You can check the thermocouple with a good voltmeter - and you have one, as I recall.
The thermocouple is actually a small thermo-electrical generator. When it is hot, it generates a small fistful of millivolts. My memory is hazy, but I'm thinking on the order of 20-30 mV?? You should look it up, rather than taking my word for it. Anyway, this very small voltage operates the gas valve.
If you see these hot millivolts, then the thermocouple is good. If it generates no millivolts, then it is probably bad.
Bill
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