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

    Feb 1, 2009, 06:26 AM
    Only 3 out of 4 elements heat up in my furnace but all 4 are good?
    Only 3 out of 4 elements heat up in my furnace and all 4 are good what's wrong ?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Feb 1, 2009, 06:29 AM

    If all are good, then it would be wiring, connections? Try swapping a good and a bad, then see which one fails, the same Element, or the same location?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Feb 1, 2009, 08:58 AM
    One of your units heat sequencers is probably defective no allowing the one heater to come on.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Feb 1, 2009, 10:45 AM
    How did you test the elements, to arrive at the conclusion that they are good? A clamp-type ammeter will reveal which elements are working, and a voltmeter will reveal where power is being interrupted to any that aren't. Heat relay/sequencer, power wiring, limit control, fusible link, broken heater string, or power supply/fuse/circuit breaker are the possible culprits. You may also check the control wiring for the possibility that the relay that controls the element in question isn't even hooked up.
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