Gas Dryer - heat sometimes


  #1  
Old 09-27-05, 08:56 AM
ghartman
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Question Gas Dryer - heat sometimes

Neighbor has a Whirlpool gas dryer. She says unit blows hot air sometimes and other times is cold air. I went last night to trouble shoot and here is what I found / did:
1. cleaned all lint from unit so airflow is free and at this point removed the outside vent pipe
2. checked fusible link - ok
3. gas will light first time and then shut off once it reaches temp (hot setting only available on this model). this is with the entire dryer together. then the glow plug will become bright and then shutdown.
4. removed drum to get to burner unit. turned on dryer and glow plug lit, gas fired on and then shut off at high temp cutoff, it cooled down and repeatedly did the same thing 3 times. put the unit back together and now the unit only will turn the glow plug on for a short time.
I have not checked gas solenoid coil resistance - could these be faulty?
Could the glow plug thermocouple be faulty?
What should be the next step?
Any insight is greatly appreciated in helping me troubleshoot

Gary
 
  #2  
Old 09-27-05, 07:16 PM
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Hello Gary. Welcome to my Gas Appliances topic and the Do-It-Yourself Web Site.

Check the blower housing fan compartment and the internal vent. May have a restirction. Solenoids may be defective. Gas valve may be defective. Flame sensor, on the burner shroud may be defective. More likely solenoids. Replace them.

Additional help:
http://forum.doityourself.com/showthread.php?t=159481

Whirlpool's Home Web Site:
http://www.whirlpool.com

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Retail appliance parts dealers can also help determine what the most likely possible problem may be. They will need the make, model and serial numbers. Appliance parts dealers are an excellent source for original replacement parts and problem resolving matters. Dealers are listed in the phone book under appliances.

Read the existing questions on the subject of dryers. Doing so will quickly provide you with answers to questions & provide additional information on how to resolve the problem.

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  #3  
Old 09-29-05, 05:25 AM
ghartman
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Post Gas valve solenoids

Thanks for the feedback. I went home and checked out the valve coils resistance, ignitor sensor continuity and voltage to ignitor. All checked out okay. I was reading more on troubleshooting and one statement caught my eye "gas valve coils are very bad for working once or twice and then quitting". This almost seems to point the finger at the coils? Is there a test I can do on the coils to simulate them under load? Do you think that when they are getting hot they could be shorting out and that is the problem?
Also, when I looked through the schematic, it talked about a timer for the gas burner - what exactly does this timer do and is it related to the ignitor and gas valve?

Thanks for any insight.

Gary
 
  #4  
Old 09-29-05, 05:32 PM
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Hi: Gary

I do not suggest testing and or volt/ohm reading and/or checking nor often recommend solenoid testing. For most people and in many cases, in my opinion, it is a waste of time. Also difficult to explain in a text only format. The parts are often the cause, needed, inexpensive and easy to replace.

The solenoids are likely to check out under continuity. They are at room temperature. But once heated slightly with a constant current flow, during normal operation, is when one will fail. One than shorts out and drops out. Thus the burner shuts off. Ignitor likely to cycle on and off but the burner fails to light. Change the solenoids and be done with it.

The timer is the the control timer when the selection cycle settings are made. The timer controls all operations and functions. Related to the timer but does not directly control the events of the individual parts.

Change the solenoids.
 
 

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