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JA: Thanks. Can you give me any more details about your issue?
Customer: I have a trane Xe 80 furnace and all of sudden the heat is not firing. the Tstat clicks on but not heat. The furnace works because the air and the fan go on I am getting 3 LED flashes in the little view finder
JA: OK got it. Last thing — HVAC Technicians generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: HVAC
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Answered in 17 minutes by:
4/13/2016
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,515
Experience: Furnace, A/C and heat pump specialist.
Verified
The 3 flash code is a pressure switch issue.Does the small vent motor on furnace come on when you call for heat?
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Customer reply replied 1 year ago
No. Nothing
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
OK that motor must come on to pull a vacuum on pressure switch before anything else can happen.Our first step is to determine if we are getting voltage to that small motor.Do you have a volt meter?We would need a meter to troubleshoot. You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.http://www.walmart.com/ip/Innova-3300-Equus-3300-Hands-free-Digital-Multimeter/14644665
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Customer reply replied 1 year ago
Yes. I have a volt meter
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
OK do you see where the two wires connect to inducer fan motor?Turn power off to reset control board.Then power back on and We will turn thermostat to call for heat and see if we get power to the small motor.
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Customer reply replied 1 year ago
I have no idea what the inducer is.
Customer reply replied 1 year ago
I am assuming it is behind the top panel
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Yes, remove top panel and locate the black and white wire where they connect to the vent inducer and that is where we want to check voltage on call for heat
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Customer reply replied 1 year ago
I cannot get to the leads on the wires
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Do they have a plastic plug?
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Customer reply replied 1 year ago
Yes
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Disconnect from motor and stick leads in plug coming from board.All we want to know is if the board is sending the 120v out to motor.
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Customer reply replied 1 year ago
I am able to decouple the plastic connector but still cant get to the leads
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
The leads of your meter should stick into the connector once unplugged.
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Customer reply replied 1 year ago
Crap. What i have is a voltage detector. There are no leads on it
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Yeah we need a meter with leads that tells us exact voltage Walmart sells for about 10 to 15 bucks if you want to grab one.
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Customer reply replied 1 year ago
Ok. I will go out and grab one. Should i reply again once i have it?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Yes just come back to the question and we will go from here.Make sure to get one designed to read AC volts
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Customer reply replied 1 year ago
Ok
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Look forward to helping you figure this out.
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Customer reply replied 1 year ago
Ok. Got the volt tester
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Great lets unplug the connector and put meter leads in the side supplying power and see if we get 120v on call for heat.
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Customer reply replied 1 year ago
So the side coming out of the infuser or the other side?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
The side coming from the control board.There will of course be nothing from fan since it is unplugged.
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Customer reply replied 1 year ago
I am not getting anything. But i may not be doing it right
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Can you attach a photo of where you are checking?
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HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Excellent.You are doing right. Now remember though we must have bottom panel in place or door switch held in to get power.
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HVAC Technician: airheatman, HVAC Technician replied 1 year ago
250 not 25
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Customer reply replied 1 year ago
Not getting anything
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Still getting light on board?
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HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Lets do one more test.Jump the R and W terminals where thermostat wires connect, hold door switch in and see if we get anything.http://i.imgur.com/JprQdYv.png
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Customer reply replied 1 year ago
Yes. One i push the door switch in the red light comes on
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Lets do one more test.Jump the R and W terminals where thermostat wires connect, hold door switch in and see if we get anything.http://i.imgur.com/JprQdYv.png
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HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Take a jumper wore or pair of needle nose and connect R and W
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Customer reply replied 1 year ago
So twist r and w together? Then what?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
No do not twist wires, connect the terminals on board.http://i.imgur.com/JprQdYv.png
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Customer reply replied 1 year ago
I am sorry. I dont get it
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Can you see the image I sent showing a jumper wire from R to W?
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Customer reply replied 1 year ago
Yes. But what do i use to jump them? Do i disconnect what is there now? Maybe this tester doesnt work
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
You can use a piece of wire or use a pair of needle nose pliers to jump.To verify meter is working, stick probes into a known working receptacle plug
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Customer reply replied 1 year ago
Ok so the meter works. Tested it on a battery. So. Do i leave wires connected to r and w? What do i do with the pliers?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
You can leave wires connected. Just touch one side of pliers to R and the other to W.
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Customer reply replied 1 year ago
Ok did that Now what?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Door button In ? If so we should immediately get voltage to inducer
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Customer reply replied 1 year ago
Nothing
Customer reply replied 1 year ago
Do i unplug them?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
NO leave the wires connected to board
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Customer reply replied 1 year ago
Then how do i connect the leads?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Just hold one lead on the XFMR-H and One on the XFMR-N.
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Customer reply replied 1 year ago
On the actual wire or stick it in where the wire is connected?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
On the terminall where wire connects to board.
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Customer reply replied 1 year ago
Ok. I will try. There isnt much room to get the lead in there
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Standing by
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Customer reply replied 1 year ago
I need to step out for a few. Be back shortly
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Just let me know.
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Customer reply replied 1 year ago
I think I have to get another volt tester. The leads don't reach anything.
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
No problem. WE can go from here when ready
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Customer reply replied 1 year ago
never mind. I didn't realize the leads had caps on them. The issue I am not having is I am not able to connect the leads to XMFR -H and N. There is a cap on the wire
Customer reply replied 1 year ago
The only way to touch the leads to them is to unplug them which won't help
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
OK unplug wires then and stick leads into the female terminals coming from transformer.
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Customer reply replied 1 year ago
I am not getting any readings no matter what i do
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
How about the wires going into transformer high voltage side
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Customer reply replied 1 year ago
Something isnt right. Nothing seems to give me a reading on this tester
Customer reply replied 1 year ago
Except sticking it in an outlet
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Is door button held in during testing?
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Customer reply replied 1 year ago
Yes
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Locate the main power wires where they connect to board and see if we have 120v there, Board may be the whole problem
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HVAC Technician: airheatman, HVAC Technician replied 1 year ago
OK sounds like the board is going to be the culprit.Power in but not out of board
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Customer reply replied 1 year ago
Wonderful
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
If you have further questions, please let me know.Thanks for letting me work with you.If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified.To rate answer, please select one of the stars below.
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Customer reply replied 1 year ago
But why does the air and fan work?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Hmm would not expect either to work if no 120 from board to transformer or 24v out of transformer.
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Customer reply replied 1 year ago
Furnace kicked on when i changed the tstat to air
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Furnace as in Heat mode?
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Customer reply replied 1 year ago
Air mode. Would it be a good ide to put the door(s) on at least the bottom and try the infuser power again?
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
Lets try that
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Customer reply replied 1 year ago
No dice
Customer reply replied 1 year ago
So mu guess is the board fried when the power came back on? But that doesnt explain why the ac works
Customer reply replied 1 year ago
I am totally stumped
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
I am suspecting an issue with the board,Might be best to get an onsite tech to verify though before just start changing parts
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airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,515
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Experience: Furnace, A/C and heat pump specialist.

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