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

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