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I'm here with a repeat of a problem I had 4 years ago. (see http://www.heatinghelp.com/forum-thread/130254/Electrical-Problem)
My boiler won't turn on when the thermostats are calling for it. There is a transformer box on the side of the furnace that, if I gently whack it, makes the flue damper open and the boiler will fire. The problem has been ok for 4 years but just started happening again.
Last time I was able to troubleshoot a loose wire inside, and I removed it from a connector and rewired it and it seemed to fix it. I'm kind of clueless as to what to check or how to fix it. Can anyone offer ideas? If I needed to have someone come for a service call, is this something a heating contractor can diagnose and fix or does it need to be an electrician?
Other suggestions from last time were to test the voltage on either side of the transformer and remove and clean the pigtails for the pressuretrol and LWCO. I never did those. I am sort of not sure how to. I have tried whacking the pressuretrol, but that didn't make the boiler fire. Whacking the transformer box did.
Any ideas? Thanks