I have a HBSmith Boiler, I have not had it turned on for at least a year and a half, at that time I also turned off the water ( the water is high in iron and there is some sediment) to the boiler , I heat with wood but need boiler for the holidays. Temperature goes to over 200 degrees and does not turn off however it does circulate. Is there a temperature control switch that I can adjust? I also noticed, it may not make a difference , the top of the expansion tank gets red hot. I need the Boiler for the Holiday or all my plants will die, my pipes will freeze and break, the basement will flood and the house will float away.

You have more than one problem and I suggest you call for ON Site Service since your situation will not be solved by posting to this board. Sorry