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    jsf252 Posts: 1, Reputation: 1
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    Oct 11, 2010, 06:29 AM
    Voltage at Defrost Board
    Hello, my A/C and Heat are working correctly after I replaced a faulty defrost board. However I noticed that when I test voltage on all the wires coming from the air handler (yellow, red, green, etc.. ) at the defrost board, I'm only reading ~5.3V. The defrost board says "24V AC". I can test voltage at the air handler and again I get the 5.3V. I looked on the transformer and it even says "24V AC". I'm no electrician but I'm trying to understand this. Is the 24V split up among all the wires? Why do I only read 5.3V?

    Again, everything is working correctly (for now). The A/C worked flawlessly all summer after I replaced the defrost board. I have late 90's Intertherm heat pump system.

    Just curious as to how this works.

    Thanks.

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