It has been my experience that the screen is damaged. You will most likely have to replace the thermostat. I have seen where heavy scratches will cause this condition.
SOURCE: honeywell round mercury thermostat - heat not coming on
If you tip the mercury switch so that it makes contact and the furnace
doesn't start, it isn't the t-stat. Check the connections, then
start checking the furnace.
In any case, ditch the mercury t-stat (recycle it properly) and get a
new programmable one if at all posible. It will pay for itself
many times over by turning your heat down in the middle of the night
and back up by morning.
SOURCE: honeywell thermostat
If you lost the manua, you can go to their site and download it.
Hard to help more without a model number. Sorry.
Geno
SOURCE: Honeywell thermostat won't regulate temp properly
Is there a setting on your thermostat that makes the unit stay on for 10, 15, 20, 25 minutes after you reach set temp. You can change this setting by looking at your manual for the thermostat. Not sure if there is one for this thermostat but mine has one. Mine was running 15 min after set temp and making it cool down 2 degrees lower than set temp. Hope this helps.
SOURCE: The thermostat worked correctly for months then
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
SOURCE: screen frozen TH8320U1016 honeywell
I got mine to work! Mine is the th8110u1003 and although the screen seemed to display, it was completely unresponsive to touch. Long story short, there is a flat watch battery behind the screen. Get to that and remove it for 15 seconds and reassemble. It powered right back up!
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