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Maytag Neptune Dryer overheating (model MDG3000AWW)


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11 replies to this topic

#1 Wacasama

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Posted 21 June 2013 - 09:00 AM

I have a Maytag Neptunre Dryer (model MDG3000AWW) that just started to get really hot.  It appears to me that the temperture control system is not working anymore.  Gas system ignites and just keeps firing regardless of temperature setting.  What are the common things to check.  I have read some articles on the cycling thermostat failing.  If this is the likely cause, where can I find some information on testing this theory?



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#2 Spannerwrench

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Posted 21 June 2013 - 10:20 AM

First off, check the most common, the vent may be clogged.

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#3 RegUS_PatOff

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Posted 21 June 2013 - 10:27 AM

did you buy this Dryer new ?

Has anyone worked on it, and possibly by-passed any of the safety thermal devices ?

 

Dryer Vent 4" diameter

Vent should be rigid metal.
Short lengths of flexible metal may be OK, if not crimped when moving the Dryer into place.
NO plastic
NO PVC
NO screws
Foil Duct Tape is OK.
With an empty load, Timed Dry, High Heat, the vent temperature should cycle somewhere between 135F and 160F
Check / clean the Dryer Vent
Disconnect the Dryer Vent and check for good air-flow there and where it exits the house.
Check the Vent air temperature at the back of the Dryer.

If you have a Harbor Freight Store near you,
$ 3.99 sometimes on sale for $ 2.99
image_1255.jpg


 

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#4 Wacasama

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Posted 21 June 2013 - 12:18 PM

Sorry.  I forgot to mention that we verified very good flow to the outside vent and there are no obstructions. 


Also (hit send too early), we bought the dryer new.  It has worked fine for years up to this time. 



#5 RegUS_PatOff

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Posted 21 June 2013 - 12:35 PM

disconnect the Vent and measure the temperatures with an empty load


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#6 Wacasama

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Posted 21 June 2013 - 01:24 PM

Will do.  I will be working on this later today.  If the temperatures are above the range you noted above, what would you recommend?



#7 RegUS_PatOff

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Posted 21 June 2013 - 01:31 PM

depends what temper it cycles at..

one the T hemostats may be bad


OR set the Dryer to a Air-Fluff (no-heat) cycle to make sure there is no heat.


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#8 Wacasama

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Posted 21 June 2013 - 06:10 PM

OK.  Here is the update.  The dryer continues to fire at all temperature settings.  As a result, the temperature climbed through 160 (and was still going) when I shut it down.  However, in air fluff, the burner did not fire.  Looks like a temperature control loop issue.  Where are the temperature elements located so I can verify if I have an open circuit?



#9 RegUS_PatOff

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Posted 21 June 2013 - 06:26 PM

sorry, I was thinking this was an electric Dryer

 

Cycling Thermostat

http://www.repaircli...sp?R=154&N=2893

 

Cycling-Thermostat-3387134-00693205.jpg

# 8 in diagram

 

X2905878-00013.png


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#10 Wacasama

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Posted 21 June 2013 - 07:26 PM

Ok.  I have it in my hand.  There are 4 terminals  one with white wire, one with Red, two smaller ones with purple wire which is jumpered from one to the other.  What two terminals are we checking continuity between.  If it is the red and white, I do not have an open circuit.   Between the purples, I do. 



#11 RegUS_PatOff

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Posted 21 June 2013 - 07:46 PM

The "large" terminals is the "Thermostat"

The "smaller" terminals is the resistor that is used to "internally heat" (fool) the Thermostat to open earlier

 

The "large" terminals should have continuity at room temperature and "open" at about 155F


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#12 Wacasama

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Posted 21 June 2013 - 08:27 PM

Well that is it then.  The fact that it is open and 'rattles' when you shake it indicates the resistor is shot.  Your help is much appreciated Sensei. 






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