What the manual says
Manufacturer manualBurner goes out (over-run period)
From this model's manual
Verified against the Halstead Club He 18 installation & service manual.
DIY fix possible
Check that your room thermostat is set to the desired temperatureEnsure at least one or two radiators have their valves fully open to allow heat to dissipateMonitor the display to see if the 'h' changes to a temperature reading once the cooling period ends
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