What It Means
Serial communication signal transmission error detected at the outdoor unit.
Mitsubishi Electric All Systems
Mitsubishi Electric Error Code Ed
Troubleshooting guide for the Mitsubishi Electric system fault Ed.
Possible Causes
- Outdoor unit serial communication error.
- Outdoor main control board serial interface fault.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Error detail Serial transmission error. Inspected unit Outdoor.
All Recorded Causes
Verify Before Replacing Parts
- Confirm the exact Mitsubishi Electric model family and default context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Mitsubishi Electric fault points at the most likely cause listed above.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out the next candidate on the list.
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this Mitsubishi Electric code is on?
ACLogics has guided diagnostics for 73 Mitsubishi Electric fault codes and asks the right questions to narrow it down.
