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i have an oil boiler , when I’m calling for heat for radiators, why does my boiler only come on for a few minutes then switch off?
Or some other sensor in the boiler is indicating a fault - often there is a 'flame out' detector that is a photocell and that can be fooled if it gets sooty.
So, is the boiler hot, are the pipes hot?, is the flame nice and bright.
And do not overlook the obvious - has the room thermostat or the timer been set to minimum ?
is the oil present and not wet or bubbly so the flame is unstable.
Is there water in the system, is the pump turning.....
pipes are all hot?
I assume from you saying the water in boiler is heated so no need it to constantly burn