House thermostat / heat stuck on
Well- this is interesting...
Sitting on the couch, realized I felt hot.
Walk over to thermostat, set point 68, current temp- 76!!
I turn the slider switch to off and after a moment it shuts off as niormal.
Slide it back to heat, and it fires back up.
Popped the cover off to see if I can see a relay (box) that I can try to wack. Don’t see anything.
I’ve never messed with a thermostat in a house before. Ugh.
Guess I know what tomorrow’s project is.
Josh 
cowgirl1 
Caged Animal 
steven I had a similar issue a couple of weeks ago - if you have multiple zones make sure none of them are stuck open - you can have that issue even if nothing is calling for heat
Skippy I don't see a low battery indication if the model supports it (you should be able to Google it and get the online manual to see). Multizone systems are more complicated as Skippy mentioned, but if you don't have multiple zones then it might be time to get a new thermostat.
iJay Turning the thermostat to OFF (and it working) proves continuity between the thermostat and furnace's fan relay switch. does the thermostat show a call for heat when the room temp has been reached +2 degrees? ergo if it's 77 and you put it to 80 does it turn off?
I always unplug or remove the batteries from anything electronic that isn’t working properly. Usually I leave it for a half hour. Lots of times it works. Worth a try
Quiet one Before calling any HVAC service, remove old batteries, wait at least 15 minutes and replace them with new lithium batteries. My sister-in-law just paid $350 for new thermostat plus installation /service call fee, gave old thermostat to us, we changed batteries and it works great.
Lena 
mac 
JeffersonRepub The photo of the stat is blurry a tad bit, but It looks as if the red jumper wire from R to Rc is very close to the W1 terminal screw, and may be touching which will bypass the stat, and jump to the heat. That white wire on (w) looks very close to the R jumper wire. If not, change the stat.
Embryodad Check the zone valve not sure which you have. Honey-wells have a slider underneath to manually open the valve. If there is no resistant when you push it towards open when the thermostat is NOT calling for heat. Most likely it is the valve or hopefully just the motor in the valve. Most motors are replaceable without changing the full valve. Motors fail leaving the valve stuck in the open position.
GrascalWhat everyone above said, plus I'm not liking the way the right side of the Blue wire is secured on the screw. There's too much tension on the wire and it could be shorting out against something it runs over top of. It should come in from the top left of the screw, which would create slack in it. As it is now, it looks as though there's backwards tension on it and the wire is folded backwards right at the screw, which is never good.
Best of luck!
Phil D. Do you have a switch by the furnace? Try. Turning it off wait a few minutes and turn back on. Although not the same problem I have had this has worked for me
Leslie Riley said,"What a revoltin development dis is! " "1950's, The Life Of Riley Show!"
Unless your electronic thermostat is indicating low battery, the likely cause is a stuck valve or valve powerhead. Not the most expensive repair.
Natalie #1 ..... There was no statement that the system had a zone valve. ????
#2 ..... There was no indication from the original Poster, what kind of system it is??
#3 ..... If by shutting off the t-stat, the heat finally stopped, is an indication the heat relay in the t-stat may be stuck.
#4.....( By setting the system switch to OFF, it removes control power from heat / cool operations ) The fan can be turned on manually if required; even with the system switch in the OFF position.
"#1 ..... There was no statement that the system had a zone valve. ????"
Maybe he doesn't even know what a zone valve is?
"#2 ..... There was no indication from the original Poster, what kind of system it is??"
Maybe he doesn't know that either, maybe he just knows "I turn the thermostat down, but the heat won't turn off"
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