Midea M2OC-18HFN1-M Service Manual page 44

PIC3 :Main board LED when power on and unit
standby.
PIC 4: Check point button, press 1 time for check
how many indoor units are connected.(for M2OC-
18HFN1-M, M2OD-18HFN1-M,M3OD-27HRDN1-
M,M3OC-30HRFN1-M,M4OC-36HRFN1-M)
Check point button, press 18 times for check how
many indoor units are connected.(for M2OC-
18HRDN1-M,M3OC-27HRDN1-M,M4OC-36HRDN1-
M)