When relighting a gas water heater pilot light, you must hold down the pilot control button firmly for a minimum of 60 seconds after the flame ignites. This crucial waiting period allows the flame to heat the thermocouple tip sufficiently, generating enough millivolt electrical current to keep the internal safety magnetic valve open. If you release the button too quickly, the thermocouple will cool down and the valve will snap shut, extinguishing the flame. Verification: Release the button slowly and verify through the sight glass that the pilot flame stays lit.
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