Matag Gas Dryer not heating up

Dear Expert:
My name is Gregg & I am a 20+ year Hydraulic & Mechanical Aircraft Mechanic for a large airline. I can fix most things, however this is one I don’t want to proceed without some who really know how to trouble shoot & find the best solution. Enough about me, here are my questions.

1. We have a 9 year old Maytag gas dryer Model # MDG4000BWW and it has stopped providing heat for drying our clothes.
• We had had a similar experience with previous gas dryer & I am thinking that our current problem might be of the same ilk.
• Here is what I understand at this point.

o Lint trap is clean, damp clothes are placed in the drum, the door is closed, temperature setting is dialed in at high heat, & the start button is engaged, everything begins to work like normal.
o 60 minutes later the clothes are wet & the drum cavity is cold.
o I physically checked to assure that gas was getting to the gas valve unit located at the bottom rear of the unit.
o I understand the gas valve has safety features built in so as to prevent ignition before all the right conditions are met for correct ignition.
o This is where I need help. Do I just replace the whole unit or can more diagnostics be done to correct the problem & if so, at what cost?

Thank you & I look forward to hearing from you very soon.


Gregg L. Mitchell
73 Maple Ave.
Atherton, CA 94027
(650) 380-2113