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    merkbailey5's Avatar
    merkbailey5 Posts: 2, Reputation: 1
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    #1

    Jun 27, 2007, 02:48 PM
    Hot in Texas A/C won't run
    After thawing out frozen connection to unit outside... my unit will not even come on... this house is falling apart, but the thermostat looks fairly new... I have attached pix,
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Jun 27, 2007, 02:56 PM
    I would check 2 breakers at Electrical Panel, and 2 disconnects are not off or tripped.
    If power making it to both units, check 24 volt transformer next.
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member
    		  
    #3

    Jun 27, 2007, 04:41 PM
    Inside unit may have a auto type fuse in the circuit board. Check it also.Is anything working? Inside unit? Outside unit? Any noise at all?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Jun 27, 2007, 04:50 PM
    Listening is a good idea. Have someone switch thermostat from off to cool, and listen for click of relay in air handler.
    Air handler must have 240 volts in, 24 volt transformer must work, and thermostat, and control wiring, for a click. If none, start there.
    gary883's Avatar
    gary883 Posts: 3, Reputation: 1
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    #5

    Jun 27, 2007, 05:56 PM
    How do I check for a bad capaciter . How do I check for a bad starter on a/c central air unit
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #6

    Jun 27, 2007, 08:19 PM
    Does anything happen? To get air, the inside blower must come on, the outside compressor must come on, and it won't run long without the outside fan. If nothing happens, likely it is the 24 volt control voltage.

    You should have 3 capacitors, maybe a single dual one for the compressor and outside fan. You can do a rough check with an ohmmeter. Short the terminals and remove one wire. Connect the ohmmeter. It should show a high resistance that quickly climbs off scale. Open or short, and replace it.
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