On Monday, August 1, 2016 at 2:06:50 PM UTC-4, Tatsuki Takahashi wrote:
On Mon, 1 Aug 2016 08:55:26 -0700 (PDT), trader_4 wrote:

The thermocouple could be going bad and is marginal. It's function is
to generate enough electricity from the heat of the pilot flame to
keep the gas valve open. Or the pilot cam sometimes get blown out if
there is some unusual high wind event that effects it. I assume that when
lit, the pilot flame looks normal? If not, if it's too small, uneven,
etc then there could be some debris in the orifice.

I don't know what "normal" looks like, but what you said about a bad
thermocouple is understandable.

Do you know if it's easy to replace?

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On the typical older ones it's easy. Newer ones from the last 5 year
or so, IDK, because those have some kind of flame arrestor now and IDK
how much that might complicate getting at it. The thermocouple fastens
to the burner assembly and has what looks like a small tube that runs
to the gas valve. To replace it, you pull the whole burner assembly
out, vacuum up any rust/debris inside, clean up the burner if needed,
put the new one on and put it back together. 30 min job. I'm sure
there are videos.