Question about GE Profile DPSB620ECWW Electric Dryer

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PROBLEM: Dryer doesn't always heat. - GE Profile DPSB620ECWW Electric Dryer

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  • tinkerhead Sep 10, 2010

    Product: GE DPSB620EC4WW Dryer

    PROBLEM: Dryer doesn't always heat.
    Tests conducted:
    :: Verified 240VAC at outlet.
    :: Heating element works sometimes, and tests fine (no dead short, no open circuit)
    :: Thermal fuse is closed.
    :: Tested thermistors. Inlet measures in the neighborhood of 47kohms (per the schematic inside the back panel), outlet thermistor measures about half of that (which it doesn't say it should on the schematic).
    :: Both thermostats closed at room temperature.

    Parts replaced:
    :: Main circuit board (it was under warranty and everything else seems to check out okay, except output thermistor?)

    My initial problem was cold wet clothes at the end of a cycle. Sometimes you could cycle the power and it would work. Other times you get nothing. I disassembled the entire dryer, checked all electrical components, results above. The only thing I found to be odd was the output thermistor reading. The spec sheet inside the back panel only says that the thermistors should read about 47kohms at 85 degrees or so, doesn't specify there should be a difference between the input and output, however a local applicance tech says that seems fine? After I put in the new mainboard, I turned the dryer on a timed dry (no sensor) high heat – worked fine. We have run 2 loads of clothes through since and it seems when you use the sensor on medium heat, it didn't work. I managed to get that load dry by using high heat for 30 minutes on timed (no sensor) dry.

    I'm out of ideas here. The output thermistor is the only thing I think could possibly be the problem? Does anyone know the correct value for the output thermistor on this dryer at a certain temp (e.g. 85 degrees F)?

  • tinkerhead Sep 10, 2010

    Sorry for the jumbled mess. It was nice and formatted, but looks like it removes all the line breaks... Bottom line is everything seems to be fine, I replaced the main controller board but it doesn't seem to have helped. I suspect the outlet control thermistor, but I am unsure what the resistance should read at room temperature.

  • tinkerhead Sep 10, 2010

    My apologies, meant to say that the inlet thermistor registered in the neighborhood of 78kohms, the outlet was in the 40s. If the values listed on the troubleshooting guide are for both, it would seem the dryer thinks the outlet temperature is very high and may be shutting off the heater coils.

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If you are having problems with your gas dryer not heating the most common problem is that the ignitor goes bad. Even though it glows sometimes it is still not working properly.

if you dryer is gas check out this gas no heat tip....

If you have an electric dryer, you can have many different things that can go wrong causing the dryer not to heat.

check out this electric no heat tip...


heatman101

Posted on Sep 12, 2010

  • tinkerhead Sep 16, 2010

    This troubleshooting tip doesn't mention thermistors. That was the problem. Outlet thermistor was reading in the 40s kohms. Should have been in the 70s kohms for the temp I was in. I ordered a replacement, swapped it out and I'm drying again. The dryer thought the heat was really high coming out the outlet so it was killing the heat.

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·                                 I like this quote from fixitnow.com
by Samurai Appliance Repair Man
 
dryer runs but doesn’t heat, don’t even think it’s the thermal fuse. If the thermal fuse was the problem, the dryer wouldn’t run at all. 
First thing to do is verify your source voltage for the dryer; for those of you in Manhattan, this means to use your multi-meter to measure the voltage at the dryer outlet to make sure you have 240v. Y’see, Slick, the dryer motor only needs 120v supplied by one of the lines to run. But the heating elements, on the other hand, need 240v supplied by both lines to get hot. 
If the source voltage is ok, then the most likely bad parts are listed below. As always, you should use your meter and the tech sheet supplied with your dryer (and cleverly hidden inside the control panel) to verify: 
1. Even Heat Board 
2. Heater Relay 
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dryer runs but doesn’t heat, don’t even think it’s the thermal fuse. If the thermal fuse was the problem, the dryer wouldn’t run at all. 
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