Remedy: Exit Cover 1 Is the Exit Cover opened? Yes Close it. Micro Switch DS5 2 Check the voltage at J204-16 on the DC Controller (PW7720) with a multi-meter. When it is opened, 5Vdc. When it is closed, 0Vdc. No 1. Check the wiring between switch and DC Controller. 2. If the wiring does not have any problem, replace the switch. DC Controller (PW7720) 2 Is it cleared by replacing DC Controller? Yes Replace PW7720.