Kenmore Dryer taking two cycles to dry clothes


  #1  
Old 11-18-05, 07:31 PM
Johnfred
Visiting Guest
Posts: n/a
Kenmore Dryer taking two cycles to dry clothes

Have a Kenmore Model 110 72832 100 Gas dryer. About 6 yrs old. At start up drum turns. A small sound like a valve opening occurs and then the gas ignites. Dryer runs for about 6-7 minutes. Then gas flame goes out. The drum continues to turn w/o heat. After 5-7 minutes the valve opening sound re-occurs and the gas re-ignites. This keeps up causing a normal load to take about an hour and forty-five minutes + to dry. Customarily the drying time was 45-55 minutes. I've cleaned the lint filter and replaced the venting tube from the back of the machine.
I've reasoned the moisture sensor is shutting the flame down prematurely, or the thermal fuse may be hyper-sensitive. Any easy way to tell what me be going on?

Regards and thanks!
Johnfred
 
  #2  
Old 11-19-05, 06:32 AM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 9,927
Upvotes: 0
Received 7 Upvotes on 6 Posts
Hello Johnfred. Welcome to my Gas Appliances topic and the Do-It-Yourself Web Site.

May not be any of the suspected parts you mentioned or it could be. Best advice and method to determine what the actual cause is, is to disconnect the venting system and test dry a load of clothing.

Based on the fact that the dryer is heating but the dryers burner shuts down too soon, chances are the venting system is restricted. Very common problem when the condition you're describing happens. The test is to remove the entire vent from the dryer and dry a normal load of clothes.

If the same problem does not occur, the venting system is restricted. Cleaning and clearing the venting system is required. Do not forget to check the vent hoods flapper door. Flapper must be freely able to move.

If the same problem happens, the problem is elsewhere within the dryer. Best bet before attempting to replace parts, is to do the testing suggested above. It is the most common problem and least costly to resolve the problem.

If that does not resolve the problem, read the existing questions on the subject of dryers that do not provide heat or provide much heat. Doing so will quickly provide you with additional information on how to resolve the problem.

It's also possible one or both of the solenoids could be defective and or the gas valve could be defective. There are two solenoids...both are on top of the gas valve. All terminals on both solenoids must have continuity. If not, you'll need to remove them from the top of the gas valve by removing the entire gas valve assembly first.

Remove both solenoids off the gas valve body by removing the hold down cover plate and replace them both if defective. They are sold only in pairs. Or take the entire gas valve unit to your local appliance parts store and have the entire assembly and all the parts tested individually and as an assembly.

Defective Gas Valve could be the problem. Remove entire unit as an assembly. Take the entire assembly to your local appliance parts store for testing.

CAUTION: Do Not attempt to repair the gas valve! This is a non repairable item. Replacement is the only option, if found to be defective.

Flame Sensor could be the problem. This part is located on the burner housing. If it's defective, it will cause the glow ignitor to not function or cause the problem your describing. Premature shut down. You can test the sensor with a continuity tester or an ohm meter. Should Be fully continuity.

Below is almost all the likely causes for the problem causes, possible solutions & help links.

Defective Solenoids:
There are two...both are on top of the gas valve. Solenoids also supply voltage to the glow coil and are part of the electrical loop.

You'll need to remove them from the top of the gas valve by removing the entire gas valve assembly first. Take them off the gas valve body by removing the hold down cover plate or take the entire gas valve unit to your local appliance parts store and have the entire assembly and parts tested.

Timer:
Control center for all functions. The timer has internal contacts and as it advances through the cycles, one of those contacts can become burned out, stuck opened or closed for any one of several reasons.

Timers also have cams that open and close those contact points. If the timer or any other selection switch, on the front control panel, is suspected of causing the existing problem you're having with the appliance, be sure all selections are correctly set.

If they are, the timer or other function selected switch may be defective. Timers are a non repairable item. Any or all of the control panels switches can be removed and taken to the local appliance retail parts store for testing.

Timers and switches can also be checked for continuity using an ohm meter or continuity tester. However, do not rely soley on a continuity test for proper timer functioning. Timers and switches are a non repairable items.

Fuseable Link:
Check for continuity across this part. It will be located in the exhausts venting system prior to the discharge outlet. If there is no continuity, replace the part. Not all dryers have this part.

Retail appliance parts dealers can also help determine what the most likely possible problem may be. Take with you the make, model and serial numbers.

Appliance parts dealers are an excellent source for original replacement parts. Dealers are listed in the phone book.

Dryer Help Information Sticky Note:
Dryer help info: http://forum.doityourself.com/showthread.php?t=159481

Additional Suggestions:
Read the manufacturers online web site for product information, problem possibilities, causes and solving methods, part locations, disassembly, reassembly methods, repair procedures, instructions, pictorials, schematics, which may be available online.

