Trane xr80 blows cold air

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  #1  
Old 01-16-18, 04:32 PM
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Exclamation Trane xr80 blows cold air

I have a trane xr80 gas heater that continues to blow cold air. Model number...TUD080C936K4.
I have replaced the filter and even tried it without the filter, i also cleaned the return vents aswell. It seems like it only works for about 1-4 hrs at a time and then it blows cold air. The code flashes 2 times. The ignitor glows red hot and the flames light up for about a second and shuts down and tries again.

I had the same problem exactly 5 years ago and i replaced the ignitor and it worked great up until a month and a half ago. So i did the same thing and replaced the ignitor again but it continues to not work right. Could it be possible i received a faulty ignitor. I looked into gas valve maybe being the issue but i do recieve a flame so does it rule that out? Please help
 
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Old 01-16-18, 05:31 PM
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Welcome to the forums.

Since you are getting several seconds of ignition before failure.... that sounds like a dirty flame sensor rod. It's held in by one screw and the rod sits in the flame. Remove the rod and clean it with steel wool or my favorite is one of those green Scotchbrite pads. You want to polish it so that it's shiny.

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Old 01-16-18, 05:47 PM
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That is the exact part I replaced with a brand new part. Can a brand new one be faulty?
 
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Old 01-16-18, 09:11 PM
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The igniter is the part that glows to light the gas.

They don't go bad unless physically broken. They can just be cleaned again and again. It's just a stainless steel rod.

If that is in good shape.... you need to make sure when the burner lights..... it's in the flame. There are several burner tubes in a row. One tube is ignited and the flame travels from that tube to the next until it gets to the last one and the flame rod.
 
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Old 01-18-18, 12:05 AM
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I stand corrected, sorry. For some reason I thought the ignitor was same as flame sensor. So i found it and took it out and cleaned it like u said and so far so good. Hopefully it runs through the night and its all back to normal. Will update tomorrow. Last question. Should i just replace the flame sensor eventually or it doesnt matter as long as i keep this one clean?
 
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Old 01-18-18, 12:10 AM
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Thank you for your advise, some pictures
 
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Old 01-18-18, 05:04 PM
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Yup.... doesn't look real clean. Polish it up and it will be as good as new.

The coating that gets baked on there is by-products in the gas.
The coating gets very hard.
 
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