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msu200flyer@yahoo.com

new member

0 post(s)
posted on 4/2/2007
Please help! I have a Trane XL80 home furnace. Over the past year it has struggled more and more to maintain ignition.

Here is a breakdown of what is happening. The ignition coil lights up with no problems. The gas starts and ignites, but that is where the problems start. Most of the time the gas flow is quickly cut off and the ignition process starts over again. After three times, the furnace locks out and blows cold until I reset the unit. Sometimes (more and more inrequently) the ignition is maintained and the furnace seems to work fine.

I have had several service people look at it, but they all seem to be idiots. Not one has been able to fix it (and I'm out a few hundred dollars). I'm afraid to call another service person because I worry about losing another $100 without getting a solution.

When the unit locks out the light on the board flashes twice which is supposed to indicate "system lockout (no flame) / check polarity".

Any suggestions would be GREATLY appreciated. Thanks so much.

MP

 
 
Replies [ post reply ]
tammyngabe1@att.net

senior member

45 post(s)
replied on 4/2/2007

have they checked your flame senser. if this doesnt feel a flame it will shut everything off , there are other things to check let me know if this helps.i can tell you how to check it if you know how to use an electrical meter.


ljsteffes@comcast.net

senior member

26 post(s)
replied on 4/3/2007

The problem is a failure of the unit to sense or recognize flame. The flame sensor should be located at the left end burner. It is a metal rod with a ceramic insulator and a wire connection. It can be cleaned with fine steel wool, but never clean it with sand paper. It may need to be relplaced. Other possibilities are: incorrect polarity (probably not the case unless you recently had electrical work done), poor chasis ground, a defective furnace control, dirty burners, or inadequate gas pressure. Any qualified tech should be able to determine and correct the problem. Shame on the previous so called techs that have wasted your time and taken your money. You should demand a refund or that they fix the original problem.  Good luck...........Gasman

 



hvac40@aol.com

new member

2 post(s)
replied on 4/17/2007

I HAVE ALSO HAD GOOD LUCK USING SCOTCH BRITE TO CLEAN FLAME SENSORS ANOTHER NOTE I BURN PROPANE ON MY FURNACE AND AFTER 12 YEARS NEVER CLEANED OR CHANGED FLAME SENSOR . HOWEVER MY BROTHER IN LAW LIVES IN THE BRONX NY AND SEEMS TO HAVE TO CLEAN IT EVERY YEAR .


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