Ignitor wont glow
It might be cracked or broken. I would carefully remove it (don't drop it), and put an ohmmeter across the contacts. You should get a reading of 500 ohms or less, but not 0 (meter leads shorted to each other).
If the reading is higher, either you don't have the meter leads actually touching the terminals, or the part faulty.
But if it's not faulty, then the ignitor's power source is not feeding it electricity. In this case, the heat sensing circuit may be bad, usually caused by a faulty thermostatic device.
There also may be a loose wire connection inside the unit.
You can test all of the above with a voltmeter. Put the leads, one in each terminal on the ignitor socket, and have someone else start the dryer.
It probably won't work with the ignitor removed, but there should be a slight jump on the volt meter if the circuit is working properly.
I usually don't bother with all that. There's far fewer different ignitor elements than there are appliances that use them, so you can almost always find the one you need in stock, in town.
Take the old one along. Some parts distributors will test the one you bring in, because if they didn't, they wouldn't know what's going on.
If the ignitor is good, they usually know which part failed, because parts guys know which parts fail most on any appliance.
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