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A/C blows fuse on call for 2nd stage.

I have a two stage furnace and a two stage ac compressor from goodman. My thermostat is compatible with this system. When I run the thermostat on the heat setting, the furnace runs good when the thermostat calls for stage one and stage two. However when I run the A/C setting on the thermostat it runs fine on stage one and as soon as it makes a call for the second stage it blows the 3 amp. fuse on the circuit board. From what I can tell from the schematic this is the fuse to the 24v power supply. This system ran great all last year. So obviously something has changed.

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My guess would be a problem with the low voltage wiring a short have it checked out by an electrician

Posted on Jun 21, 2009

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Posted on Jan 02, 2017

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