Gas water heater shuts down

Gas water heater shuts down

by Tony
(Simi Valley CA)

The gas burner operated for 5 minutes then shut down.(The pilot went out) I removed burner and cleaned thermocouple probe. Burner now ran for 13 minutes, but still shut down before hot water temp was reached. By observing the lit pilot thru the small glass window I saw the pilot getting smaller and smaller until it went out.

Gas supply is good at pilot supply on gas valve, and the pilot line and pilot has been blown out using compressed air.

Is it the gas control valve at fault or the thermocouple?

Your comments are appreciated. Many thanks.

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water heaters