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Discussion Starter · #1 ·
When I hook up the low voltage to my circuit board on my furnace it drops from 24 to 5. I've tryed 2 differant boards and have a new transformer that reads 24 when not hook to the board. If you can help it would be great. Thanks!
 

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What VA is the new transformer.

Did you try leaving all other low voltage wires off, and seeing what voltage you read.
 

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AKA HVACTECHFW
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sounds like a bad stat or another load that is shorted in the low voltage circuit. I've seen contactors in ac units cause this.
 
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