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The 3 amp fuse on the control board of my furnace blows often when the heat comes on and immediately when the A/C comes on. I got a new thermostat. Can the blue and yellow wires for the A/C be switched and cause this? Any other suggestions? Thanks, Jared

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Yes if the wires are on the wrong terminals the fuse will blow.
Also any short circuit of any wire will cause the fuse to blow.
The yellow wire is typically for the compressor contactor to engage.
The blue wire is typically a neutral wire.
If blue is touching any other wire and it is the neutral wire the fuse will blow.

Posted on Oct 17, 2010

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