Midea M2OC-18HFN1-M Service Manual page 70

9.4.2.6 E6(PFC module protection) error diagnosis and solution. (Only for M4OC-36HRFN1-M)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
PFC module protection
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Yes
Check whether the voltage
range of P-N on IPM
module is normal? DC277-
356V for 18-27KBtu/h;
DC277-410V for 36KBtu/h
No
Check whether
inductance of PFC module
is good? If the inductance is
good, the resistance of the
two ports is 0
Yes
Replace the PFC module
E6
When the voltage signal that PFC sends to main control board
is abnormal, the display LED will show "E6" and AC will turn
off.
● Wiring mistake
● Outdoor PCB faulty
● Inductance of PFC module faulty
●
PFC module malfunction
Connect it tightly, check
No
No
Replace the outdoor main board
Yes
the
No Replace the inductance
normal or not
Trouble is solved
Yes