Serial communication error
Mitsubishi Electric · Mitsubishi PUZ-HA30-36NHA4 Outdoor Unit
What does Ed (00) mean?
This error indicates a failure in serial communication. It can occur between the outdoor controller circuit board and the outdoor power circuit board, or between the outdoor controller circuit board and the M-NET board. Causes include broken wires, contact failures in connectors (CN, CNMNT, CND), defective communication circuits on the boards, or noise interference on the M-NET transmission wire.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Review the M-NET transmission wiring method for proper installation.
- 4
If communication between the outdoor controller and outdoor power board fails, replace the outdoor power circuit board.
- 5
If communication between the outdoor controller and outdoor power board fails, replace the outdoor controller circuit board.