Question about Honeywell Programmable Thermostat Heater

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Honeywell dial theromostat.

I hope you can help me.
I have a hard wired (no batteries), round type honeywell thermostat. Very basic type but only 4 years old. I have no a/c in the home, just forced air (gas) for heat.
The problem I have is the thermostat is not giving me any reading at all? Just a blank face (normally shows room temp). I have limited knowledge of working with furnaces but I did the following:
1) Reset the circuit breaker.
2) Pulled face off of thermostat and cleaned best I could.
3) Checked furnace for obvious signs of loose wires, dirty fan, clean filter,etc.
Nothing worked?
Its getting cold in here and I need heat, please let me know what else I can try before calling in a service tech.
Thank you.

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  • enloe Nov 01, 2008

    I have the same problem. It just happened today. I don't know what else to do?

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  • 359 Answers

You need to check the furnace itself for , locate the 24 volt ac transformer inside the unit and see if it is fused some are some not , check to see if you have 120 volt ac in from the source and 24 volt ac out , sounds to me as if you have lost the 24 volts ac which powers the thermostat as well as the furnace pay close attention as to how you remove the wires and make a diagram and you should be able to replace it yourself , once you get it uot goto a heating supply place in your area and let them match it up and this should be a fix ya

Posted on Dec 31, 2009

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I have seen this often with the digital round thermostats, for some reason they tend to just die, in my opinion prematurely. To ensure that this is the case, take the face off the thermostat, and check voltage between your two wires, you should have approx. 24 volts. If not, then it is a problem at the furnace, or in the wire. If you do have the 24 volts, replace your thermostat. Hope this helps

Posted on Jul 11, 2009

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  • 189 Answers

Since you say it has a blank face it must be a digital thermostat. if the power is on to the furnace and the furnace door is on (door switch) and still does not give you a reading. You probably have a bad stat. if you are handy.... unhook the wires in the thermostat. jump the red and white wires together. the furnace should turn on. if it does the thermostat is bad. if it does not turn on its not the thermostat its the furnace

Posted on Mar 28, 2009

  • Lou Barta Apr 11, 2009

    I assume that this is a digital thermostat. Disconnect the wires form the thermostat. Connect the Red wire and the white wire that are coming out of the wall together. This should turn on your heat. BUT keep in mind the furnace WILL NOT shut off untill you UNHOOK the wires. If this turns on your heat, replace the thermostat. I recommend that you do not replace it with the same style. ( that perticular style is not very dependable).

    Good luck.....

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SOURCE: Furnace kicks on every 15 mins

fuanace may be oversized and is short cycling it heats up house to fast it is better when they run longer

Posted on Oct 04, 2009

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