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Old 12-29-2009, 10:56 PM   #1
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Trane XE78 No Glow


I am not getting a glow from the ignitor. I have a trane XE78 with a white rodgers 50A50-405 module. No error codes, just normal call for heat. Ignitor appears to be in good shape and clean. after resetting from lock out, I can manually light the furnace. What else can be wrong except the ignitor?

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Old 12-29-2009, 11:33 PM   #2
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Trane XE78 No Glow


The module.

Did you test the ignitor or module.

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Old 12-30-2009, 07:36 AM   #3
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Am I looking for 120V on the ignitor when it is supposed to heat up? How do I test the module?
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Old 12-30-2009, 07:50 AM   #4
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Not sure on yours anymore if its 120 or 24volt.

Use a meter to see if the module is putting out voltage.
Check ohms on ignitor.
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Old 12-30-2009, 01:45 PM   #5
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Trane XE78 No Glow


Quote:
Originally Posted by cdaviswa View Post
I am not getting a glow from the ignitor. I have a trane XE78 with a white rodgers 50A50-405 module. No error codes, just normal call for heat. Ignitor appears to be in good shape and clean. after resetting from lock out, I can manually light the furnace. What else can be wrong except the ignitor?
1. Verify you are getting 120 volts from the ignition module to the plug to the ignitor. If not replace the module.

2. If you are getting 120 volts, ohm out the ignitor...it should be somewhere around 40-80 ohms cold. (don't try to ohm it when it is hot.) Because the ignitor is always in the flame it ages and the ohms will increase. When I did fall clean and checks if the igniter was getting up into the 100 range I would replace it. I have seen them higher but eventually they will fail and it is usually Christmas or New Year's Eve (or when it is -20F) when it happens....The ignitor is a consummable product just like the old thermal couples...it is not that expensive...better to be safe that scrambling at those times.

3. Also make sure you have good contact on all your connections.

4. I don't know what you mean by manually lighting the furnace, but be careful that can be a dangerous thing to do......hate to see you loose any hair or skin should it backfire.
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Old 12-30-2009, 09:32 PM   #6
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Trane XE78 No Glow


Thanks for the safety tip. I didn't think about backfire.
I am getting 81V from the module?? No resistance from the ignitor.
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Old 12-31-2009, 10:40 AM   #7
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81 volts is not enough. You should have 120 volts to that igniter.......the newer silicon nitrite igniters work in the 80 volt range (they are designed to do so), but the older silicon carbide need 120 volts. Sounds like a bad board....

Good Luck
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Old 12-31-2009, 08:48 PM   #8
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How about a laugh at my expense....I thought the flame sensor was the ignitor..................Newbie.
I didnt find out until my wife went to get the replacement part from the local hardware store and the guy told her she had the flame sensor. Sent her a pic of the real ignitor and she brought one back and the furnace fired right up! Thank you for the help!

Maybe next time consider the home owner is an idiot!
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Old 01-01-2010, 10:54 AM   #9
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What hardware store did you get the part at? I think all mom-pop hardware stores near me have closed due to blue and orange stores. I'd love to have a place like that near me.
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Old 01-03-2010, 01:34 AM   #10
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Mcleondon's Hardware; local in Washington state. I think they are what the blue and orange stores try to be like. Best service from knowledgeable people, with an exceptional selection. You pay a little more, but worth it.

Hey, with the help of DIY and my own learning curve, just fixed the neighbors furnace today!

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