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Thermocouple keeps the pilot lit. Thermopile keeps the burner lit. Please specify what won't stay lit... If it's the burner, you may need to change the thermopile as well. If the pilot still won't stay lit, you will want to make sure that the pilot flame is large enough to completely engulf the thermocouple and keep it hot. If it's too small, you may need to take some compressed air and blow out the pilot hood to remove any blockage.
Not thermopile. If your pilot will not remain lit, you need a thermo-couple. This is the device that allows the pilot to remain lit. If you can't even get it lit, you will need to check if there is blockage preventing gas from coming out of the pilot orifice.
A thermcouple is what keeps pilot on, if your unit has both a thermocouple and thermopile then your pilot CAN stay lit and main burner not come on.do not buy a gas vavle untill you check the thermopile voltage!! very costy blunder.this is how you test it..( open circuit test) Disconnect thermopile leads from valve. take a volt meter set it to millivolts- set it to a mv reading above 500 so that you can test it correctly, my meter has 2000 setting and I use that. connect T/P leads to meter leads.. reading should be 500mv. ( closed circuit test) connect leads of meter to terminals that your thermostat or on/off swich are hooked too, usually top and bottom terminals on most gas valves, turn unit on and reading should be 150mv or more... you need try open circuit. I can test your vavle too if you like keep me posted if I helped or not. 15 yrs experience in gas repairs!!