Otis · 400 Elevator
Indicates that the DMC is reporting a port sense error. This can be caused by obstructions blocking the port's LEDs or a malfunction of the port's detection components, preventing delivery detection.
Click steps to track your progress.
Check to make sure there are no obstructions blocking the LEDs in the delivery port.
Remove any items blocking the port sensors.
Check the connections between the port transmitter and receiver boards.
Replace the port detection cable if connections were found to be correct.
If replacing the cable does not correct the problem, replace the port receiver and transmitter boards.