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    billg's Avatar
    billg Posts: 2, Reputation: 1
    New Member
    		  
    #1

    May 18, 2008, 10:38 AM
    Nordyne. E1EB-015HA
    Nordyne model E1EB-015HA How do I check the sequencer's and limit switches what are the omh's values or what should be open or closed on the bench, I have the furance and coils on the bench for testing.
    Unit blows transformer in service. Was great before I cleaned the cooling coils above the furance. I got water in the furance below. I have cleaned all componets. Suspect the sequencer's or limit switch. There is a short for sure-- it blows the transformer in about 60/90 seconds. AC unit on the outside of house runs for about one minute and shuts down. Heating coils have contiunity no breaks with meter and visiual

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    billg
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 18, 2008, 12:39 PM
    IF you can get to the sequencer with enough room for testing voltage and feel comfortable doing so, test across M1/M2, M3/M4 and M5/M6 after waiting 2 minutes from call of heat by t-stat.

    You should read 0 vac across all 3 sets and it should remain that way for a few minutes as home warms up

    NOTE you have a low voltage short in order for the low voltage transformer to blow. Add a inline fuse to the transformer so the fuse blows during testing and not the transformer.

    I would look or sound out all low voltage wires. It could be a short in the wall or a short going to the outside unit.
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