Gas and Oil Home Heating Furnaces - prgrammable thermostat trouble

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jtownson
11-29-03, 11:58 AM
in order to do some painting, i removed the mounting screws to our programmable thermostat but left it wired. after remounting the unit and turning on, there is an audible "click" to turn furnace (gas forced air) on, but the furnace doesnt respond: no ignition, no fan. we even bought a brand new thermostat and have it correctly wired. the previous one had worked fine until it was removed from mounting. what can i try now? there are no tripped breakers; furnace is 4 years old. thanks

hvac4u
11-29-03, 12:07 PM
check the furnace for a circuit board that may contain a blade type fuse. it could have blown when tstat was off. does the tstat have batteries?
jtownson
11-29-03, 12:14 PM
the blade fuse looks fine; batteries are good too-- thanks!

hvac4u
11-29-03, 12:26 PM
just a thought, turn power off to furnace for 5 min, it may be locked for some reason. nothing happens at call for heat? does a/c work?
jtownson
11-29-03, 12:54 PM
unplugged unit for about 20 mins; no result. A/C not functioning either.....
hvac4u
11-29-03, 01:22 PM
sounds like we are not getting 24 volts to the tstat, do you have a meter? possible broken wire behind tstat maybe. jump r and w at the furnace, does it light?
jtownson
11-29-03, 02:09 PM
well, our daughter found the problem: she noticed that the GFI switch in the bathroom had somehow been tripped; when she restored it she suddenly heard the furnace kick in--obviously furnace is on same circuit. what a relief--so simple--thanks much for all the suggestions meantime! i'll be sure to use these forums in the future. :D
hvac4u
11-29-03, 02:47 PM
she is a better tech than i....i would have NEVER gotten that one right!