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When you light the pilot and while holding the valve in against the spring note the size and shape of the flame. Hold the valve in for a minute to be sure that there has been an attempt to heat the thermocouple. When you release the valve again note the size of the flame. If the flame gets smaller when you release the valve and the flame goes out in a minute or 2 I would suspect the flame is not keeping the thermocouple hot enough to satisfy the gas valve. A reduction in flame size may indicate a blockage in the main gas valve.
If the flame goes out the instant you release the valve after more than 45 seconds of pilot flame while holding the valve in against the spring than I would consider the thermocouple.
The thermocouple should heat up in about 30 seconds to a point that it feeds a low voltage to the main gas valve allowing the pilot to stay light.
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