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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8326
Experience:  Furnace, A/C and heat pump specialist.
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I want to install a wifi thermostat for my Fridgidaire

Customer Question

I want to install a wifi thermostat for my Fridgidaire B3BV-024K-AB system. I know I need a C wire, but there wasn't one labeled on the old thermostat. However, I found a blue wire hidden behind the old thermostat. Is that a C?
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Yes connect the blue to C.then go to air handler and make sure it is connected to 24 volt common there

Expert:  airheatman replied 1 year ago.

The gray control wire is the C or common at air handler.You should have a wire connected to it from the outdoor unit. Connect that blue along with that wire.