Bad324 Posted October 12, 2014 Report Share Posted October 12, 2014 Turned the heat on for the first time Friday but set it real low at 65*. Woke up yesterday morning and the thermostat seems crapped out. Went in the basement and the blower I'm guessing was still running and blowing out air through the registers. Since it was last set so low I don't know if it's really heating or not. Could it just be that the digital thermometer took a crap on me or do I have a bigger problemThe control board computer on the unit was just replaced in the Spring Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted October 12, 2014 Report Share Posted October 12, 2014 Check the control board for a trouble light. ..if it's flashing then you can look up the code. My furnace did the same thing last winter. There was corrosion built up on the thermocouple that tells the board that the burner is on. Cheap to replace but all you really have to do is polish it up with emery paper. Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 12, 2014 Author Report Share Posted October 12, 2014 So would that keep the thermostat from being powered? Right now the digital thermostat on the wall has no power so can't change temp and off/on switch Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted October 12, 2014 Report Share Posted October 12, 2014 Fresh batteries? Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted October 12, 2014 Report Share Posted October 12, 2014 Ohhh.... yeah check batteries. Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 16, 2014 Author Report Share Posted October 16, 2014 Finally have time to get back to this issue. Am I dumb to assume that the thermostat actually is powered by hardwire? When I had it worked on in the spring the tech made it seem like this was the case Quote Link to comment Share on other sites More sharing options...
Gixxus Christ! Posted October 16, 2014 Report Share Posted October 16, 2014 You're dumb. Pull it off the wall and open the back of it. Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 16, 2014 Author Report Share Posted October 16, 2014 As soon as I'm home I'll do just that and report back Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 16, 2014 Author Report Share Posted October 16, 2014 So it's definitely not a battery in the thermostat issue Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 16, 2014 Author Report Share Posted October 16, 2014 (edited) So to update. The furnace is constantly running if I leave the lower panel on and I have no power to the thermostat Edited October 16, 2014 by Bad324 Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted October 16, 2014 Report Share Posted October 16, 2014 Is the gas running or just the blow her? Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted October 16, 2014 Report Share Posted October 16, 2014 Do you have any codes flashing? Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 16, 2014 Author Report Share Posted October 16, 2014 I don't see anywhere codes would be but I'm not sure. Air is blowing but it's not hot Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted October 16, 2014 Report Share Posted October 16, 2014 If you pull the cover off there should be a green diagnostic light on a computer looking device. So does the thermostat display anything at all? Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 17, 2014 Author Report Share Posted October 17, 2014 Nope displays zilch. It's an old ass Honeywell T8000C so no battery and nothing but a Control board Quote Link to comment Share on other sites More sharing options...
zx3vfr Posted October 17, 2014 Report Share Posted October 17, 2014 Go out and get a cheap thermostat. Install and see if that works. If it does return it and buy nice thermostat Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 17, 2014 Author Report Share Posted October 17, 2014 I broke out my multimeter and it seems the thermostat is not getting any voltage so it's likely something on the control board that was just replaced in June so I'm getting those assholes out again to fix it Quote Link to comment Share on other sites More sharing options...
Bad324 Posted October 18, 2014 Author Report Share Posted October 18, 2014 Turned out to be a faulty wire when the CPU board was installed that tripped the rollout switch. Back up and running! Quote Link to comment Share on other sites More sharing options...
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