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my boiler keeps running?

My boiler will fire and run but it will not shut off i disconected each t-stat and it still runs. I am out of ideas can you help melting in alaska
ashley, September 2009
I think it is your water flow switch , you did say what make of boiler you have sorry

capitalboilers.co.uk, September 2009
motorised valve microswitch is probably stuck on.

Ian, September 2009