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Author Topic: Long dry time and low temperature  (Read 26222 times)

Offline JWWebster

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Re: Long dry time and low temperature
« Reply #20 on: March 01, 2010, 03:41:33 PM »

You gotta break it down to clean it out. This is a newer model and I have not worked on one but most of these newer ones have to remove some screws on the back side and slide the top off and then the front can come off from there the dryer is exactly like that of a DOT dryer with the removable filter bladder and heater element to the right hand side on the bottom and the blower wheel to the left on the bottom.
« Last Edit: March 01, 2010, 03:47:23 PM by JWWebster »
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #21 on: March 02, 2010, 08:37:33 PM »
I have it apart right now.  The blower wheel looks ok.  When you spin it the drum turns.  The airflow coming out the exhaust  when it was together seemed pretty good.

Offline JWWebster

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Re: Long dry time and low temperature
« Reply #22 on: March 02, 2010, 08:58:10 PM »
That filter and blower area ok?
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #23 on: March 02, 2010, 09:22:09 PM »
Everything looks fine there.  Nothing broken, cracked.

Offline JWWebster

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Re: Long dry time and low temperature
« Reply #24 on: March 02, 2010, 10:22:31 PM »
Maybe you need to change the coils or check the connections or both.
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #25 on: March 02, 2010, 10:33:33 PM »
I changed the coils 6 months ago.  Worked fine for 6 months.  I just changed the coils tonight and still the same problem.

Offline john63

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Re: Long dry time and low temperature
« Reply #26 on: March 02, 2010, 10:59:15 PM »
A Samsung built dryer.

If the dryer vent from the rear of the dryer to the outside vent hood of the home is absolutely/positively clear & not obstructed--replace this thermostat on the burner housing...


ITEM #20


http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=MDG9700AWW&productCategoryId=0151200&brandId=3048&brandDescription=MAYTAG&modelName=MAYTAG-LAUNDRY&diagramPageId=00003&componentDescription=BLOWER-HEATER-MOTOR&documentId=M0702017&blt=06
« Last Edit: March 02, 2010, 11:01:10 PM by john63 »

Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #27 on: March 02, 2010, 11:05:05 PM »
I even tried running the dryer with the exhaust vent disconnected and just blowing into the room and still taking hours to dry.  The air flow coming out seems pretty strong.

Offline john63

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Re: Long dry time and low temperature
« Reply #28 on: March 02, 2010, 11:07:00 PM »
Other possible causes of erratic gas flame function:

1) Main Board (faulty relay)

2) Failing Centrifugal switch on the motor/burnt contacts (New Motor needed)

3) Failed Flame Sensor (intermittent function/burnt contacts)

4) Failing Thermistor (Ohms too low at room temperature)
« Last Edit: March 02, 2010, 11:46:00 PM by john63 »

Offline john63

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Re: Long dry time and low temperature
« Reply #29 on: March 02, 2010, 11:33:54 PM »
I even tried running the dryer with the exhaust vent disconnected and just blowing into the room and still taking hours to dry.  The air flow coming out seems pretty strong.

This can be a *very* difficult fault to diagnose.
On some Samsung dryers that I've serviced---if the symptom was:

"Poor Heating/Long Time To Dry"

or

"Igniter Glows-but-No Flame"

(The exhaust vent system is checked & okay and the gas valve coils were verified to be good)

Test Thermistor ohms at room temperature (listed as 77F) Located on blower housing.

I check the voltage from the Main Board-to-the-Gas-Valve-Coils (115 volts)

Test the Flame Sensor Switch (ohm & voltage)

Test the motor Centrifugal Switch (ohm & voltage)

In most cases--the relay on the Main Board was either erratic or failed to send voltage to the gas valve coils.

This dryer is a bit technical for the average DIYer. It may be wise to contact an authorized Samsung Service Center in your area for an out-of-warranty repair. A zip code service locator is available on Samsung's website (click "Support" first):

www.samsungusa.com
« Last Edit: March 02, 2010, 11:40:01 PM by john63 »

Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #30 on: March 02, 2010, 11:56:24 PM »
Should each thing be tested when the dryer is running or?  When the flame is on or not?

Offline jumptrout51

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Re: Long dry time and low temperature
« Reply #31 on: March 03, 2010, 07:02:44 AM »
Power to specific components must be tested in the run mode.
Most parts can be verified with the dryer off and unplugged to check continuity of the parts,thermostats,fuses,flame sensor ignitor etc.
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #32 on: March 03, 2010, 08:58:56 PM »
Tested ohms on hi limit and coils and both tested to specs listed in service manual.    1 ohms on the flame sensor.

Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #33 on: March 03, 2010, 10:43:22 PM »
I put it back together and still taking hours to dry.  It sounds like the flame is only staying on about 20 seconds each time it lights up.  I have the exhaust vent disconnected and blowing into the room.  It is getting good airflow.

Offline JWWebster

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Re: Long dry time and low temperature
« Reply #34 on: March 03, 2010, 11:09:42 PM »
Feel the coils after they kick on and off for a few times.
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #35 on: March 04, 2010, 09:03:35 AM »
To see if they are hot or??  THey are brand new ones I just put in the other day. 

Offline JWWebster

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Re: Long dry time and low temperature
« Reply #36 on: March 04, 2010, 09:30:54 AM »
Ok on the right hand side of the blower housing is a Thermistor. I would be bet that thing is shot.
« Last Edit: March 04, 2010, 09:34:24 AM by JWWebster »
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Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #37 on: March 04, 2010, 08:27:03 PM »
I am getting 18,000 ohms on tht thermosister at about 65 degrees room temperature.  Also how do you test the humidity sensor bar?

Offline dirtrider180

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Re: Long dry time and low temperature
« Reply #38 on: March 07, 2010, 08:56:39 AM »
Got a new thermosister.  I took the old one out and left them both in the room to adjust to the same themperature.  The old one was reading 1,735 ohms the new one 1,760.

Offline RegUS_PatOff

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Re: Long dry time and low temperature
« Reply #39 on: March 07, 2010, 09:22:49 AM »

MDG9700AWW Service Bulletin

35001224

click on picture
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