Mitsubishi Electric PL18FK2 Service And Parts Manual page 81

6. WRONG WIRING ON SITE
6-1 Between remote controller and indoor unit
If wire is disconnected between the remote controller and the indoor unit, the POWER ON display does not appear despite
turning the power switch ON. The beep sound is not heard, either.
6-2 Phenomena due to wrong wiring between indoor and outdoor units
Wrong wiring
1
Thermostat
Indoor unit Outdoor unit
Disconnect between 1 and 1 or
2
and 2.
1
OFF
Phenomena
The outdoor unit stops.
Operation stops. 9 minutes later, the check code "P8" appears on the
remote controller display.
Operation stops.
9 minutes later, the check code "P8" appears on the remote controller
display.