Question about Honeywell Programmable Thermostat Heater
Honeywell TH8110U - 4 or 5 years old, worked fine until today. i noticed it was displaying the wrong indoor temp for awhile this morning. now it displays no temp at all and nothing works. will not heat or cool. when i select one of the functions on the display it just turns itself off. clock works. correct day displayed. i can turn the fan on, but that's it. is the thermostat fried or something?
I work alot with the Honeywell thermostats and in the past couple of years I have seen the Vision Pro thermostats have some fail issues. There is a 5 year warranty on these thermostats so you should'nt have to pay for a new one if it's under 5 years old.
Posted on Nov 20, 2009
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Posted on Jan 02, 2017
SOURCE: round honeywell thermostat
Sounds like you have a T86 thermostat...take the round front cover off to view the Mercury switch. Watch the bulb when you change the temperature to a higher setpoint. If the bulb makes contact when rotating it up, and the furnace doesn't go into a call for heat, then it could be the thermostat, wiring, or furnace problem.
Posted on Dec 15, 2013
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