Thermocouple AD597 (595) decreases to zero all the time

I am using a Megatronics v2.0 with a ExtThermoCouple 1.0. in a big  delta printer.
I have to use this thermocouple extension board and connected it to the serial port/ aux1
Every time i connect the printer to repetier Host it starts with the correct reading of the temperature, but this reading doesn't change. When i give the M203 S0 G-code the temperature reading falls to zero. The extruder is heating up and when i check the output from the thermocouple and the extender, the outputs are correct, so the Megatronics gets the right input, but Repetier Host or Megatronics mobo doesn't interpret this info.

part of configuration.h


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