I am not a professional, just documenting how i repaired the hot water heater's pilot light to stay on.
The solution was adjusting the thermocouple. You can review different thermocouples on Amazon here: [ Ссылка ]

The following link goes to Amazon's Digital Multi Meter with Capacitance:
[ Ссылка ]

Colin G comment:
1. The thermo couple tip should 3/8" ABOVE the "pencil Pilot Tip", should read about 30mv.
2. Once opened the burner door. Manufacture requires installing a new gasket around the burner door to prevent CO and air leakag.

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