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Output lights on display indicate opposite of actual output.

I have a eurotherm 2216e temperature controller, and when the OP1 light is on, there is no output to my heating element. When the OP1 light is off, there is an output, and the heater ramps up.

This behavior is also reflected directly on the back of the temperature controller: when the OP1 light is off, there is a voltage across pins 1A and 1B, and when OP1 is on, there is no voltage across 1A and 1B.

What might be the problem here?
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