HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

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: 23,037
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
Was this answer helpful?
Ask BillyHvac Your Own Question
BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,037
23,037 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

6,938 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
Carrier Weathermaker 8000 is not working. Help.
My Carrier Weathermaker 8000 will not start the furnace. The fan blows but it stops and never fires. It has error 13. 1 blink, then 3 blinks. House is cold and I need to fix ASAp. Any help?… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
We have a system malfunction message on our thermostat, and
We have a "system malfunction" message on our thermostat, and it appears that our air has stopped running. How can I find out what the malfunction is?… read more
Kenton Guidry
Kenton Guidry
HVAC Technician
Vocational, Technical or Trade Scho
963 satisfied customers
I have a Carrier Thermostat thats flashing HP and not responding
I have a Carrier Thermostat that's flashing HP and not responding when I push any of the buttons...what should I do?… read more
Wvfan79
Wvfan79
Mecanical Designer & Estimator
High School or GED
775 satisfied customers
What Carrier thermostat will replace a Carrier Thermidistat
What Carrier thermostat will replace a Carrier Thermidistat installed in 2000? I want an exact functional replacement. … read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
I have a carrier infinity. Trying to wire a Honeywell
I have a carrier infinity. Trying to wire a Honeywell thermostat to the unit At the heat unit found wires at the abcd nest. But they have two wires to each connection. Do I transfers all to the other … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Have a carrier infinity 25hnb624c0031203o that is giving me
have a carrier infinity 25hnb624c0031203o that is giving me an error 179 - How do I fix this? … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
23,037 satisfied customers
I bought a used carrier infinity thermostat. Installation
I bought a used carrier infinity thermostat. Installation seemed easy, but the screen won't light up, though it beeps. Is there any way to test the unit?… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,938 satisfied customers
My Carrier Infinity. Touch Thermostat is in Lock mode. It is
My Carrier Infinity JA: I'll do all I can to help. How long have you been dealing with this? Customer: Touch Thermostat is in Lock mode. JA: Just to clarify, do you think this is a larger HVAC problem… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
WHAT IS THE BELT SIZE FOR CARRIER MODEL: 40RUAAO8A2A6AOAOAO,
GOOD DAY, WHAT IS THE BELT SIZE FOR CARRIER MODEL: 40RUAAO8A2A6AOAOAO … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
While attempting to adjust the temperature on my carrier
While attempting to adjust the temperature on my carrier infinity control, the indicator screen went blank. It seemed to occur when my finger touched the +/- control and there was a shock of static el… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
How does the cover get removed on a Carrier Carrier
How does the cover get removed on a Carrier Carrier TSTATBBP2S01B thermostat so I can replace it with an Ecobee? … read more
hvacdave84
hvacdave84
53 satisfied customers
Have Carrier fan coil unit model FV4CNB003. Have Carrier Fan
Have Carrier Fan Coil unit # FV4CNB003. Seemed to run and change speed during operation. Is this normal? … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
How to replace Carrier thermostat to a Honeywell thermostat
I just purchased a Honeywell RTHL2410C thermostat to replace an expensive Carrier thermostat that no longer works. The Carrier thermostat only had a red wire (V+) and black wire (Vg) attached to the w… read more
Tom
Tom
HVAC Technician
Vocational, Technical or Trade Scho
770 satisfied customers
My Carrier Split A/C wont turn on and only a continuous green
My Carrier Split A/C wont turn on and only a continuous green flashing light is showing on the front panel of the unit. This is all happened after a power outage… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
how do I reset my limit rollout switch on my Carrier Heate
how do I reset my limit rollout switch on my Carrier Heater?… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
23,037 satisfied customers
The yellow purge light is flashing on my honeywell zoning system.
The yellow purge light is flashing on my honeywell zoning system. Can I reset it by pushing the boot button ?… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
My Bryant furnace keeps shutting off. What could be wrong?
My Bryant (Carrier) Plus 90 furnace, model 398AAW036080D shuts off after running for a bit. I can reset and it will come back on, but always shuts back off, so I assume it is sensing a problem during … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
23,037 satisfied customers
My Carrier furnace keeps shutting down and shows code 34
I have a Carrier 58PAV090 furnace that is about 7 years old. It wouldn't turn on (although it has worked this season), so I pulled the two panels and then put them back on. It tries to start up, but t… read more
Jason Martin
Jason Martin
Maintenance Supervisor
Vocational, Technical or Trade Scho
88 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