HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

Carrier HVAC LED light is off. No power to thermostat

Customer Question
Carrier HVAC LED light is off. No power to thermostat
Submitted: 2 years ago.Category: HVAC
Ask Your Own HVAC Question
Answered in 19 minutes by:
6/26/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,765
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
hello,
do you have a volt meter so we know for sure where we have power and where we do not?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I don't have a volt meter
Customer reply replied 2 years ago
Do I need to go out and buy one? 30 minutes..
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
no prob...just get cheap one that reads ac volts with 2 leads
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Hi: I bought a Klein Tools Non Contact tester. Tested against working Carrier and It lights up Bright RED, Test on non working Carrier and it beeps twice red. I assume it detect 12 to 48 volts to AC. I test red wires and Black and White wires. Both get a faint beep of and red light flashes twice
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
can you back track to the switch on side of furnace and test? The goal now is to work backwards until find full power
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Ok. So From black power switch I followed all color wires and no signal. I followed black and white wires to silver small silver box connected to main power. There was a faint ping on the volage tester but hard to get. I put the tester on the outside of the small silver box where the main power cable comes in. The voltage is faint. I followed the line and the power picks up as I get farther away from the HVAC and closer to the house.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
have you tested the furnace?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I was testing the furnace in the attict. Did i say that wrong? Should I be outside at the AC?
Customer reply replied 2 years ago
The thermast has no powerSo I assumed Furnace controlled the power
Customer reply replied 2 years ago
Thermast is 24 volt
Customer reply replied 2 years ago
HVAC LED CODE light is off solid
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Ok,
the small silver box..is it a light switch with a round screw in fuse?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
No switch. I'll send a photo
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
can you start at the breaker for the furnace and work towards furnace?
May have to remove covers from junction box if necessary
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Section A with yellow arrow has a faint power signal. Behind that in Section B there is no Power
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
ok, remove that metal cover and test wire (black) direct
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I removed the metal cover around secition A. No signal in the black line or white line
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
thank you
now follow that pipe...go to next point you can check..as you already know you are missing power and we need to find it.
If you know which breaker it is....test there to eliminate a bad breaker
Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
ok
just say when you are not comfortable....
but the wires in the junction box in furnace.....we want to unhook the wires that come TO the furnace.
Then use an old extension cord...cut plug end off and wire white to furnace white and black to furnace black...and then plug into a known working outlet...are you up for this?
Of course just in case we want to cut power to the wires we unhook for IF they become live again.
Can you do this cord bypass?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Ok, It will take a moment
Customer reply replied 2 years ago
What do I do with the light blue cord in the extension cord? I'm cutting the power and wiring after answer
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
lt blue not needed..only black and white
Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
how are we doing?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I'm getting some power pings on unit but still no RED LED
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
is blower door pop out switch taped down?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I'm holding it with my thumb
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Ok,
tape it down.....locate wire that runs from that switch and it goes to circuit board....is there a reading there?.....you may have a power issue that took out the circuit board...
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Yes there is a faint reading
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Thank you.....so even with extension cord plugged into a known working outlet...the board has no light..fuse on board is ok..?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Fuse is ok. It was a 5 amp but I changed it to 3 thinking that would help
Customer reply replied 2 years ago
I've change the fuse before and that worked but not this time
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
it sounds like circuit board is bad...or transformer.
I know this is a pain...but cut power and unhook board and look at back...and smell for a electrical burned smell on board
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I may call it a day on this one. Lots of cables protruding from the board. What is cost of new board you think?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Around $150......sorry but it sounds like you have a issue AND damage as a result.
I really wish you well
Billy
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Excellent help. Take care
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Have a good weekend..if all set just rate service and I will move from active list
Ask Your Own HVAC Question
Ask BillyHvac Your Own Question
BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,765
22,765 Satisfied Customers
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics

BillyHvac 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

6,730 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

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

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

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 have a Carrier furnace from the 80s. In which the blower
in which the blower won't turn off. but the heat does turn on/off depending on the thermostat control … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,765 satisfied customers
My Carrier Furnace goes on but will not stay on,the red
My Carrier Furnace goes on but will not stay on,the red blinking code is 3blinks and pause,3 … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a Carrier Programmable Thermostat and the AC keeps
I have a Carrier Programmable Thermostat and the AC keeps running. Can I reset it somehow or could there be another problem? … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
We just had a new carrier package unit installed on the roof
We just had a new carrier package unit installed on the roof of our townhome. Model 50VLC3630TP. The unit remove was a carrier 50GX036301. The new unit works great but there is a very noticeable low f… read more
hvacdave84
hvacdave84
53 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
I have a Carrier 58MCA080 gas furnace with continuing
I have a Carrier 58MCA080 gas furnace with continuing issues. Need some help diagnosing current problem.… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Trying to identify thermostat wires from an old Carrier
Trying to identify thermostat wires from an old Carrier Comfort Zone to review options for upgrading the thermostat. … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I live in a rental home with a Carrier system Model
I live in a rental home with a Carrier system Model CD5BXA030000AAA, serial #1896X41060. I have A LOT of questions; however, right now, I'd like to know why I am seeing a steady RED light through the … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have carrier c48175d. changed thermostat to honeywell.
i have carrier c48175d. changed thermostat to honeywell. carrier shows green to A yellow to B white to C and red to D. … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,765 satisfied customers
I just moved into a house and it has the infinity carrier
I just moved into a house and it has the infinity carrier thermostat but no matter how many times I tape on it-it doesn't power up for me to set the temperature … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
We have a Carrier A/C with Carrier TP-PRH01 thermostat. Set
We have a Carrier A/C with Carrier TP-PRH01 thermostat. Set on hold, auto, cooling.75 dgr. A/C will run for a while and go dark.Cooling stops. eventually it will light up and cooling will begin and wi… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Just bought a Nest, but it's incompatible with my Carrier
Hi Hi. Just bought a Nest, but it's incompatible with my Carrier Infinity system. what to do? Rewire? Or find a different thermostat? If so, which one? … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I HAVE A CARRIER HVAC WITH A SYSTXCCUIDO1B THERMOSTAT THATH
I HAVE A CARRIER HVAC WITH A SYSTXCCUIDO1B THERMOSTAT THATH NEEDS TO BE REPLACED. DO YOU RECOMMEMD A ONLINE PART. … read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Have a Carrier FB4CNF042 electric furnace, the blower will
Have a Carrier FB4CNF042 electric furnace, the blower will run but the elements will not heat up. The blower motor is a Genteq. … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Is there a battery on my carrier infinity thermostat? The
Is there a battery on my carrier infinity thermostat? … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have a Carrier TP-PRH01-A programmable thermostat but it
I have a Carrier TP-PRH01-A programmable thermostat but it is not WiFi capable. I would like to replace it with a Honeywell WiFi programmable thermostat. Can you tell me which model(s) you would recom… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Transformer (90-T40F3) replacement on a Carrier HVAC. 120VAC
Transformer (90-T40F3) replacement on a Carrier HVAC. 120VAC input White to common Black to power (208-240 capped) Secondary 24V blue/yellow. From the units circuit board connection "C" is brown and c… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Trying to see what my options are to replace a carrier
Trying to see what my options are to replace a carrier infinity stat that is out of warranty and not functioning properly. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,730 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