How to Fix / Troubleshooting

Safety first: Frequent cycling can reduce boiler life; address the cause promptly.

Check thermostat placement: Ensure the room thermostat is not located near heat sources or in drafts that can cause rapid temperature swings.
Verify control settings: Review boiler and control parameters (e.g., minimum run time, differential) with the installation manual.
Improve system flow: Open additional radiators or circuits to increase load, and ensure all valves are open.
Professional assessment: A heating engineer can adjust system design, add buffer tanks, or reconfigure controls to reduce cycling.

Boiler cycles on and off frequently with short run times, even when there is a continuous demand for heat.

Possible Causes