Dryer won't stay hot
I have a Sears Kenmore 80 Series Gas Dryer (Model 110.72822101) that dries only when it feels like it. Since it's over 25 years old, it doesn't owe me a thing. However, I think it's probably something simple to fix. I watched through the hole in the front, and this is what happens: 10 secs after I push Start, the igniter glows for about 10 secs and then the flame catches. It burns for about 7-8 mins and goes out. I continued to watch for about 5 mins, and every 45 secs the igniter would glow but the flame wouldn't catch. I've left it running for about 15 mins and checked it every few minutes... same thing. It doesn't matter if I have it set on Auto Moisture Sensing or Timed Drying. I Googled the "symptoms" and several videos came up. Apparently, my problem may be 1) No gas reaching the dryer (clearly this isn't it since it ignited for 7-8 mins); 2) gas valve assembly; 3) gas valve coil; 4) clogged orifice. When I let the dryer cool and then try again, the flame usually catches. Any ideas?
As you have described this problem it is most likely the igniter (the thing that glows). That is what provides the resistance to provide the current for the coils to open in your gas valve. When they break down they will still glow but the heat lowers their resistance and therefore the current they provide the coils. If it is bad a visual inspection will show that a great deal of it is dull. It should have "sparkles" throughout the entirety of it. If it is not dull your problem is in the 2 coils for the gas valve. Many places will try to sell you the entire valve. Don't buy that. You only need the coils/solenoids
TOP 3 Likely Causes
1) Bad igniter
2) Weak gas valve coils
Without a doubt it is #3, the gas valve coils. Replace those and you will be up and rinning. You will need a phillips and a 5/16" screwdriver. If your phillips is so long where you must remove the drum, please note how the belt is hooked around the pulley and practice taking it off and putting it back on before removing the drum.