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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22624
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Have a Heil furnace it keeps blowing the 5 amp fuse in the

Customer Question

Have a Heil furnace it keeps blowing the 5 amp fuse in the AC mode. Any idea why?
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


my name is Billy.

The biggest cause of this is the small wiring at the outdoor ac unit. There is bigger wire in conduit for 220v...and there is a thermostat wire from furnace to turn it off and on...this small wire can get chewed, weedwacked or damaged and cause shorts.

That is the case 90% of the time.