How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Airheatman Your Own Question
Airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7428
Experience:  Furnace, A/C and heat pump specialist.
Type Your HVAC Question Here...
Airheatman is online now
A new question is answered every 9 seconds

This is very strange. So, I have a Trane XE80. My current

This answer was rated:

This is very strange.

So, I have a Trane XE80. My current problem is: There is no gas ignition (or furnace appears to shut down) unless I jump the R/W in the furnace control board.

The story:
A couple of days ago I noticed the furnace did not start in the morning. I checked the breaker and reset it and it came on… no issues. Later that day in the evening, the same problem but this time resetting the breaker did not do the trick. The furnace appeared to start but it was shutting down after a while. This is what I did:

1. Reset the breaker and checked the firing process. The thermostat called for heat, the induce draft motor came on, the igniter glowed, the flame came on but the furnace shutdown 1-2 secs afterwards.

1.1. - I found the flame sensor could potentially be the problem. I cleaned it without removing it with a soft rug and tried again. It worked, once.

1.2. - I read in the forum using sand paper is the way to go to clean the sensor. I removed it, cleaned with sand paper being careful to not damage anything… Put it back on, it did not work. BUT NOW it stops right after the ignitor glows. There is a click, it seems like a call to shut the system down and that’s it

2. The red led blinks normal. 1 blink per second and 2 per second when get a call for heat.
3. Checked the igniter and it was white in the middle. I figured based on some notes from other users this could be the problem. I bought a new igniter and installed it. Same problem. It stops right after the igniter glows. The furnace tried to start twice or three times but that was it. Checked the led for a diagnosis code and same as before. Steady 1 sec blinking.
4. Decided to jump R/W just to cover all basis and it came on… works without problem.
5. Removed the jumper cable and tried again using the thermostat to call for heat. Same PROBLEM again.
6. Jumped the board once again, it works, no problem.
7. Removed the jumper cable, SAME problem. It stalls right after the igniter glows.

My questions:

1. If the problem is the thermostat, why is it able to send the signal for heat? Cables does not seems to be the problem…
2. Is there a problem running the furnace with a jumper in the meantime?

Appreciate your help,

Hello. My name is XXXXX XXXXX I'll do my best to help. Troubleshooting often requires meters and test equipment. Let's get started and see what we can do.
If you can jump the R and W at the board and furnace works fine, the issue is in the thermostat. If this is a battery thermostat, start by installing new batteries as there could be a bleed down from low batteries.
You can leave jumped for a short time , but remember we have no temperature control to shut it down.
Customer: replied 2 years ago.

Hi Tim,


I believe I figured out the problem, I was asking customer support to cancel my request but I see you went a ahead and replied and I thank you for that.


The problem was a flimsy connection, still testing it... will wait for the furnace to cycle a few times but that seemed to be the issue.


With that said, I have another question and it relates to the motor inducer assmebly, replacement part number and advice on how to get that done. Someone was telling me it needs to be replaced as there is some clicking noise when it starts and it might indicate water corrosion...


Thanks again,

This is the motor you will need. You can also Google and possibly find a better price MOT473AB
Airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7428
Experience: Furnace, A/C and heat pump specialist.
Airheatman and other HVAC Specialists are ready to help you

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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. Jimmy Bagley, IA
< Previous | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland

Meet The Experts:

  • Phil


    Mechanical Engineer

    Satisfied Customers:

    Retired HVAC/ Electrical & Boiler contractor. Industrial
< Last | Next >
  • Phil's Avatar


    Mechanical Engineer

    Satisfied Customers:

    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    51 years of experience install design and repair of all makes and models of AC
  • Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    35 years experience, HVAC
  • Matthew's Avatar


    HVAC Technician

    Satisfied Customers:

    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    12 years install/service experience.
  • Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    Retired But have had 30 years on the tools, Ex CORGI
  • Tom's Avatar


    HVAC Technician

    Satisfied Customers:

    16+yrs HVAC/R service. Residential Commerical Industrial