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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.
What is the full model number of the thermostat, please? What kind of unit does this control?
I'll need model numbers in order to assist. Otherwise, I'd just be guessing. Is this controlling a forced air furnace, boiler, or heat pump? Usually the model number on a thermostat can be found on the back part of the front section of the thermostat.
If you can, please upload a picture of the thermostat. Also, since the thermostat is powered by the furnace, may want to check for a blown fuse on the circuit board of the furnace.
Well, it does seem strange that everything was fine before you changed batteries. Did you install them correctly? You mention a door that pulls out, is this all the way back in?
Thanks for the picture. That is just a standard Honeywell thermostat with Xcel logo on it.
The batteries do not actually power the thermostat, however, they are only there for backup in the event of a power outage. I still think you may have blown a 3 amp fuse on the furnace board.
Yeah, something appears to have gotten damaged on the stat.
Yeah, that's what I said, this is just a standard Honeywell thermostat with an X-cel logo on it (perhaps X-cel energy installed your system?) The thermostat should have a display regardless of the battery condition as the thermostat IS NOT POWERED BY THE BATTERIES! They are only there for backup to hold the program in the event of a power outage. So if you did not take and separate the front and back sections of the thermostat, I'm guessing thermostat got damaged somehow. The fuse would be on the furnace board, down in the blower section.
I haven't lost it, Nick. I am just trying to explain that the batteries whether rundown, bad, or what should not actually affect the display. But what could have happened is in the process of changing batteries, that somehow the fuse blew on the furnace board. The other option is that the thermostat somehow got damaged.
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