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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8514
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Furnace doesn't work after changing thermostat, I'm pretty

Customer Question

Furnace doesn't work after changing thermostat
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: I'm pretty sure I shorted something when installing the nest
JA: Do you plan on doing the work yourself?
Customer: If I can - it's 100 degrees in Dallas today
JA: Anything else we should know to help you best?
Customer: Any idea where I find the fuse on Bryant 80
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.

Hello, tell me which color of wires connected which terminals on the old thermostat, and which color wired to which terminals on the new thermostat.

Did you unplug the furnace when changing the thermostat>

Customer: replied 1 year ago.
Hi Phil - I didn't turn the furnace off when I changed the thermostat and saw a spark when the wire touched the plate
Customer: replied 1 year ago.
I'm pretty sure the install is correct - I have two other Nest and they are all wired the same
Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  Phil replied 1 year ago.

Thanks, ***** ***** most likely blew the 3 amp automotive type fuse in the printed circuit card where the thermostat wires connect (that's inside the blower compartment)

Customer: replied 1 year ago.
That's what I think also - I just don't' know where the fuse is located on the Bryant 80
Customer: replied 1 year ago.
It's the Bryant Plus 80x model
Expert:  Phil replied 1 year ago.

There are two compartment doors on the front of the furnace, remove them both, you will see the blower inside one of them with the printed circuit board mounted on the blower

Customer: replied 1 year ago.
I see two - one requires unscrewing the panel - does that sound right?
Expert:  Phil replied 1 year ago.

The 3 amp fuse is pressed into the printed circuit board it does not unscrew in most has a big 3 on it

Customer: replied 1 year ago.
Don't see it
Expert:  Phil replied 1 year ago.

Remove the entire front panel, there should be no more than 2 screws

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