Trane XE80 is not generating any heat - control board gives 3 flashes


  #1  
Old 10-12-13, 09:43 AM
T
Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Upvotes: 0
Received 0 Upvotes on 0 Posts
Trane XE80 is not generating any heat - control board gives 3 flashes

Trane XE80 3 flashes

The problem is that the unit doesn't try to do anything in heat mode, there's a series of clicks and then the red led flashes 10 times then 3 times over and over again. According to the chart, that means the the pressure switch sees an error.

However, no fan, no inducing fan, no fire... nothing.

Whats already done so far -

1. I tried to turn on the fan from my thermostat directly, it is turning on but not in auto and heat mode.
2. Everything is running fine in Auto and Cold mode.
3. I have changed the ignition switch that did not help.
4. I have changed the pressure switch that did not help.
5. Cleaned the white hose that goes into the pressure switch.
6. Cleaned the flame sensor.

I'm getting temptive to try replacing the control board with the other furnance to see if this fixes the issue.

Please help-

PS: I have separate furnance for 1st and 2nd floor so that's why end up swaping the ignition switch and pressure switch.

Thanks & Regards,
Sandeep Sood
 

Last edited by talk2sood; 10-12-13 at 10:18 AM.
  #2  
Old 10-12-13, 09:49 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,695
Received 4,103 Upvotes on 3,685 Posts
Welcome to the forums.

The pressure switch sees an error because the draft inducer fan isn't running. When there's a call for heat.....that inducer needs to start first before anything else.

You need to determine if the motor is defective or it's not getting power. You can use a voltmeter and check the motor leads for 120vac after setting the thermostat to call for heat.

If there is power to the motor then then it is defective.
If there is no power then the control board is most likely the problem.
 
  #3  
Old 10-12-13, 10:30 AM
T
Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you for a tip.

May I request you to tell me how to determine if motor is defective via voltmeter? i.e. which terminals to connect by voltmeter.

I have attached a picture of control board for your information purpose.

Thanks again.

Regards,
Sandeep Sood
 
Attached Images  
  #4  
Old 10-12-13, 10:34 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,695
Received 4,103 Upvotes on 3,685 Posts
Determine the color of the two wires on the motor or follow them back to the board.
 
  #5  
Old 10-12-13, 12:37 PM
SeattlePioneer's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2007
Location: Seattle, Wa
Posts: 4,469
Upvotes: 0
Received 1 Upvote on 1 Post
When the thermostat calls for heat it should energize the W terminal with 24 VAC. When that terminal is properly energized, the circuit board should switch on 120 VAC to power up the inducer motor.

So...


Check to see if the W terminal is being energized. If it is, then check to see if you have 120 VAC across the two wires to power the inducer motor.

If you DO have 120 VAC to the inducer motor and the motor doesn't start and run, you have a bad inducer motor.

If the W terminal is energized and there is no voltage switched on to power the inducer motor, you probably have a defective circuit board that needs to be replaced.
 
  #6  
Old 10-12-13, 12:44 PM
T
Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thanks for your help-

The issue is resolved. I just replaced the circuit board with other furnace and tada heat is ON!

The issue is resolved.

Thanks & Regards,
Sandeep Sood
 
  #7  
Old 10-12-13, 01:21 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,695
Received 4,103 Upvotes on 3,685 Posts
Thanks for the update
 
  #8  
Old 01-29-14, 07:08 AM
S
Member
Join Date: Jan 2014
Location: usa
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Trane XV95 Problem - No heat

I'm new to this site and I'm not sure how to post a new problem. My furnace draft motor kicks on and increases speeds and shuts off with out any attempts for iginition. Only 26 mths old. Continues to do this every 2 minutes. Any ideas?
 
  #9  
Old 01-29-14, 07:34 AM
R
Member
Join Date: Apr 2011
Location: nj
Posts: 526
Upvotes: 0
Received 0 Upvotes on 0 Posts
Pj is probably going to move this to its own thread, but either the inducer isn't properly pulling the correct draft, the tubing is clogged, the pressure switch is bad (rarely ever the case) or it could just be the hot surface ignitor is cracked.how long after the inducer starts running does it shut off? A minute? Or seconds?
 
  #10  
Old 01-29-14, 07:59 AM
S
Member
Join Date: Jan 2014
Location: usa
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
After 20 seconds the inducer shuts off. We had a light, dry snow last night and I went outside to check the vent pipes. THe exhaust had a one foot tall stalagtite forming from the ground while the intake had a ice/snow film covering the vent screen. Once I cleaned the intake scrren off the furnanced fired right up. Thanks for the advice.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: