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I'm looking at an infinity series carrier system with the 4…

Customer Question
I'm looking at an...

I'm looking at an infinity series carrier system with the 4 wire connection terminals "a,b,c, and d" could you tell me what the letters correspond to? The thermostat says indoor communication error and I'm not used to this wiring configuration

Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?

I think it may be specific to the stat

Contractor's Assistant: Do you plan on doing the work yourself?

Yes I'm the technician on the call

Contractor's Assistant: Anything else we should know to help you best?

The system appears to have adequate refrigerant charge, solid ***** *****ght on control board in furnace, no water in drain pan

Submitted: 24 days ago.Category: HVAC
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Answered in 4 minutes by:
5/26/2018
HVAC Technician: Gaztech, HVAC Technician replied 24 days ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 886
Experience: Owner at Gaztech
Verified

Hi I am Gaztech1, a independent technician, I will assist you with your issue.

Don't forget to rate the 5 star rating AT THE TOP OF PAGE when we are done. this will credit me for assisting you.

A B C D corresponds to electronic signals that come from the control box that comes with T-stat, and isually mounted on the furnace or duct.

You cant jumper any wires at t-stat

The usual wires you are used to are hooked up to the control box from furnace control board.

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