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tripping fuse
I have a multi stage heat pump with auxiliary heat, it’s a Carrier system. There is a low voltage (5amp) fuse in the air handler that blows out instantly when I turn it to either cool or heat but does fine when just the blower on. Of course when the fuse is out I have no power at all to the entire system. Is this related to my compressor? Does it have anything to do with the Freon level? I've checked all the connections in and around the thermostat and air handler but I'm totally confused on what my next step should be... any info would be greatly appreciated.
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