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How to change the battery on my thermostat Honeywell t8001c

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The battery is inside the thermostat. There should be screws / or / it will just pry off the mounting base (not the wall). There are usually rechargable batteries inside.

Posted on Apr 28, 2008

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How do I change the battery on Honeywell Thermostat T8001C?


According to the manual for the model series (see link), only the T8002 Model has batteries. They are accessed from the right side of the thermostat. See page 14.
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1431.pdf

Jan 10, 2015 | Honeywell T8001C1019 Programmable...

1 Answer

My Honeywell T8001C doesn't allow me to change the indefinite temperature hold for some reason


It sounds like the thermostat is malfunctioning; the Set should not be flashing at all, only the Hld should show after pushing the hold button.
Do you have a new battery in the unit? Is it set to Heat or Cool? Is it already programmed for current Time/Date and does it have a schedule programmed in already? If you've lost the user manual it's here: https://customer.honeywell.com/resources/Techlit/TechLitDocuments/69-0000s/69-1431.pdf

Jul 06, 2014 | Honeywell Programmable Thermostat Heater

1 Answer

Power company had to shut power off to my community. When power came back on several hours later its still a blank display and does not work. I have turned off and on every circuit breaker I have in my...


cefb7e0c-979f-4b1a-bff6-c84fcbc4c9cf.pngYou will need a meter and test for 24 volts at red and common, if present, you next need to check at yellow and common and green and common, green being fan and yellow being ac outside.
I suspect the transformer is not providing the 24 volt control power to the stat either due to the high voltage or a low voltage fuse has blown on the board usually a 3 amp auto type, beyond this I am unable to offer much help .

Aug 25, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Have the honeywell t8001c thermostat - no batteries - it holds the programming fine but not the date/time - what to do?


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Mar 06, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Trying to replace honeywell T8001C thermostat with new honeywell RTH7600. The old had a brown not used & a blue. On the new unit not sure where they go. Hooked it up with red,yellow,white,green &...


Red is usually hot side of transformer,yellow is for the a/c compressor,white is for heater,green is for the blower fan,now the blue could be energize for heat or the common side for the transformer,brown can also be the common side of the transformer. It sounds like you need the blue wire connected to the common side for the thermostat....but be careful. Some units use this as a energize wire and are not a common. I would find out what furnace model you have then look online and double check what this wire is or you could damage the new thermostat and/or the 24 volt system on your fau. And also always have the power to the unit disconnected so you do not ground a circuit.

Oct 03, 2009 | Honeywell Programmable Thermostat Heater

13 Answers

Honeywell T8001C


Hi, take a look on amazon for replacement, here: Defy Mother Nature with our Best Buy. I hope this was helpful. Cheers

Apr 04, 2008 | Honeywell Programmable Thermostat Heater

2 Answers

Battery backup?


which model do you have ? the 8000/8001 or 8011 the set is different depending on your type of heating system. This model has a memory chip not a battery that saves your settings. So you could be looking at replacing the unit.

Jan 05, 2008 | Honeywell Programmable Thermostat Heater

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