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Maytag Gas Dryer MDG9700aww

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Posted: Tue Oct 26th, 2010 07:23 pm

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dans1232
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The dryer LED's turn on and the selector knob works fine. When I select a cycle and press start, the motor does not start. The LEDs on the front operate like the cycle has started. The drum and belt are intact. The motor spins freely and is not locked up (nor does it hum like its burnt up). I got codes 10 and 11 from the dryer.

When I press start, I can hear the relays opening and closing. I checked the voltages and ohms on the control board and all seem to be within their specs.

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Posted: Tue Oct 26th, 2010 08:20 pm

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RegUS_PatOff
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check the Safety Thermostat # 22 on the Blower Motor Housing

click on picture

and check & clean your Vent System

Dryer Vent

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,

click on picture $ 4.99 sometimes on sale for $ 2.99

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Posted: Tue Oct 26th, 2010 09:44 pm

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dans1232
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Dryer vent is clean and was recently replaced. I am unsure how to test this thermostat. When the dryer is unplugged or turned on, ohms=1. When the dryer is turned on to begin a cycle, ohms are less than 1.

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Posted: Wed Oct 27th, 2010 01:05 am

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RegUS_PatOff
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resistance OHMs are with power removed

voltage is with power ON

It's either a bad Safety Thermostat, Door Switch, Belt Switch, Motor, or Controller

MDG9700AAW Tech Sheets

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Posted: Wed Oct 27th, 2010 02:31 pm

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Samurai Appliance Repair Man
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Start by ohming out the thermal fuse like Master Reg suggested.

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Posted: Wed Oct 27th, 2010 03:20 pm

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dans1232
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The safety thermostat has been ordered. I'm crossing my fingers and will give you a progress report when it is installed. Thank you for your assistance.

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Posted: Wed Oct 27th, 2010 03:35 pm

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7^th Post

RegUS_PatOff
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dans1232 wrote: ... I am unsure how to test this thermostat. When the dryer is unplugged or turned on, ohms=1.
seems OK, but could depend on how you're testing ..

digital meter ?

200 OHM scale ?..

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Posted: Wed Oct 27th, 2010 05:01 pm

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dans1232
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I am using a digital multimeter. I get a reading of 1 for 200ohm scale.

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Posted: Wed Oct 27th, 2010 05:02 pm

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dans1232
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To clarify, the meter always reads 1 when there is no conduction between the probes.

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Posted: Wed Oct 27th, 2010 08:55 pm

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RegUS_PatOff
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dans1232 wrote: .. the meter always reads 1 when there is no conduction between the probes.
reads 1 ?

OR a flashing 1.xxx

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Posted: Wed Oct 27th, 2010 09:09 pm

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dans1232
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It does not flash. Just reads one with no conduction.

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Posted: Wed Oct 27th, 2010 11:46 pm

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RegUS_PatOff
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dans1232 wrote: It does not flash. Just reads one with no conduction.
when set to 200 OHMs, and the probes are not touching anything or each other ?

meter model number ?

picture ?

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Posted: Thu Oct 28th, 2010 05:15 am

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13^th Post

dans1232
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when set to 200 OHMs, and the probes are not touching anything or each other ?
Yes

meter model number ?

If both probes touch, the meter reads less than 1 (.010).

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Posted: Thu Oct 28th, 2010 05:22 am

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Tronicsmasta

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yes when all the way to the left, the 1 is actually an I... letter I for infinity

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Posted: Fri Oct 29th, 2010 05:33 pm

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dans1232
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Thanks for the info.

***update**
It was a bad safety thermostat. Once I replaced it, the dryer worked fine. I can't help thinking that this was due to replacing the dryer vent recently with another reinforced foil vent. I have since piped it with a rigid wall pipe. My thanks to all.

The first beer is on me!!

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Posted: Sat Nov 20th, 2010 12:17 am

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dans1232
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Well, its not even a month later and the dryer is having the same issue. This time, it is showing Codes 2 and 10. The dryer is in the basement and the temperature is above 65 degrees. I will take it apart tomorrow and check the thermistor and the safety fuse.

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Posted: Sat Nov 20th, 2010 12:44 am

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dans1232
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The safety thermostat is at infinity and the thermistor is at 11.6k. I have only ran about 10 loads through the dryer since the last fix.

The dryer vent is hard piped outside. It is about a 12 foot run with two 90 degree bends. The dryer is in the furnace room of my basement. The temperature is fairly constant in the upper 60's.

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Posted: Sat Nov 20th, 2010 12:57 am

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kdog
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dans1232 wrote: The dryer is in the furnace room of my basement.

How big is the room, if there is a door on the room, can the dryer get adequate air supply ?

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Posted: Sat Nov 20th, 2010 01:25 am

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RegUS_PatOff
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still sounds like a Vent issue..

What's the temperature at the back of the Dryer (empty load) with the Vent disconnected ?

how's the air-flow where the Vent exits the house ?

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Posted: Mon Nov 22nd, 2010 08:51 pm

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20^th Post

dans1232
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Ok, new safety fuse was installed. The dryer is in an open room with plenty of return air. The vent system is brand new. There are no obstructions and I can see clearly thru it.

I tested the temperature coming out of the back with: the dryer empty, 20 minute timed dry, high heat. I turned it off when the dryer hit 175 degrees and continued to climb (about 4 minutes into it). The earlier post said it should be between 135-160.

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