HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

I am trying to troubleshoot a sudden problem with my York

Customer Question
Hello, I am trying to...
Hello, I am trying to troubleshoot a sudden problem with my York furnace. Furnace has been inactive for a couple weeks as we are moving from cooling to heating season. A/C was working fine a few weeks ago and I went to bump the heat the other morning when it got chilly and I am getting no response from the furnace at all. Thermostat seems to be calling for heat/cooling as required but I cant even get the blower fan to come on manually. Don't seem to be getting 24v power back to the thermostat. How can I tell if the transformer is possibly bad?
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 4 hours by:
10/20/2015
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,528
Experience: Furnace, A/C and heat pump specialist.
Verified

Troubleshooting often requires meters and test equipment.Do you have a multi meter for testing voltage? If not you can get an inexpensive one at Walmart for about 15 bucks, if you have or would like to obtain a meter to troubleshoot , I will be happy to guide you.Without a meter , there are a limited number of things we can check if you are able to do a visual inspection and can do some hands on troubleshooting.Please let me know and we can go from here

Ask Your Own HVAC Question
Customer reply replied 2 years ago
I do not have a multi meter but could obtain one. I do have a voltage tester that just simply detects the presence of voltage. There are four wires on the transformer (which is 120v/24v). There are two larger wires coming from the control board terminals marked XMR which I presume are the 120v side and two smaller wires that lead to a wire harness back on the control board which I presume to be the 24v. Assuming that the voltage tester detects down to 24v, I tested the red wire on my thermostat and I get nothing. I tested the 4 wires on the transformer and the tester indicates voltage on the two larger wires but only on one of the smaller wires (the blue one but not the black one).
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Those little light testers usually will not light up with 24v.. Lets do this.

Take a jumper of some kind and jump R to W )(thermostat wire connections)on furnace control board and see if heat will come on and R to G and see if fan will come on.

http://i.imgur.com/JprQdYv.png

Ask Your Own HVAC Question
Customer reply replied 2 years ago
I am at work now and don't have access to the furnace. I did try already to jump the R and G wires to bump the fan but I did it at the thermostat, not the control board. Would it make a difference?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Should be the same unless we have a break in control wire between tstat and furnace.Depending n model of furnace you may have a small 3 or 5 amp fuse on control board that could be blown.If you can grab a meter on the way home we can troubleshoot.Keep I mind though that if fuse on board is blown or thermostat is burned up, there could be a short somewhere that caused it to pop.Simply replacing fuse or transformer may result in burning new one.Short will need to be found and eliminated.Shorts can be difficult to find unless a wire is bare and touching such as being chewed by an animal or hit by a weed eater .I recommend once we find if it is fuse or transformer that we get several fuses for troubleshooting.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
I could not find any fuses inside the furnace itself on or near the control board. Is that common? Would there be a fuse inside the transformer itself?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Older furnaces did have the fuse on the board .It is a good possibility transformer is bad if we have voltage to transformer, but nothing will come on. I recommend we put a fuse in one of the low voltage wires when we replace it just in case there is a short. Get a pack of 3 or 5 amp car fuses .See below:

http://i.imgur.com/Aqd9O0f.png

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Roger that. Should we do some more troubleshooting before I actually buy a transformer? Where could I buy a transformer if that is what is needed?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I like to troubleshoot and verify .If you can grab a meter,that would be best.AS for transformer and the fuses, you can get at any appliance parts store that sells washer,drier and refrigeration parts.A standard 40VA 120/24v transformer should be less than 20 bucks and a box of fuses as shown about 5 bucks.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Will do. How late will you be available for live chat this evening?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

I am usually in office until 9 or 10

Ask Your Own HVAC Question
Customer reply replied 2 years ago
Thanks. I will ping you later.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Sounds good.Look forward to working with you

Ask Your Own HVAC Question
Customer reply replied 2 years ago
okay Airheatman, I am back with multi-meter in hand. Are you available to continue our chat?
Customer reply replied 2 years ago
York model P3URD12N07501A
Customer reply replied 2 years ago
FYI, I also have owners manual and wiring diagrams if that helps.
Customer reply replied 2 years ago
120v confirmed on white & brown. reading 0 on black and blue
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok transformer is definitely burned up then. I would put a fuse in one of the low voltage wires when replacing. Also look good for any chewed or cut marks on control wire between furnace and thermostat and outdoor unit and furnace.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
I did check the wires out to the A/C unit before dark and all looks/feels good. I also don't see anything on the wires inside furnace or on the thermostat wire that I can get to. What else would cause a transformer to go bad?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Power surge, wires touching somewhere, wires connected wrong at thermostat, or a shorted component such as contactor,thermostat or fan relay.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
okay. I will try to find a transformer tomorrow and replace. I did get some fuses and an inline fuse holder today so I will put that on as well. I assume that if there is a different problem somewhere else after that, the fuse will blow before the transformer burns out?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

That is correct fuses are much cheaper than transformer is why I like to have the fuse inline.

