Service manual

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-103

Samsung Electronics

 Code

H2-4A20

 Error message

Mailbox door is open. Close it

 Symptom / Cause

Mailbox Motors doesn’t work.

Rear Door Opened, Micro Switch not assembled well or damaged, Harness Damaged. Main Board Damaged, door

ﬂ ag damaged.

 Troubleshooting method

1. Check the Rear Door Closed ﬁ rmly.

2. Check Mailbox Main Board Harness connection.

3. Check the Rear Door Switch Harness connection.

4. Check the Mailbox cover ﬂ ag damaged.

5. If the same problem happens after checking 1~4,

replace the mailbox main board.

6. If the same problem happens after checking 5,

replace the mailbox harnesses.