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Kenmore Laundry Center 417.71732810 - dryer EF1


Premium Member
Sep 11, 2021
Model Number
Sears Kenmore
1-5 years
I have an Sears 417.71732810 laundry center that I believe was manufactured in 2018 (serial number = 4E825*****), which appears to be the same as a Frigidaire FFLG3900UW5. This machine was converted to LPG (propane) with kit PCK3100. The dryer will fail (error code EF1) after 22 seconds on any heating cycle, same with diagnostic test #3 which tests the motor, heater, and thermistor. It will not fail on Air Dry or diagnostic test #2, which just tests the motor.
Error Code EF1 = Ventilation blocked error: indicates Air flow duct clogged or blocked. Remove debris, clean and check one way vent operation. Lint filter and duct appears clean, and I removed the vent duct and I get robust air flow on all cycles/tests, but still the heating cycles fail as well as diagnostic test #3.

I'm fairly certain the root cause is somehow related to the heater or thermistor (134587700), but not sure where to start. Probably not related, but possible if the main board is going bad: the washer gives error code EC6 and sometimes fails to unlock the lid. I have a workaround for that issue, so not too concerned about it otherwise.

Was the dryer doing this BEFORE you converted it to LP? Is the flame BLUE with yellow tips?

jenn air flame style.jpg

That thermistor should be 50,000 ohms at room temperature(77 degrees).

Here's the thermistor for your model:
Thermistor 134587700

This appliance came with the home, so I don't know it's history other than what I can see. I suspect it was converted brand new and installed. This particular problem just started a few days ago. I haven't viewed the flame, and it's not immediatly apparent to me how to do so.
If there is no flame port hole in the front, on some models you can watch the flame from the back or the top.


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