Troubleshooting
212 Electrical Control System
2.4.2.8. E5 malfunction(For three phases units)
Voltage protection
Check the voltage of outdoor
unit power supply, whether the
voltage between L(1)
,L(2),L(3)and N is about
220VAC and between L(1)
,L(2),L(3) is about 380VAC
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
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