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Old 04-17-2012, 08:23 PM   #16
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Trane XL90 - Blower runs but no heat


Where exactly would these be located, and do I have to turn off the gas or anything before working on them?

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Old 04-17-2012, 08:28 PM   #17
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Trane XL90 - Blower runs but no heat


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Where exactly would these be located, and do I have to turn off the gas or anything before working on them?
these are the white pvc pipes on top of furnace that go to outside...you could start furnace and go outside to see if it has a strong exhaust... for the intake i think you could remove burnner cover ..thats where little port window is... fire up furnace see if it stays running....
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Old 04-17-2012, 08:32 PM   #18
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Trane XL90 - Blower runs but no heat


I'll give it a shot. Thanks for the advice!
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Old 04-17-2012, 08:34 PM   #19
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Trane XL90 - Blower runs but no heat


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I'll give it a shot. Thanks for the advice!
look inside pipe if you can see if something is in there....nest ,bees, wasps.. doesen't take much to shut down furnace... the pipe hooked to little black blower is exhaust....other is intake...
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Old 04-17-2012, 08:38 PM   #20
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Trane XL90 - Blower runs but no heat


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I'll give it a shot. Thanks for the advice!
hey guy i have to run out will be back in 1/2 hr or hour sorry..hang tight others will help as well....ben....
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Old 04-17-2012, 08:40 PM   #21
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Trane XL90 - Blower runs but no heat


Just checked it out. If I turn it on and go outside, the exhaust is blowing strong enough to shoot a leaf off of my hand fro about 6" in front of it, and the intake had enough suction to hold a leaf to it until the blower shut off. After a few 'attempts' at firing up and dying after a couple seconds, it eventually started and stayed going for about a minute or so. I went downstairs to check, and it was running but there was no fire. Thoughts?
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Old 04-17-2012, 08:42 PM   #22
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Trane XL90 - Blower runs but no heat


Take your time. I REALLY appreciate all the help!
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Old 04-17-2012, 08:58 PM   #23
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Trane XL90 - Blower runs but no heat


Given the fault codes for the furnace, the easiest and most likely cause will be a dirty flame sensor. ( eg. flame lock out instead of pressure switch). When the sensor gets dirty (and they all do) when burners ignites, the flame sensor does not read the flame burning properly and it immediately shuts down the gas for a while. A lock out code will start flashing after a number of aborted attempts at ignition.

The thing that you are seeing inside the burner compartment that is glowing is the igniter. Beside the burner that is furthest away from the igniter, is the flame sensor. It looks like a short piece of coathanger wire thats imbedded in a porcelon holder.

Sensor cleaning instructions...
Power to the furnace gets turned off. The burner door gets unscrewed & removed. The sheet metal screw holding the flame sensor gets undone.
Remove flame sensor and scub the wire clean with steel wool. Reverse previous steps and tell us what happens.
This may not be the cause but it is the most reasonable 1st step.

Last edited by how; 04-17-2012 at 09:07 PM.
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Old 04-17-2012, 09:14 PM   #24
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Trane XL90 - Blower runs but no heat


I got the cover off and found the piece you are referring to, but I need a different bit driver to remove it for cleaning (it does look pretty dirty). The local shop is closed so I'll have to get to it tomorrow. Thanks again for the help, I'll update tomorrow!
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Old 04-17-2012, 09:19 PM   #25
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Trane XL90 - Blower runs but no heat


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I got the cover off and found the piece you are referring to, but I need a different bit driver to remove it for cleaning (it does look pretty dirty). The local shop is closed so I'll have to get to it tomorrow. Thanks again for the help, I'll update tomorrow!
again sorry for leaving yes clean flame sensor...if furnace ran for a few minitues then shut down most likely flame sensor....
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Old 04-17-2012, 09:20 PM   #26
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Trane XL90 - Blower runs but no heat


Sometimes with nimble figers and a bit of patience you can clean the flame sensor rod without removing it.
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Old 04-17-2012, 09:23 PM   #27
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Sometimes with nimble figers and a bit of patience you can clean the flame sensor rod without removing it.
I thought about that, but this just gives me an excuse to buy a few more tools
Plus, I always sleep a little better when my girlfriend is cold

Thanks again you guys, I'll let you know what comes of it tomorrow!
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Old 04-17-2012, 09:35 PM   #28
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Trane XL90 - Blower runs but no heat


I never considered the advantages of an intermitantly operating furnace. Kind of blows a hole in my regular furnace maintenance speech.
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Old 04-18-2012, 08:27 PM   #29
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Trane XL90 - Blower runs but no heat


That did it!! Thanks a million for the help you two! One more DIY project under the belt

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