Trane furnace trying to ignite while main burners running

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Old 12-12-12, 12:35 AM
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Trane furnace trying to ignite while main burners running

I have a Trane furnace that is routinely serviced. However, I noticed that on occasion the furnace tries to ignite (clicking) while the furnace is running. I don't have any problems with it getting to temp. Sometimes it will shut completely down and in a few mins fire up again and run for a few mins. Coud this be a simple repair? I'm not very familiar with operations let alone repairs.

Thanks in advance
 
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Old 12-12-12, 12:44 PM
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Well, you could try cleaning the flame sensor. That would be a possiible source of the furnace shutting off, and it's routine maibntenance that should be done annually to avoid problems anyway.
 
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Old 12-12-12, 05:57 PM
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Thanks. I will try that and also try and see if I can get a better, more precise description of what is happening in sequence. The furnace is a Trane XE 80

Thanks
 
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Old 12-12-12, 06:12 PM
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Here is a more detailed description. Tstat send heat signal. Measured at 24v. First fan kicks on. Pilot glows orang. Main burner ignites. Runs fine for 3-5 mins and moves house temp up 1 degree. Then two clicks. Main burner shuts off. Blower continues to run. No registered voltage to anything. Almost like shut down except for blower. No error codes. Pilot immediately turns orange again. Burners re-light all fine for 3-5 mins then the process starts all over again.

I had originally thought the clicking was during the lit burner. That was in error.

Control module?

Trane XE 80

Thanks for any ideas you may have.
 
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Old 12-14-12, 02:13 PM
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You need to determine what is shutting off the burners.


Measure the AC voltage from the R terminal to the C terminal. That should be 24 VAC whenever the power to the furnace is one and the blow door switch closed.

Next measure the voltage at the W terminal. That should be 24 VAC whenever the thermostat is calling for heat.

Next measure the voltage at the pressure switch. One terminal should be 24 VAC whenever the thermostat is calling for heat, the other connection should be 24 VAC after the inducer motor fan comes up to speed.

Check to see where that voltage is being interrupted when the furnace shuts off, if it is.
 
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Old 12-15-12, 07:11 AM
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You do not have a pilot. You do not have spark ignition. You have hot surface ignition. It is important to note this when describing your problem as it will lead some, who do not know that furnace specifically, down the wrong path of diagnosis .
 
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Old 01-01-13, 10:54 AM
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Burners shutting off..

Just found out because I had a problem. If you are experiencing the burners shutting off before reaching temp and there is no error code for open limit switch, there is an air flow problem. (Dirty filter or too thick of a filter, too many pleats). The XE80 will shut off during a heat cycle and restart without showing any error code. The internal high limit opens up and cool down and then restarts. After this continues or for some time it will eventually trip the High Limit.
If this continues on you will burn out your igniter (too many cycles) and your high limit. This is exactly what has been happening to me and I celebrated the new year by getting a new igniter this morning and asking my Trane guy a lot of questions . FYI,,, get an extra ignitor on line just to have on hand. they can be as low as $20 and are a great comfort to have when it's a holiday and 10 above outside.
 
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