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If you are sure that the wiring is correct then you should use
the test mode to see if one or both of the sensors are operating
correctly. Do this by powering down the unit and removing
all jumpers. Install one jumper on the pair of pins marked ‘T’.
Apply power to the unit. You should see the jumper option
message ‘oP.0’. Then you will see one of the following
displays:
L.1.L => both sensors are working correctly
H.1.H => both sensors are either disconnected or ‘in the dark’
H.1.L or L.1.H => one sensor is ‘dark’ while the other is not.
For example, if the sensor is working properly you will see:
Wrong!
Correct
