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    Jimachelp's Avatar
    Jimachelp Posts: 3, Reputation: 1
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    #1

    Jul 18, 2012, 02:59 PM
    AC Transformer Keeps Blowing out
    My home central AC system was not working and I tracked the problem to the transformer. I measured the voltage across the transformer and there was 120 volts on one side and 0 volts on the other which showed it was bad. So, I replaced the transformer and the AC started working. However, it only worked for about 1 week. I checked the transformer and there was no voltage as before. Why would the transformer keep blowing out? The original part number was C6349701 and I replaced it with C6349703. Is this correct? Could the transformer have been bad? We have been having bad weather. Could a power surge damage the transformer?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Jul 18, 2012, 04:23 PM
    Most Central ACs I see use 240 volt transformers, I will see what I can find with those numbers,
    From what I usually see is if you measure for continuity on the primary side and it is open, It may be Primary voltage problem, If secondary opened, you may have a short, on thermostat, control wiring or shorted windings on a relay or contactor.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #3

    Jul 18, 2012, 04:26 PM
    Looks Like the 701, 702, and 703, is basically the same:
    C6349701 Transformer
    It says all 3 are 120 volt primary.
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