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My GE prodigy dryer has stopped heating. I have pulled it apart and checked heating elements and thermostats for continuity

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  #1 (permalink)  
Old 07-04-2017, 09:41 AM
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Post GE Prodigy dryer not heatijg
Model Number: DPSR483EA1WW   Brand: GE   Age: 1 - 5 years   

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My GE prodigy dryer has stopped heating. I have pulled it apart and checked heating elements and thermostats for continuity and everything is checking out ok I believe.

The heating elements are reading 20.0 ohms wiring diagram calls for 19.2 ohms

There were 3 thermostats on the drum. 2 - 2wire and 1 4wire. The 2 wire ones had continuity between the terminals, the 4 wire one had continuity between the outside terminals with all wires removed. The wiring diagram calls these safety left, control inlet, and thermo hi-limit.

I also checked 1 thermostat (4wire) on the exhaust by the fan on the motor, removed all wires and tested the outside terminals for continuity. Checks ok. The wiring diagram calls this one drum outlet.

I vacuumed out all of the lint in the bottom of the tray (there wasn't much) and on the motor then blew the motor out with compressed air and vacuumed up the mess.

Tested the dryer and still no heat. What else do I need to check? I have heard there is a switch on the motor that activates the elements when the motor is up to speed, how do I test this?

I guess the last thing to do would be to test the timers, how should I go about this?

Thanks


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  #2 (permalink)  
Old 07-06-2017, 10:47 PM
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There should be a wiring diagram inside, it'll tell you which contacts in the timer should be closed when the timer is asking for heat. These will be closed whether or not the machine has power as long as it is in a position where heat is required (timed dry for instance) so look at the diagram and see if they are closed. They'll have a letter designation to ID them one the timer.

But first verify that the machine is getting 240v at the terminal block and that the hidden fuse (if there is one present at the terminal lock is not open) Flip your breaker several times if you are not seeing 240 at the wall / or terminal block. It sounds basic but it's gotten all of us a few times in our work.
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Old 07-09-2017, 02:16 PM
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I was doing my testing yesterday and the dryer heated in the medium heat setting. So today I do a load of laundry and again no heat.

I do have 240 on the meter, the timer/switch test as the diagram indicates. I tested both the Timer and heat selector switch.

I decided to go through and retest all of the thermostats and coils.

Safety Left - 0.4 ohms

Control Inlet - Outside terminals / 0.4 ohms
Inside terminals / 8.97k ohms

Hi-Limit Right - 0.4 ohms

Drum Outlet - Outside terminals / 0.4 ohms
Inside terminals / 8.91k ohms

Heater Coils - Inner / 19.8 ohms
Outer / 19.9 ohms

I have also attached a photo of the wiring diagram incase it helps any.
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File Type: jpg dryer diagram.jpg (74.3 KB, 3 views)
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Old 07-09-2017, 10:19 PM
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Since you have heating at times we can rule out all safeties/thermos and the elements. None of them would be likely to have an intermittent issue other than a loose or burnt connector.

So that leaves the timer as the most likely issue. I'd definitely like to examine the prongs of the plug for evidence of arcing, same with the cord connections at the terminal block, either of which could cause intermittent issues. If no burns or pitting on those parts I'd say its internal to the timer. I may be wrong as diagnosis online is not easy on odd issues but you've got to start somewhere.
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