[nairb16003]

Thermostat will not shut down furnace when switched to "off" position, but will shut down when set temperature is met.

[ballengerb1]

What model do you have?

[nairb16003]

Honeywell RTH2300/RTH221

[ballengerb1]

Just to get started this may help RTH2300B I did not recall that you can shut this stat to an OFF position, can you?

[nairb16003]

Yes. On the bottom left side of the thermostat there is a "Heat", "Off" and "Cool" position where you can slide the switch. On the bottom right side there is a switch you can slide the fan to "Auto" or "On".

[nairb16003]

Also the link you posted is the correct thermostat. The picture on that page is the same thermostat that I have. If you look at the bottom right and left of the picture of the thermostat you will see the print of what I was trying to explain on the above post.

[nairb16003]

Well, I guess we can forget all I wrote above. I woke up this morning and only my blower motor was running on the furnace as well as my condenser outside. I shut off everything. Shut off breaker to condensing unit and unhooked my 2 wires from the furnace board that controls the contactor on the condenser. Tried to restart the furnace, but the vent motor comes on for about 3 seconds and shuts down. After a couple more seconds the blower motor comes on. Any help?

[ballengerb1]

I am stumped, maybe time to make a call, sorry

[mygirlsdad77]

Is this a new stat? If so, are you sure it is wired correctly. Let me know if its new, or has been in use and worked correctly before. Also, I need to know if you have a heat pump system, or just conventional forced hot air gas furnace with central air conditioning. Just a heads up, if it's a heat pump, Im afraid I will be of no real use to you. If it's a conventional system, depending on the brand and year, I may be able to at least point you in the right direction. Or, as ballengerb suggested, make a call to a local tech and they should be able to get you fixed right up. Please do let us know either way.

[nairb16003]

I found out the problem! I did some voltage testing on the vent motor as well as the transformer. Then I went to the control board of my furnace and checked the voltage from Red to White as well as Common to Red. I had 24v from R to W, but not C to R. So I took the face off the base of the thermostat and found that a battery had exploded inside. Not sure if something caused this or if the battery was just garbage. Needless to say I went and bought a new thermostat and now have heat! Thank you very much for taking the time out of your day to help!

[mygirlsdad77]

Hey, just glad you got it fixed. Good job, and thanks for the update.