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Two items come into play here - 1) the hot surface cutout and 2) the flame detect Cd cell. Check alignment of the Cd cell or just replace it. The hot surface cutout has two terminals that plug into the two tabs on the millivolt generator.
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wile red button is pushed no flame or turns off when the button is released the flame dies ? if no flame tank is too small or spark isn't in far enough to catch gas . if flame is present with button down then the over heat switch on the in line thermal coupler could b bad u can check the over heat switch with a jumper between the two wires and if it stays lit you got it if it goes out then its the thermal coupler that's bad
is the sensor for the thermocouple located in the right spot in the flame,remove it and if you have access to a propane torch,heat the end till its red hot and leave it connected to the gas valve,then start the unit and this will tell you if the sensor is properly positioned in the pilot flame on the unit itself,if not you could have a defective new thermocouple or another safety device keeping it from staying lit or the gas valve is faulty
Make sure your thermocouple tip is in the pilot flame and the other end is snuggly screwed into the control. Clean the pilot if not heating thermocouple. If pilot is heating tip thermocouple and it still goes out after holding the button down for 2 minutes, then your thermocouple is likely bad.