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hi i am dan, i can help you with this problem. do you know what the error code is that you are reseting?
Ok you said one zone isn't working, how many zones are there? Do you have to reset it to get the hot water to work?
Ok without knowing the error code the only thing that i can think of that would cause those 2 symptoms is too much pressure. Probably from a bad expansion tank. I would check the expansion tank by knocking on it to make sure it has an air charge still
did you still need help with this or did you have any more questions?
ok, not sure what fan your talking about, there are usually fuses for the display but that may not be the problem. there may be a problem with the display. if you have any more question please let me know, if not i would appreciate it if you could rate me on my service by selecting one of the 5 stars and thank you for using just answer.