Outdoor Control System Memory Error
Mitsubishi · MSZ-FH06-18NA Heat Pump System
What does 7-time blink 2.5-second OFF mean?
This error indicates that the inverter P.C. board or the outdoor electronic control P.C. board cannot properly read data from its nonvolatile memory. This signifies a corrupted or inaccessible memory on the outdoor control board, critical for compressor control and overall unit coordination. If this issue is not resolved, the outdoor unit will be unable to operate, making the entire system non-functional.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Ensure all wiring harnesses and connectors attached to these control boards are firmly seated.
- 4
If the fault persists after these diagnostic steps, replace the identified faulty inverter P.C. board or outdoor electronic control P.C. board as per the outdoor unit service manual.