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    Maristo 86's Avatar
    Maristo 86 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 28, 2009, 03:54 AM
    Blank Thermostat
    My thermostat went blank and my heater is not coming on. I replaced the batteries and it is still blank. What do I do
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 28, 2009, 05:39 AM
    First make sure you have 120 Volts going into the furnace.
    If not check to see if the blower door has a switch on it that kills the power to the furnace when the door is removed. Test door switch to make sure it is good.

    Then see if you have 24 volts coming out of the low voltage transformer.

    After these tests report back to this thread with results.
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