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Eurotherm 2116 can not change set point

I have a 2116 installed in a Thermo Scientific muffle furnace. When I turn the furnace on it heats to 500 C and controls at that temp. However, I cannot change the set point. I have the manual but none of the commands do anything or display anything other the temperature the furnace is at.
Is it possible that the controller is locked? Or is it simply broken?
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