Staff Answer
Sep 27, 2026 - 11:48 AM
If it goes out the moment you let go even after holding it that long, the thermocouple isn't holding the safety valve open. Either the thermocouple is worn out, its tip isn't in the flame, or its connection is loose. Check that the tip sits in the flame and that the connection is tight. If that doesn't do it, replace the thermocouple. The N305/N306's 635690 gas valve assembly is discontinued.
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