Checks / troubleshooting:
1. Is Switch Lever pressing the sensor while
Front cover is closed?
2. Is Cover sensor wobbly?
3. Are the cables of Cover sensor securely
connected?
4. Are Cover sensors damaged?
5. Check the operation of Front cover sensor
in “Sen : Cover” in the self-diagnosis
function.
6. MAIN board may be damaged.

Recommended actions:
Fix Switch Lever so that it presses the sensor.