The error message 'Door Open. Close Cartridge Access Door' displays on the front control panel of the unit. This error will appear when the door sensor is unable to detect that the door has been closed. The door sensor is a micro switch that sits below the mid-chassis. A rib on the Cartridge Access Door drops below an opening in the mid-chassis to trip a metal lever of the door sensor, which in turn activates the switch.
Figure : Open Door Position
If you are experiencing the error message, 'Door Open. Close Access Door', when the access door is properly closed, it is likely that you have a faulty door sensor.
Figure : Closed Door Position
Some symptoms of a faulty door sensor are:
'Door Open. Close Cartridge Access Door' error message displays continously even when the door is fully closed.
No audible click of the switch when the door seats flush.
No visible metal lever in the mid-chassis opening.
These symptoms might be caused by other issues. The instructions provided below will not resolve every issue that might cause these symptoms.