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    MATTSDAD66's Avatar
    MATTSDAD66 Posts: 1, Reputation: 1
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    #1

    Apr 1, 2014, 12:20 PM
    What would cause my thermostat screen to go blank?
    The screen on the programmable thermostat went blank when I switched from heat to cool with the mode button. I have 27 volts dc out of the transformer and only 13.5 volts dc at the thermostat. The led light blinks two times and then three times and then repeats itself. I have checked the pressure switch and it is clear.
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Apr 1, 2014, 07:20 PM
    You should be reading AC volts, not DC. Measured between R & C you should get around 26 volts. Probably 28 or a bit over. If you do, reinstall the stat. If it is still blank, the stat has probably had it.
    What does that particular blink code mean?
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