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Posted by Bob Ryan on October 09, 2004 at 05:32:18:
We had a power surge two months ago. It fried my aquastat relay, which I replaced. The furnace works again, but can only be controlled at the zone valves (manually). There seems to be no communication between my thermostats and the zone valves. Did the power surge damage the power supply to my thermostats? What is the power supply to my thermostats? Is it some kind of 24 volt supply? Where would I find it? (I have a hot water heat system. The thermostats and zone valves are White Rodgers). Thanks for any clues. Bob Ryan of Flint, Mich.