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dietrichnp1  
#1 Posted : Saturday, August 3, 2013 9:13:39 AM(UTC)
dietrichnp1

Rank: Member

Groups: Registered
Joined: 8/3/2013(UTC)
Posts: 2

Model: MDG9700AWW
Serial: 14566145GT

Symptoms:
One day my gas dryer stopped working. No spinning or attempt to spin. No heat or attempt to ignite. The buttons on the front of the unit appear to work correctly and the lights appear to work correctly. When the cycle start nob is pressed the main control board has a relay click, but nothing happens. Through all of my troubleshooting below, the symptoms have stayed the same.

Troubleshooting:
Checked 120 VAC incoming power. Good.
Checked door switch for continuity. Good.
Checked mini belt break switch for continuity. Good.
Replaced main control board
Replaced thermistor
Checked motor pins 3-4 and got 2.2 ohms
Checked motor pins 4-5 and got 2.2 ohms
Replaced motor
Replaced PCB assembly board with lights and buttons

While troubleshooting I only tried one item at a time. In example, I replaced main control board...symptoms didn't change...then put the original main control board back in and then moved to next troubleshooting step. Are there any items I should be trying in tandem?

It is weird (and frustrating) that I get no action on the machine when the cycle is started. Just a typical relay click. It feels as though a control interlock is in place (fuse, sensor, etc.). I am not sure what else to test or try? The only things left are the thermostats, radiant flame sensor, ignitor. Would any of these items make the unit not work at all???

Thanks!
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HumboldtRepairMan  
#2 Posted : Saturday, August 3, 2013 11:57:44 AM(UTC)
HumboldtRepairMan

Rank: Member

Groups: Registered
Joined: 7/16/2013(UTC)
Posts: 916

Check your tech sheet and follow the paths....most units have the heating circuit separate from motion circuit meaning even if the heat out the unit will at least turn but won't have hot air. Also you may have gotten bad parts to begin with. Did you continuity test all parts added? Check to make sure you have a good nuetral and ground on the unit at the plug coming to the back of the unit also check to see if your wall receptacle and plug are in good condition and making good contact on the plug.
dietrichnp1  
#3 Posted : Monday, August 5, 2013 5:17:48 PM(UTC)
dietrichnp1

Rank: Member

Groups: Registered
Joined: 8/3/2013(UTC)
Posts: 2

I checked all the incoming voltages and the wiring for integrity. Good ground, neutral, breaker, receptacle etc.

When the cycle is started, motor pin 2 is reading 70 volts. Is that correct?
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