Trane XE-70: no heat

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Old 02-02-16, 05:15 PM
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Trane XE-70: no heat

I have a Trane XE 70. When I turn the heat on the internal element heats for about 15 seconds then shuts off and a red light flashes on the diagnostic indicator. Can I fix this?
 
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Old 02-02-16, 05:26 PM
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Welcome to the forums.


We're going to need the full model number. It's on the sidewall inside by the burner.

It sounds like your furnace uses a hot surface igniter to light the pilot. You may have a plugged pilot orifice, a defective pilot gas valve or a control board issue.

If you see the red LED flashing..... count the flashes. There should be a chart of the flashes nearby.... possibly on the back of the blower door.
 
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Old 02-02-16, 06:24 PM
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Full model #TUN100A960B0. I shut it off since I did not know what was going on with it. I will have to fire it back up to count the flashes. I'm guessing around 8 and I don't see any kind of index.
 
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Old 02-02-16, 06:40 PM
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I was way off. I stopped counting after 300 flashes. The unit has done nothing since the failed lighting attempt, except flash red.
 
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Old 02-02-16, 06:53 PM
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As usual I'm having a hard time finding info on your Trane.

It should use a control box like in the picture. What is the number on yours ?

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Last edited by PJmax; 02-02-16 at 08:34 PM. Reason: updated ignition module picture
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Old 02-02-16, 07:28 PM
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50E47-60 same brand as the photo.
 
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Old 02-02-16, 08:33 PM
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I changed the ignition module picture in my previous post.

This is the link for the service info for your ignition module. You basically need to remove the two leads in the MV position. Connect a voltmeter set to AC voltage to those two terminals. Turn the furnace on..... the igniter should glow and in about 15 seconds..... just before or at the same time as the igniter turns off you should read 24vac.

If you do the gas valve or the gas valve wiring has an issue.
If you don't get that 24vac then the ignition board is defective.

The board will cycle the igniter three times before going into lockout. Keep the meter connected thru all three cycles.

emerson climate/Documents/White-Rodgers/catalog/pg0278_281.pdf
 
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Old 02-03-16, 08:29 AM
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Ty PJmax. I will try that today and let you know the results.
 
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Old 02-08-16, 07:00 PM
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I installed the new ignition box today and so far so good. Thanx again.
 
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