Midea M2OD-14HFN1-Q Service Manual page 56

10.3.2.7 Current protection of compressor (ODU P3)
Current protection of compressor
Judge 1: Check whether the
input current of the power
supply wire is higher than max
protection current value
Yes
Check whether
the refrigerant
system is ok
Judge 2: Check whether the
outdoor ambient
temperature is higher than
50℃
No
Judge 3: Check whether the
outdoor unit is bad ventilation
No
Judge 4: Check whether the
heat exchanger is dirty
No
Judge 5: The refrigerant
pipe is blocked
No
Replace outdoor main
board,and check whether
the system can run normally
No
Replace the electric control box
M2OD-16H M2OD-18HFN1
Model
FN1-Q -Q(W190)
Max
prote
ction
11A 14A
curre
nt
Yes Stop the unit
Yes Make the outdoor unit ventilate well
Yes Clean the heat exchanger
Let the refrigerant out, then use the high
Yes pressure nitrogen or refrigerant to blow pipe,
vacuumize and charge the refrigerant again
Yes
Yes Trouble is solved
M2OD-18H M2OD-14H M3OD-21H
FN1-Q FN1-Q FN1-Q
15A 14A 15A
M3OD-26H M3OD-27H M4OD-28H
FN1-Q FN1-Q FN1-Q
15A 18.5A 18A
M4OA-36H M5OC-36H M5OD-42H
FN1-Q FN1-Q FN1-Q
23A 23A 25A