I have a combi boiler and have noticed that the boiler turns on for a short while when the cold is turned on,works normally when hot is turned on.
Has anyone got any ideas,cheers Christina
This sometimes happens if theres a long deadleg on the hot, is it capped off where the tank/cylinder was situated ? And has it just started or from install ?
This can be caused by a combination of relatively high pressure and plastic pipe ( internal or external ).
Best way to stop this is a non retrun vavle plus shock arrestor on the inlet to the boiler.
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