More HVAC help needed

[Bad324]

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 problem

The control board computer on the unit was just replaced in the Spring

[Gixxus Christ!]

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.

[Bad324]

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

[zx3vfr]

Fresh batteries?

[Gixxus Christ!]

Ohhh.... yeah check batteries.

[Bad324]

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

[Gixxus Christ!]

You're dumb. Pull it off the wall and open the back of it.

[Bad324]

As soon as I'm home I'll do just that and report back

[Bad324]

So it's definitely not a battery in the thermostat issue

[Bad324]

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

[zx3vfr]

Is the gas running or just the blow her?

[zx3vfr]

Do you have any codes flashing?

[Bad324]

I don't see anywhere codes would be but I'm not sure. Air is blowing but it's not hot

[zx3vfr]

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?

[Bad324]

Nope displays zilch. It's an old ass Honeywell T8000C so no battery and nothing but a Control board

[zx3vfr]

Go out and get a cheap thermostat. Install and see if that works. If it does return it and buy nice thermostat

[Bad324]

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

[Bad324]

Turned out to be a faulty wire when the CPU board was installed that tripped the rollout switch. Back up and running!