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Any Honeywell thermostats I have come across you slightly tug on bottom of thermostat which disengages it from the wall and lift up. Batteries are then exposed. Replace with new and reverse take-off procedure to remount. If I remember correctly these do have a small battery backup to save your initial settings so you do not have to reset time and program. Can you tell me the complete model number of thermostat or send a picture of it?
First try replacing the batteries. I have a slightly diff honeywell model and it takes 2 "AAA" batteries. The battery holder comes out the side of the unit, just press where it says press and pull out.
HONEYWELL WEBSITE:
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.
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 wirejump from green to red if indoor fan does not come on then transformer bad
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