How do I " snap off" the cover of my Honeywell Thermostat to see if I need to replace the battery? The digital numbers don't show anymore and I am getting cold! I don't want to force the cover off and potentially break the plastic.

likely the thermostat batteries need to be replaced. Honeywell typically uses 2 AA batteries. Try gently pulling the bottom of the thermostat away from the wall. Once you disengage it from the wall plate, turn it over and look for the battery access panel. Replace with batteries as specified on the cover panel. don't remove the old batteries until you have new ones to install.

No high voltage, bad transformer, blown fuse, tripped float switch, bad tstat.

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Remove the cover to ensure the batteries were installed correctly. If they were, make sure none of the thermostat pins are bent a little cause mis- alignment with the pin-holes in the subbase. When you determine all is good, reinstall the stat to the base and make sure it is snapped securely in place.

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If you have Honeywell thermostat, then model number and AA battery are located on back of device. Replace battery.
Web search your model number and include .pdf in search parameter to obtain product manual, Use Ctrl+f to word-search manual for troubleshoot section. And view manual for illustrations showing location of battery.

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The cover on your thermostat should snap off pretty easily by pulling gently on lower right corner.Remember to not force it,if it does not open you can try one of the other corners. Under the cover there will be either abattery comparment or if it's 9 volt just two wire connector.Replace battery with same size type number and put cover back on.The battery is normally used to keep digital controls working,clock setback times etc. Hope this helps. Thanks

you have to remove front cover. Most times there are little snaps on the sides of cover to undo. Get a smallish screw driver and pry the cover off very carefully. any more questions just get back to me ken

It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

slide switch to cool and press doen button to lower the temp to desired temp. Check thermostat to see if it needs batteries by snapping front cover off. Good Luck

the cover pulls off if it has a green screen then most likely takes batteries if does not light up then no batteries with a small piece of insulated wire jump from green to red if indoor fan does not come on then transformer bad

This means you need to change the battery use your key to open it up the battery compartment is under the top of the box with a slide off cover