Coils on the gas valve, bad ignitor, thermal fuse ( if used on your
model ) would be most common.
Appliance Repair Aid
The ignitor is the easiest culprit to check. Just put the dryer into a
heating cycle and check for 120 at the quick-disconnect. If you have
120 drop, but the ignitor isn't glowing, replace it.
All the fuses and stats can be checked as well. Here's the cheater
way: pull the wires off and connect them to eachother, bypassing each
part. You can only do this temporarily though. Don't operate a dryer
with a bypassed star or fuse.
Thanks much to all who responded.
I was able to walk a friend through it, and in this case it turned out
to be the thermal fuse.
He's going to do a thorough check of his vent to make sure it's clear
of kinks and lint build-up.
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