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    gpeck's Avatar
    gpeck Posts: 14, Reputation: 1
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    #1

    Mar 7, 2008, 07:03 AM
    Thermostat that goes blank
    We got Honeywell thermostat that goes blank, digital screen, while the heat is on. If we want to increase or decrease the level we have to push button several times and wait until the display comes on and then we can change the setting.
    Is the thermostat bad? Why it would go blank?
    :confused:
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Mar 7, 2008, 07:59 AM
    Does it have a battery in it in need of changing?
    gpeck's Avatar
    gpeck Posts: 14, Reputation: 1
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    #3

    Mar 7, 2008, 11:13 AM
    No batteries. It seems it goes blank whenever is set to 67F. At other settings is fine.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #4

    Mar 7, 2008, 11:27 AM
    Buy a new thermostat,, or avoid setting it on 67 degrees
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Mar 7, 2008, 02:55 PM
    Some Honeywell thermostats in the past had problems with the display as they got older. Honeywell still makes one of the best thermostats available.
    gpeck's Avatar
    gpeck Posts: 14, Reputation: 1
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    #6

    Mar 7, 2008, 10:35 PM
    It is a good thermostat, easy to maintain and so far worked for the last 9 years. Summer is coming up and so we'll be using different settings. We'll see how that works.
    Thanks, George
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #7

    Mar 8, 2008, 06:59 PM
    If a limit switch opens up on the system it will kill 24volts going to the thermostat. A main limit will open because of high temps inside the unit and then reset after it cools back down. Some reasons for the main limit tripping--- dirty filter,dirty evaporator coil,supply vents shut off or restricted,blower set on to low of a speed or blower wheel dirty.
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