If the pilot won't light, the first thing to try is to replace the thermopile, assuming you have a good flame on the top portion of the thermopile in the first place when you hold the gas valve in when in the pilot position. If this does not solve the problem, which in 90% of the cases it will, the gas valve is defective. I usually replace the thermopile when replacing the gas valve and save the old one for a backup.
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