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How can I fix my Potterton Prima 50F boiler?

When the boiler is switched on it fires up no problem then after about 3 minutes it shuts down, then about 20 minutes later it will fire up and run for another 3 minutes. It did this about 3 weeks ago for a couple of days and then appeared to right itself. Help please!!
Dave, January 2010
sounds like a circulation problem, check the pump

Ian, January 2010
sounds like you could have a problem with the flu? it may be blocked as my boiler was doing the same thing.

john, January 2010
link Click here to see other fixes for Potterton Prima 50F.