Midea MCD-18HRFN1-QRC8 - E5 malfunction (For three phases units)

Troubleshooting
Electrical Control System 143
2.4.4.6. E5 malfunction (For three phases units)
Voltage protection
Check whether the voltage
range of P-N on IPM module is
normal? DC277-356V for 18K/
24KBtu/h; DC277-410V for
36KBtu/h
Check the power supply
Check whether the voltage
range of P-N on IPM module is
normal? DC 350-650V
Replace bridge rectifiers,
and then check whether the
system can run normally
Replace IPM board, and
then check whether the
system can run normally
Replace outdoor main board
Yes
No
No
No
No
Yes
Trouble is solved
Yes
Yes
E5 display
Replace the power board,
then check whether the
system can run normally
No
Yes