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bkm2570 06-29-2011 12:17 PM

Low voltage problems!!
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!

beenthere 06-29-2011 06:14 PM

What VA is the new transformer.

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

biggles 06-29-2011 06:37 PM

is the board tagged R and C backwards maybe with nothing connected you should read 24Vs where it connects to the board

hvactech126 06-29-2011 07:56 PM

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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