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Help! New to gas and having serious problem. Tried replacing Honeywell digital thermostat batteries, tried reprogramming all temps multiple times. Turned off thermostat, gas keepis running temp at 80 degrees. :furious: Finally out of deperation and perspiration, I had shut off the furnace switch. I must leave for work now and I am not looking to waste more costly fuel in having summertime temps in my NY home. Can anyone help?:eek: The gas furnace is a HydroTherm HC-125C, not sure how old.
 

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If all worked ok until you replaced t.stat ...You have the t.stat wired wrong Sending voltage to the gv at all times
 
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