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Whirlpool Duet Dryer, WGD9200SQ0 not heating

duet dryer whirlpool

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6 replies to this topic

#1 Bill in Kansas City

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Posted Today, 07:18 PM

The unit runs but does not heat. In diagnostic mode, I get code F28, which points to either the thermistor or the main control board.

 

I have troubleshot the machine to within an inch of my life, and I'm down to the last step, checking the resistance on a couple of wires, "If the resistance reading doesn't match the table replace the thermistor. If it does, replace the machine control electronics." Here's where it gets dicey for me, so I need some clarification from more experienced minds.

 

The chart says:

 

60°   14.8-16.8

70°   11.5-13.5

 

The temperature in the space is lower than 70, but above 65. The resistance on the multimeter is 16.1 So, is that a match or no? Obviously, I hope the issue is the thermistor; that's $20 as opposed to $160.

 

And insights? Thanks!

 

 - Bill in KC



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#2 sh2sh2

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Posted Today, 07:19 PM

What else have u checked

#3 Bill in Kansas City

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Posted Today, 07:37 PM

What else have u checked

 

I followed the troubleshooting guide for code F28, which is actually pretty short. Moisture sensor is the issue, either the thermistor or the main control circuitry.

 

Moisture sensor. In diagnostic mode, produces a tone when shorted. Check.

 

Run for 60 seconds in timed cycle, look for F22 or F23 error code. No code displayed. Check.

 

Examine physical connections. All tight, no corrosion, no worn wires. Check.

 

Test resistance of two wires in the harness, comparing the resistance value against the chart.

 

This leads to my question, above.



#4 sh2sh2

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Posted Today, 07:40 PM

Ignore the code for now, check the basics, does the ignitor glow? Thermal fuse on blower housing have continuity? The reading u gave for the thermistor seems ok

Edited by sh2sh2, Today, 07:41 PM.


#5 Bill in Kansas City

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Posted Today, 09:01 PM

Ignore the code for now, check the basics, does the ignitor glow? Thermal fuse on blower housing have continuity? The reading u gave for the thermistor seems ok

 

No action on the ignitor. No reading on the thermal fuse, so that means continuity, yes?

 

Other things that might be relevant: valve on the gas line is open - no smell of gas, so the dryer's not using it; dryer exhaust is clean, but at this moment disconnected so there's no obstruction in any case.



#6 sh2sh2

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Posted Today, 09:04 PM

No reading ususly means open, continuity would be zero or close to it, sounds like u need a thermal fuse

#7 Bill in Kansas City

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Posted Today, 09:35 PM

I'll admit to being new to using a multimeter. Set on 20k (the same setting I used to test at the wiring harness), leads touching nothing, it reads "1." I unplugged one of the leads on the fuse and touched the leads to either of the fuse contacts, there was no change in the reading.







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