosz controllers allow setting minimum burner on/off times. Increase these within recommended limits to reduce cycling.