SCD Burner Heating Issue - Value Fixed at 1263 C

We use 8355 SCD Detector. We always face issues with the burner heating. The set temp is 800 C and the actual value always show a fixed value of 1263 C. Is it the problem with the thermocouple? When we try to change the position of the thermocouple inside the burner, the temperature varies. Kindly advise

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