If you have cycled the power three times and still see "E6" or "E7" on the remote, the issue is likely hardware, not logic.
If the method above does not work, try this sequence commonly found on Pajero and older Outlander models.
The Mitsubishi Multi Communication System Reset is not a voodoo ritual; it is a structured diagnostic procedure. In 95% of cases involving communication errors (E6, E7, 6600, or "Please Wait" loop), a simple 60-second power cycle at the breaker is the magic bullet.
However, if you find yourself performing this reset weekly, stop. You have a systemic issue—likely noisy power, a failing outdoor main board (capacitor leak), or a water-damaged indoor communication harness.
When in doubt, call a Mitsubishi Diamond Contractor. They have the MNET TOOL (PAC-USB-001) diagnostic software that can map the network and identify exactly which byte of data is corrupt.
But for the homeowner or facility manager stuck with a frozen AC on a hot day: Cut the breaker, wait one minute, flip it back on. Nine times out of ten, that is all the "reset" your Mitsubishi Multi Communication System will ever need.
Disclaimer: This guide is for informational purposes. Working with electrical panels and PCB boards carries a risk of shock or equipment damage. If you are uncomfortable performing these steps, hire a licensed HVAC professional.
This is a comprehensive, deep-dive guide on resetting the Mitsubishi Multi-Communication System (MMCS).
The Mitsubishi MMCS is the proprietary infotainment system found in models like the Outlander, Pajero/Montero, Lancer Evolution, ASX/Outlander Sport, and i-MiEV. These systems are notorious for software glitches, GPS lock-ups, and screen freezes.
This guide covers the hierarchy of resets, ranging from a "soft reboot" to a "hard factory reset."
For long communication runs (over 500 meters), you need a termination resistor. On the outdoor board, a jumper called CN41 must be set to "ON" for the last outdoor unit in the chain. If plugged in incorrectly, the signal reflects and corrupts the reset. Remove the CN41 jumper if your system is short and simple.
This clears EEPROM (permanent memory). You will lose address settings, filter signs, and group control configurations. Only do this if the soft reset fails.
Use this when: The screen is frozen, the GPS is lagging, or the system is unresponsive. This cuts power to the system's volatile memory, forcing a fresh boot, much like restarting a computer.
