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    claud1's Avatar
    claud1 Posts: 1, Reputation: 1
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    #1

    Jul 28, 2012, 06:55 PM
    Air conditioner will not run and thermostat is blank
    Aircondition will not run and the digital thermostat is blank. Unit was running all day.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jul 28, 2012, 07:07 PM
    Quote Originally Posted by claud1 View Post
    aircondition will not run and the digital thermostat is blank. unit was running all day.
    Check battery and 24 volt transformer .
    TopTechnician's Avatar
    TopTechnician Posts: 9, Reputation: 1
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    #3

    Jul 28, 2012, 07:42 PM
    A blank thermostat indicates a loss of low voltage which originates in your indoor unit. The simplest of reasons would be a blown low voltage fuse or a tripped low voltage circuit breaker.
    It could also be that a safety device has tripped, like a float switch... check to see that your unit is draining properly. Is your unit in the attic? Check for a float switch in the pan under it. Is it in the basement? Check for a condensate pump with a float in it.
    Also check for a float switch on the condensate drain where it exits the indoor unit.
    If any of these are tripped, it could indicate that the drain is clogged.

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