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Hi, the 3601 uses a thermocouple that is attatched to the gas valve, this detects weather the flame is lit or not, it will allow the flame to burn for 90 seconds, and then if it does not detect the presence of the flame it shuts off. so your issue is either the thermocouple or the gas valve................first thing to do is unscrew the thermocouple from the gas valve, and clean the end then reconnect, and see if it stays on...let me know.........Michael
yes, and much to my dismay this gas valve has been unavailable for many years. You might be able to locate a used one. I researched it found one on ebay, but was sold 4 years ago...............
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