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Discussion Starter · #1 ·
The thermostat is a fairly new digital one that runs on batteries and I have verified that the thermostat is working. I tied the wires on the back of it (to bypass the t-stat) and nothing still came on - fan or A/C unit. I can hear the T-stat click when I lower the temp on it - but that's it. There are no tripped breakers or fuses at the panel. I checked for loose or burnt wires and don't see any.
I am not sure how to verify that everything is getting power as it should. I have a Ducane Gas furnace (blower) that has a Honeywell circuit board on it. I have a multi-meter but am not sure what to test and where.

thanks Rob
 

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test for incoming power at furnace.Test for control power 24v at control board r-c make sure the door switch is in on ducane i believe all you have to remove is middle door section. no power, test incoming on xmfr 120v and secondary 24v. If power is good leaving xmfr look for a small fuse on board.
 

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Discussion Starter · #3 ·
Well, I looked at the circuit board and sure enough there was a 5A fuse that was blown. I swapped it out, the unit came on and then immediatly blew the fuse again.
Any suggestions?

thanks
 
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