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How can i fix the low pressure in my boiler?

I have a Britony Combi SE. 80 boiler. The problem is whenever the boiler goes off the pressure drops and it wont fire up again. However if you have it running continually it will stay on for weeks and not lose any pressure.
nosila, March 2010
you have a water leak, most leaks are more evident when the system is cold

Ian, March 2010
Might be air in the system
Bleed air out radiators
Bleed any air out of closed loop

Maurice, March 2010
link Click here to see other fixes for Britony Combi SE.