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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 13986
Experience:  15yrs in the HVAC industry with certificates and degrees.
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Carrier 5a fuse on hybrid 48z unit. Blew again after a few

Customer Question

Carrier 5a fuse blown on hybrid 48z unit. Blew again after a few hours. Replaced with 7.5a and ran for 5 hours and 3 calls for heat then blew. .is it a relay that needs replaced? If so, What part #? Or would 10a fuse be within SF of design to not cause damage?
Submitted: 10 months ago.
Category: HVAC
Expert:  HVAC Guru replied 10 months ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond sometimes I get your replies late so there may be a delay in my response.

You have a short in the low voltage wiring somewhere. You have a wire that might have rubbed through to ground or another wire. I would check the thermostat wires carefully. If they are all good the main contactor relay could be drawing too much current. I would not put a higher amp fuse in it or you will melt a wire.

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