Sears Appliance Parts & Repair:
Sears Home Page:
http://www.sears.com

Sears Search By Model Number Page:
http://www3.sears.com

Whirlpool's Home Web Site: (Also makes appliances for Sears)
http://www.whirlpool.com

Advertisers & Sponsors Web Sites:
Appliance Parts, Pictures & Help:
http://www.PartSelect.com

Appliances Parts & Help:
http://www.pcappliancerepair.com

Appliances Parts:
http://www.RepairClinic.com

Kitchen Appliance Parts:
http://www.parts-depot.online.com

Whirlpool Appliance Parts: (with pictures & diagrams)
http://www.AppliancePartsPro.com

Retail appliance parts dealers can also help determine what the most likely possible problem may be. Take with you the make, model and serial numbers.

Appliance parts dealers are an excellent source for original replacement parts. Dealers are listed in the phone book under appliances. Be sure the electrical power to the appliance is turned off, before attempting any repairs.

If you need further assistance, use the REPLY button to add any additional information or ask additional questions. Doing so will automatically keep your question at the top of the forum list.

Regards & Good Luck.
TCB4U2B2B Company Enterprises.
Doityourself Web Site Host & Gas Appliances Forum Moderator. Energy Conservation Consultant & Natural Gas Appliance Diagnostics Technician.

DRYER SERVICE TIP:
It's always adviseable to clean the entire exhaust venting system every 2 years. Or during any dryer maintenance, connection and or repairs.
 
  #3  
Old 11-21-05, 06:07 AM
Johnfred
Visiting Guest
Posts: n/a
Kenmore Gas Dryer taking too long to dry clothes.

Pulled the dryer apart and cleaned out the blower channel, it was not clogged. There was "cholesteral style" lint adhereing to the blower channel walls, but air flow was not meaningfully restricted.
N.B. Since vent and air flow hose have been cleaned the dryer now dries clothing. Prior to the replacement of the flow hose, clothes were not drying. Drying time period is still extended.(Two normal cycles to dry a normal cotton load.)
Disassembeled the dryer and ran the apparatus. The motor turns. There is a slight sound sort of like a wheel turning. It may be the gas valve opening. The solenoid clicks, the igniter glows, the gas ignites. The flame is blue with just an occaisional slight hint of orange at the tip of the flame. Little or no "impurities". All seems to be working properly.
The gas flow turns off after about 20-25 seconds. The dryer motor continues to run without gas or flame for about 4-5 minutes, then the cycle begins again. There appears to be a thermostat mid-way up on the metal cowling that channels the heat from the flame chamber into the drum. The thermostat is positioned over a hole/vent on the cowling. Presumably the thermostat closes the gas valve when the metal cowling becomes too hot or the temperature reading at the mouth of the vent beomes too hot. There is continuity accross the terminals on the thermostat.
Three questions:
What apparatus governs the length of the "flame time"?
Is there a recommended length of time for the flame to be burning?
Any suggestions on what else I should look at?
 
  #4  
Old 11-21-05, 05:08 PM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 9,927
Upvotes: 0
Received 7 Upvotes on 6 Posts
Hello: Johnfred

The two possible causes are stated above, in my first reply.

Solenoids or Flame Sensor.

I suggest replacing the solenoids first. Most likely will resolve the problem.

Two questions asked do not apply to the problem cause. The flame size is determined mostly by the BTU output of the gas control valve. Not the problem cause and Non fixable. Thermostat, for the most part, controls temperature. Not likely the problem cause.
 
  #5  
Old 12-27-05, 06:01 AM
Johnfred
Visiting Guest
Posts: n/a
Kenmore Gas Dryer taking too long to dry clothes.

Final results on the Kenmore Dryer. After getting continuity on all components. I gave up & had a repairman come by. He tested the components under load. The master solenoid was faulty. The secondary solenoid was not able to open the gas valve after approximately 15-20 minutes of run time.
Both solenoids tested positive for continuity when they were out of the machine and when the machine was at rest.
Earlier I had replaced the venting tube and cleaned out the exhaust channel of the machine. It improved the operation of the machine from not being able to dry at all to being able to operate conventionally for approximately 12-20 minutes. The machine would take two cycles to dry a load of clothes.
Apparently when the machine cooled down the solenoids would operate again until the solenoid became too hot (?) and would/could not open the gas valve.
I'm confused since I was not aware temperature could impact solenoids??
 
  #6  
Old 12-27-05, 06:28 AM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 9,927
Upvotes: 0
Received 7 Upvotes on 6 Posts
Hello: Johnfred

As mentioned, the solenoids could be the cause. Solenoids are coils of wire. When energized with current they become magnets. As a result of using current, they become warmer or hot. Which is normal operation.

However, heat expands anything it comes into contact with or any part that uses current to operate. Which can cause the parts to become wornout or defective, etc.

Testing provides some means to determine if the part is working properly but not always. Thus I do not often recommend testing as the final determination, unless a part is expensive.

Solenoids are not expensive nor difficult to install. Can be replaced without even removing the entire gas control when an experienced person is doing the job. A diy person can also do likewise with proper instructions, which I try to provide best as I can and possible in a text only format such as this.

The symptoms described can also be caused by a restricted venting system. Which is one of the first systems to test before part replacing. Which I also suggest and suggested prior to assuming a part is defective and or in need of replacing, etc.

Glad the machine is now working correctly and that you took the time to posted back a reply and the final results. Helps everyone else reading this post and your question to learn more. Thanks....
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: