How do i remove the Honeywell t8100c thermostat from the wall plate

You need to remove the thermostat from the wall plate to change the battery. Look on the bottom of the thermostat for a locking screw. Loosen this screw with an appropriate screw driver. Then pull the bottom of the thermostat away from the wall plate and then lift up from the bottom. When you put the thermostat back on, line up the brackets at the top of the thermostat with the slots on the wall plate. Then push the thermostat against the wall plate and tighten the locking screw.

The documentation for the Honeywell RTH2300B1012/U is available on the product page: https://www.honeywellstore.com/store/products/5-2-day-programmable-thermostat-honeywell-rth2300b.htm . Click on the Manuals tab. See page 4 (page 6 of the PDF) for removing the thermostat from the wall plate. See page 9 (11 of the PDF) for replacing the batteries and putting the thermostat back on the wall plate. The current link to the manual is https://www.honeywellstore.com/store/images/pdf/rth2300b1012-u-5-2-day-programmable-thermostat.pdf .

I hope this helps.

Cindy Wells

Pull the front display plate off and they are on back of it it jus snaps on and pulls right off

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.

Remove thermostat from wall, leaving base plate on wall.
Model number appears on back of device.
Google search thermostat model in following format: Honeywell xxxx32 thermostat .pdf
Adding .pdf to search parameter will yield product manual.
Also while thermostat is off the wall, change batteries located in compartment on back of thermostat. These batteries must be changed periodically, for example each 3-4 years.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

turn off power to thermostat. should be a small flat head screw located on the bottom of the unit. release screw and lift face from the bottom, out and up. you will then need to identify wiring before removal of back plate unless the wiring is redundant.

If you are asking how to bypass thermostat to make heat work then remove cover plate from t-stat and remove screws that hold base to wall. Disconnect wires to Rh and W and jumper together. This should make heater run non stop. Thank you.

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.

There is a seam around the edge of the Thermostat , a small screwdriver or butter knife should do the trick , if not then its mounted to a plate on the wall that has 4 corners basically...Gently squeeze the bottom and pull the bottom out , they are pretty sturdy and you shouldn't have a problem,...the wall plate may flex a little while doing this

That is actually not the model number. That's some sort of a code on the flip-up panel with the programming instructions, right? You have to remove the thermostat from the plate that holds it to the wall and look on the back to find the actual model number. Yours is probably model CT3200. If so here is a link to the owner's manual on the Honeywell web site:
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0653.pdf

There is a base plate that is screwed to the wall. The face of the thermostat should come off from the base. Usually the batteries can be found back there. Some times a little tug will get it off the wall. Other models have small plastic release clasps that when pushed in will allow the unit to come off.