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Mend Potterton 24 Boiler Pcb Thermostat

after 10 seconds boiler goes out?

when my potterton 24 boiler reaches temperature it goes out for 10 seconds and reignites ,this continues. I have replaced pcb/safety thermostate/flame sensing eloctrode. But problem is still there

l spencer
March 2008
do you have thrmostatic radiator valves on all your radiators? this may be the reason!
If this is a combi boiler then you should have at least one radiator fitted with a normal wheel valve to allow circulation for the pump in case you shut all thermostatic valves on radiators.
The one with the wheel valve needs to be open at all times.

gary
March 2008

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