Control board fuse keeps blowing


Old 01-25-15, 11:47 AM
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Control board fuse keeps blowing

Don't mean to kick up old threads but i have kind of the same issue except reversed.
I have a Trane XL80 and my 3A fuse only pops when my heater is turned on. AC will run without popping it. It's been running since Oct. and now all of a sudden it's doing it again. I've tried a few things from someone who used to do HVAC but nothing was solved. It had done this before but i thought i had solved the issue, but its back. so any help would be appreciated.
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Last edited by PJmax; 01-25-15 at 12:26 PM. Reason: started new thread
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Old 01-25-15, 12:43 PM
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Sorry J.... that thread was getting too long. So welcome to the forums and your thread.

Last edited by PJmax; 01-25-15 at 07:10 PM. Reason: removed incorrect info
Old 01-25-15, 04:41 PM
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I would snap a picture or 2 of the thermostat wire connections, unwire and remove all thermostat wires from the furnace, then place a jumper wire between furnace R and W to prove if the problem is inside of the furnace.

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