I changed the thermocouple in the converter and the Temp controller is reading all LLLLs. What did i do wrong?

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I changed the thermocouple in the converter and the Temp controller is reading all LLLLs. What did i do wrong?

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LLLLs mean that the FUJI temp controller is reading too low a temperature and will not try and heat the converter. Typically this is set at 0 deg C as it leaves the factory. If the thermocouple wires are backwards it will essentially be reading a negative temp, -25 if room temp. So if the room is warm, the wires must be reversed.

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