HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

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: 2 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 4 minutes by:
5/26/2018
HVAC Technician: Gaztech, HVAC Technician replied 2 months ago
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 937
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.

Ask Your Own HVAC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a hvac technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
7,426 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

7,426 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

1,024 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
I'm trying to wire my new Honeywell lyric t5 to my carrier
Hi, I'm trying to wire my new Honeywell lyric t5 to my carrier infinity hvac system … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I need the wiring diagram to connect a Honeywell thermostat
I need the wiring diagram to connect a Honeywell thermostat correctly to my Infinity 96 system.… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Question for you regarding wiring a carrier infinity with a
Question for you regarding wiring a carrier infinity with a Honeywell lyric. I have a gas furnace and an AC condenser. Today the terminal with the abcd wires connected in the furnace has 2 sets of wir… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My stat is dead (reads any temp it feels like!) I want to
My stat is dead (reads any temp it feels like!) I want to replace it with a newer smart stat. If I follow the rewire advice I just need to know I won't blow out my circuit board. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Carrier Infinity Furnace/ AC system and am trying
Hello, I have a Carrier Infinity Furnace/ AC system and am trying to install a Nest 3rd Gen Thermostat. I have read several DIY threads, but none quite match my setup. Can you assist? … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
I am installing a nest thermostat in lieu of an my
Hi I am installing a nest thermostat in lieu of an my communicating Bryant stat. I currently have ABCD labeled wires. Reading this thread, I understand I can move them in the furnace to RWYG. My quest… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
There. I'm trying to get my Nest thermostat (2nd gen)
Hi, there. I'm trying to get my Nest thermostat (2nd gen) working with a Carrier Infinity system. I've got all the wires plugged in (R, G, Y, and W), but the Nest is complaining that there is no power… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Can I replace my Infinity thermostat with another infinity stat?
My infinity thermostat bit the dust (model # systxccuid01) and am looking to replace it. my question is can I use one of the other infinity stats to replace it. I saw in a forum that the infinity touc… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I'm looking thermostat compatible with A,, C, D wiring,
i'm looking for a thermostat compatible with A, B, C, D wiring … read more
D.E. Anderson
D.E. Anderson
Industrial Refrigeration Service Manager
200 satisfied customers
I have to change my carrier thermostat and have a honey well
I have to change my carrier thermostat and have a honey well thermostat. How do i connect the wires. Carrier has A B C D honeywell has B O G Y W R RC Carrier Letter A is Green B is BLUE C White D RED … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I'm trying to replace a bad Carrier Thermostat with a LUX 7
I'm trying to replace a bad Carrier Thermostat with a LUX 7 day programmable. The letters where the wires go on the Carrier terminals do not match what I have for the LUX terminals.The Carrier had a b… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have carrier 58MVC infinity. It was initially set up with
I have carrier 58MVC infinity. It was initially set up with a single stage Honeywell thermostat. I replaced it with a SYSTXCCUI01-B infinity control. The Honeywell control had the same 4 wire system t… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Currently have Bryant furnace model 355cav and Bryant ac 113a/116b.
Currently have Bryant furnace model 355cav and Bryant ac 113a/116b. I currently have a Bryant evolution stat,the monochrome screen one,that utilizes the proprietary a b c d writing scheme. I would lik… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I HAVE A CARRIER INFINITY THERMOSTAT WITH abcd WIRING, GREEN,BLUE WHITE
I HAVE A CARRIER INFINITY THERMOSTAT WITH abcd WIRING, GREEN,BLUE WHITE AND RED.CAN I CHANGE THIS TO HONEYWELL WIFI THERMOSTAT, DO I NEED A SEPARATE WIRE 24 VAC, TO POWER FOR WIFI . HONEYWELL SAID RET… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
heres my question im working on a residential carrier infinity
heres my question im working on a residential carrier infinity system it has the infinity control on the wall abcd low voltage connections its connected to a carrier infinity air handler abcd d and c … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Carrier, Infinity System, Thermostat. Last night the
I have a Carrier, Infinity System, Thermostat. Last night the display went off, as if the unit was not receiving power. I pulled the unit off the wall, and tested the wires for voltage. There's power … read more
theplumber717
theplumber717
Plumber
Vocational, Technical or Trade Scho
791 satisfied customers
will the amx view stat color communicating thermostat work
will the amx view stat color communicating thermostat work with the carrier infinity system.… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
I would like to hook a Honeywell TrueSteam humidifier to my
I am hooking a Honeywell TrueSteam humidifier to my Carrier Infinity HVAC system. How do I program my Infinity thermostat to activate the humidifier in conjunction with the furnace's fan without the c… read more
Tim H
Tim H
Lead building engineer
Vocational, Technical or Trade Scho
1,922 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x