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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22426
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: 10 months ago.
Category: HVAC
Expert:  BillyHvac replied 10 months 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.