Ask Your Own HVAC Question
Customer reply replied 2 years ago
If for some reason the transformer does not work or the fuses continue to blow, can we still pick up this chat tomorrow and continue?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Absolutely

Ask Your Own HVAC Question
Ask airheatman Your Own Question
airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,528
8,528 Satisfied Customers
Experience: Furnace, A/C and heat pump specialist.

airheatman 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
We have a York furnace. We have no heat. The fan is working
We have a York furnace. We have no heat. The fan is working but the burners will not fire. … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,090 satisfied customers
I have a York furnace that has been operating erratically
I have a York furnace that has been operating erratically for about a week, although sometimes it operates fine, at other times it will do the following:Calls for heat but the inducer motor will not s… read more
airheatman
airheatman
HVAC Technician
8,528 satisfied customers
We have a rooftop York furnace model D1NH03N05606C. We
We have a rooftop York furnace model D1NH03N05606C. We recently had to turn the gas off to the house and now the heater is not working. We assume this is a pilot light issue but don't know where to fi… read more
airheatman
airheatman
HVAC Technician
8,528 satisfied customers
How can I tell I my York furnace control board is the cause
How can I tell I my York furnace control board is the cause of the furnace not completing the heat cycle. It shuts down and give me the pressure sensor/switch code but two tech's have been out and ver… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a York furnace Model #P3UCD20N09101A. The thermostat
Good morning Pearl, I have a York furnace Model #P3UCD20N09101A. The thermostat calls for heat and the ventor motor comes on and the igniter lights but I get no flame. Any ideas? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
This is the same guy with the Goodman furnace control board
Hi, this is the same guy with the Goodman furnace control board / transformer. My plumber said what caused the board to fail was a short in the blower motor from water from AC unit backing up into blo… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Just put new control board in a YORK furnace the same issue
Just put new control board in a YORK furnace the same issue occurs. I have no voltage off the 2 eac leads on the board … read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
347 satisfied customers
I have a York furnace and ac and both stopped working when
I have a York furnace and ac and both stopped working when the landscaping crew hit a wire at the ac unit … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I have a Goodman GMNTE120-5 It has a furnace/control board
I have a Goodman GMNTE120-5 It has a furnace/control board with this part number B1809925two of the wires have come off two connectors, and the wires are the same color - trying to determine if it mat… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I recently replaced my furnace control board. The furnace is
I recently replaced my furnace control board. The furnace is a Lennox G40-OUH and the control board was a White Rodgers 50-A65-121-07. The only replacement was a White Rodgers 50A65-843 Universal Boar… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have an amana furnace control board with an led flashing 3
I have an amana furnace control board with an led flashing 3 times … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a York furnace that was working fine and it stop
Hi I have a York furnace that was working fine and it stop working lastnight it has a 7 time blinking green light. Also when I was checking Inotice that a wire from a separate transformer was lying on… read more
airheatman
airheatman
HVAC Technician
8,528 satisfied customers
York furnace blinked 12 times but no ignition. They were
York furnace blinked 12 times but no ignition JA: Did you check the furnace's filters? Customer: yes they were dirty so we cleaned JA: Do you plan on doing the work yourself? Customer: yes JA: Anythin… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
6,730 satisfied customers
I need help with my -Rodgers furnace control board 50e47-060
I need help with my White-Rodgers furnace control board 50e47-060 on a Trane furnace. It has a blinking red light. On the unit it says " steady red light- replace control, blinking red light-referred … read more
type2technician
type2technician
253 satisfied customers
I have a nordyne KG7TC-080D, with a furnace control board
I have a nordyne KG7TC-080D, with a furnace control board #624790/920916. this is a 2-stage upflow unit. Furnace ignites but goes out wihin seconds. flame sensor replaced, still the same issue. Has in… read more
airheatman
airheatman
HVAC Technician
8,528 satisfied customers
York furnace showing Ignition Lock, not staying on, any
York furnace showing Ignition Lock, not staying on, any quick trouble shooting … read more
airheatman
airheatman
HVAC Technician
8,528 satisfied customers
My York furnace with Rodgers 50A50-241 attempts to ignite
My York furnace with White Rodgers 50A50-241 attempts to ignite but fails after a couple of seconds. After about about 5 attempts the blower starts and blows cold air and the red blinking light flashe… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My furnace control board light is not coming on. Yes, the
My furnace control board light is not coming on. JA: Did you check the furnace's filters? Customer: Yes, the furnace filter is new. JA: Do you plan on doing the work yourself? Customer: Yes. JA: Anyth… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 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