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OK if flame is going off, we have one of 5 issues.
1. Tilt switch open
2. Wiring of thermocouple
3. Defective thermocouple
4. Defective tilt switch
5. Defective gas valve
The most common is a dirty thermocouple built up with carbon.Use a dollar bill or fine sandcloth and clean thermocouple and lets see if that solves the problem.If not we will go from there.
If you are not familiar with the thermocouple it is here