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Gas dryer does not stay lit.


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8 replies to this topic

#1 MNArctic

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Posted 11 September 2005 - 08:59 AM

Dryer lights runs for a few seconds, then flame goes out just after the lighting cycle.

Completely vacuumed cabinet and duct work.  No blockage. 

I jumpered High Limit switch, P/N L220-40F or Maytag P/N 303395, and it runs.

I removed the burner, found some rust in the tube, assumed it re-directed the flame and burned out the switch.  Bought new switch and new burner and installed.  It does the same thing.

If I jumper the high limit switch, it runs.  It doesn't seem like it is overheating.  What am I missing?  Is the new sealed in Maytag bag high limit switch bad?  Is it supposed to be in an Open or Closed state before applying heat?

Attached is a picture of the burning flam.  Looks good to me.

Any help would be greatly appreciated.

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#2 MNArctic

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Posted 11 September 2005 - 09:01 AM

Maytag  Model LDG7400AAW  S/N A33xxxxxxxxx

#3 kdog

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Posted 11 September 2005 - 10:00 AM

possibly an air flow problem- partially blocked vent exhaust or failed blower wheel.
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#4 MNArctic

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Posted 11 September 2005 - 10:17 AM

All troubleshooting had been done with the front cover off so I assumed that any venting issues were null and void.   The fact is that the blower pulls the flame past the high limit switch, so if the front door is not on, it does not pull the flame past the high limit switch causing it to open.  The dryer seems to run fine when not connected to the external vent.

My vent runs 20 feet plus, so I feed 4 inch to a 4-6" adapter, then run 6" heat duct the 20',  then convert back down to 4 inch to exit the house.  I did this thinking of less turbulence/drag when trying to vent that long.  Any venting comments?

Thank you very much.

 


#5 Pegi

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Posted 11 September 2005 - 10:25 AM

If the dryer runs fine with your vent disconncted, then keeps going out when it is connected, there can be nothing else but you vent system in the home, gas dryers will not stay lit with any restrictionn of the air flow frim the dryer.
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#6 Samurai Appliance Repair Man

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Posted 11 September 2005 - 10:25 AM

Repeat the test with the vent hose completely disconnected from the dryer. No cheating! If you get the same results, replace the valve coils:

http://www.repaircli...sp?R=154&N=3473

#7 MNArctic

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Posted 11 September 2005 - 11:03 AM

On my 3rd post, I was saying thanks because it seems that the venting was the issue and solved the problem.  I also was saying that having the door on is a must in the troubleshooting becuase it pulls the flame past the high limiter switch.

Any venting comments on the length of run or the configuration of the venting?

 

Thanks again.


#8 MNArctic

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Posted 11 September 2005 - 11:59 AM

Well.... maybe not.

Found the end of vent run plugged.  Cleared vent, blows much, much better.  With the unit completely back together, if I run it empty on regular load here is what happens.

Ignighter glows, 15 seconds later gas, it lights, then runs for 45 seconds, then off.

I guess I shouldn't have celebrated just yet.

 


#9 Pegi

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Posted 11 September 2005 - 03:27 PM

Try it with a wet load before wondering if something is wrong....then let us know how it does.
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