Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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My furnace wont start from the thermomstat.i have to push in start button on the panel to kick on.. i have my temp set at 70.. i changed the batteries on thermostat.. but every other day i have to go down in basement to turn the swicth on..from furnace

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I assume this is gas furnace; have you put fresh batteries in the t-stat?

Posted on Jan 13, 2009

  • Glenn Snow Jan 13, 2009

    PS. I also assume that you do not have an a/c unit connected with this system else you would get low voltage from the ac unit transformer which would actuate both the heat side and ac side of the thermostate's contacts and not need to have batteries in the tstat.
    Another area to test is the gas control module. It sounds like the pilot's thermocouple is ok, else the pilot would go out, however, if the stat is getting the signal to the controller that gas is in demand but it will not accuate the valve to give gas to the burner, then the electro magnet actuator in the gas controller may be at fault. Particlarly since it will work with a manual stimulus.

    Therefore, long short, test the tstat then the gas controller circuitry. It would be much cheaper to do a quick test on the tstat by getting a jumper wire and touch it to the two terminals where the tstat would normally complet the circuit when heat is neaded. If you cannot tell where to bridge the circuit, forget it else you can damage the tstat or a transformer.

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I would say that the thermostat needs replaced! (this is the most common problem with the honeywell brand!
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Posted on Jan 13, 2009

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