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jballard81 10-31-2012 08:29 PM

Trane XE80 furnace troubles
 
Good evening! Installed around 95/96. This morning I noticed it was pretty cool in the house, and saw that the thermostat had clicked on and i heard the furnace humming upstairs, but the blower didn't turn on. it just kept humming for ~30 minutes.

So i checked the control board and saw 3 steady flashing lights, which apparently mean pressure system or pressure plate problem. however, on a hunch, i resat the plug style connection near the bottom and the heat plate turned right on and after about 10 seconds the blower kicked in. From the research i have done so far, its an 80% chance that the ignition control module is going out. Does this sound about right to you all? I have a multimeter and know how to use it, is there anything i can check to confirm this?

The house was built in 95, and before I purchased in 06, the previous owner had some furnace work done, and i don't have receipts, but i believe the ICM was replaced then. the unit i looked at today was a White Rogers 50A95 (i think... similar at least off the top of my head). I wouldn't be surprised if it had been replaced with a used or refurb unit knowing the kind of person the PO was.

I'm going to keep researching to see if i can find a good trouble shooting process, but if anyone has some pointers, I would appreciate it.

thanks!

ben's plumbing 10-31-2012 08:35 PM

Quote:

Originally Posted by jballard81 (Post 1042094)
Good evening! Installed around 95/96. This morning I noticed it was pretty cool in the house, and saw that the thermostat had clicked on and i heard the furnace humming upstairs, but the blower didn't turn on. it just kept humming for ~30 minutes.

So i checked the control board and saw 3 steady flashing lights, which apparently mean pressure system or pressure plate problem. however, on a hunch, i resat the plug style connection near the bottom and the heat plate turned right on and after about 10 seconds the blower kicked in. From the research i have done so far, its an 80% chance that the ignition control module is going out. Does this sound about right to you all? I have a multimeter and know how to use it, is there anything i can check to confirm this?

The house was built in 95, and before I purchased in 06, the previous owner had some furnace work done, and i don't have receipts, but i believe the ICM was replaced then. the unit i looked at today was a White Rogers 50A95 (i think... similar at least off the top of my head). I wouldn't be surprised if it had been replaced with a used or refurb unit knowing the kind of person the PO was.

I'm going to keep researching to see if i can find a good trouble shooting process, but if anyone has some pointers, I would appreciate it.

thanks!

I don't like to see part changing....yes the board could be going bad..as we are getting older...but maybe you had a loose connection on the plug ..that does and has happened...if its working right...don't fix it ..wait till it breaks...:thumbsup: ben sr

JJboy 10-31-2012 08:36 PM

1- Set the thermostat to FAN ON - Make sure the blower motor is running. If you don't have this option you have set the tstat to cooling to make sure the blower is working properly.
2- Set the Tstat to heat, check if the small fan is running, check is the igniter glow, check if the burners will light.

Let us know

jballard81 10-31-2012 08:36 PM

Quote:

Originally Posted by ben's plumbing (Post 1042097)
I don't like to see part changing....yes the board could be going bad..as we are getting older...but maybe you had a loose connection on the plug ..that does and has happened...if its working right...don't fix it ..wait till it breaks...:thumbsup: ben sr


Sound advice LOL! Assuming it holds up, i will leave it be for now!

ben's plumbing 10-31-2012 08:41 PM

good deal...really some of the pins on the board behind the plug get loose and just removing the plug and pluging it back in does the trick..if it breaks again someone here will help....ben sr

jballard81 10-31-2012 08:44 PM

Quote:

Originally Posted by JJboy (Post 1042099)
1- Set the thermostat to FAN ON - Make sure the blower motor is running. If you don't have this option you have set the tstat to cooling to make sure the blower is working properly.
2- Set the Tstat to heat, check if the small fan is running, check is the igniter glow, check if the burners will light.

Let us know

Turned the themostat to fan on. it turned right on. turned the tstat up until the heat clicked on. (now that I have re-sat the connections it turns on twice in a row now and seems ok... for the time being), but before that... the little fan turns on and keeps running, no ignitor glow and the burners didn't light.

again, now that i have re-attached the connectors, it has turned on twice without fail in a row. but i'm kind of assuming this is an indication that the part is on its way out....

jballard81 11-03-2012 08:01 AM

As suspected, my furnace is already acting up again. Same symptoms: Thermostat clicks heat on, little fan on furnace turns on and that's it. No glow from the ignitors and no blower fan.

How can i confirm that it is the ICM? since the ignitor isn't glowing/heating up, so no gas is being released. Previously, I had re-sat the connections and it worked for a couple of days, makes me think that a solder joint in the old ICM is going cold. I would really appreciate if someone could give me a couple of proper diagnosis steps to confirm my suspicion. I do not like throwing parts at a problem.

thanks!

JJboy 11-03-2012 09:26 AM

Check the exhaust pipe for clogged. Also you need to check pressure switch.

Sent from my iPhone using DIY Forum

ben's plumbing 11-03-2012 05:13 PM

Quote:

Originally Posted by jballard81 (Post 1043737)
As suspected, my furnace is already acting up again. Same symptoms: Thermostat clicks heat on, little fan on furnace turns on and that's it. No glow from the ignitors and no blower fan.

How can i confirm that it is the ICM? since the ignitor isn't glowing/heating up, so no gas is being released. Previously, I had re-sat the connections and it worked for a couple of days, makes me think that a solder joint in the old ICM is going cold. I would really appreciate if someone could give me a couple of proper diagnosis steps to confirm my suspicion. I do not like throwing parts at a problem.

thanks!

check pressure switch hose for obstruction..and check port on inducer motor where hose from pressure switch connects,,,clean with small wire...ben sr

ohman 11-10-2012 03:33 AM

Sorry to ask a related question. We have a Trane XE80 too (not sure when installed). The unit is working fine but today I just noticed that on the top of the unit there were gaps that seems to be left intentionally.. see this photo:

http://s11.postimage.org/8wlebebi7/20121109_084735.jpg

Was that left intentionally? Is that normal? Should I use some sort of tape to block the gap? Thoughts or comments? Thanks!

Houston204 11-10-2012 09:11 AM

It's normal...........

jballard81 11-10-2012 12:39 PM

by the way, my reoccurring problem came back, and i used a test procedure i found on the net and found that while the inducer fan was on when it was calling for heat, the ignitor wasn't getting the voltage from the board. replaced the board and all is well again. thanks all for the help!!!


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