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Thermostat no longer showing temperature

I have a Honeywell CT500. It no longer showing the temperature. I tried to turn to on/auto, played with the temp control...Nothing came on. Should I replace the thermostat or is it something more serious with the heater/ac unit? Please help.

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Check for lose wires to the thermostat r a blown fuse in the furnace compartment.

Posted on Dec 19, 2007


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Thermostat does not reach programmed temperature

Have you checked with a thermometer to see if the area is reaching the temp you have it set at? A thermostat has nothing to do with the temp in your house. If you have it set at a temp for Example ( 72 ) and it is not reaching that temp to shut off then you have a problem with your unit or insulation in house. If you set stat on cool at 72 and the house gets down lower than 72 then there is a problem with stat.

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The thermostat works fine for heat, but as soon as I switch it to cool, the air conditioning will kick is but the inside thermostat will not change, causing the air conditioner to run continuously

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Here is a simple way to tell. Remove your thermostat from it's mounting plate, locate the wiring, the red and white are low voltage control wires. Disconnect them from the base and join the two together if the furnace runs you need a thermostat if not it is in the controls to the furnace.

Dec 27, 2010 | Honeywell CT500 Digital Heat / Cool Manual...

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Just installed a honeywell thermostat, but I can't get the clock to set or the temperature to change on it. How do I get the clock to set?

May be your thermosta setting under locked. By seeing your thermostat manual release lock and then you can satrt changing temp setting or clock setting.

Dec 02, 2010 | Honeywell CT500 Digital Heat / Cool Manual...

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Honeywell CT500 Electronic Thermostat showing 73 deg room temp when room temp is actually 77 degs. Can thermostat be calibrated?

Most all the Honeywell t-stats can be calibrated...
check out this tip to find the manual for your t-stat and then how to get into the installer setup program...

Manual Honeywell How to Find Honeywell Manuals


Aug 13, 2010 | Honeywell CT500 Digital Heat / Cool Manual...

1 Answer

Accidentally programming it

Go to
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

Oct 07, 2009 | Honeywell CT500 Digital Heat / Cool Manual...

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