innovair ICS0736C21 Service Manual page 83

2.4.2.5. E5 malfunction(For single phase units)
E5 display
E5 display
Voltage protection
Voltage protection
Check whether the power
Check whether the power
voltage is normal.
voltage is normal.
Yes
Measure whether outdoor
Measure whether outdoor
terminal voltage is normal？
terminal voltage is normal？
Yes
Measure whether the voltage
Measure whether the voltage
between L and N is normal？
between L and N is normal？
Yes
Measure whether input voltage
Measure whether input voltage
of bridge rectifier is normal？
of bridge rectifier is normal？
Yes
Measure whether the voltage
Measure whether the voltage
between P and N is normal
between P and N is normal
refer to the Appendix 3？
refer to the Appendix 3？
Yes
Replace the IPM board, If the IPM board
Replace the IPM board, If the IPM board
and main board is in a board, replace the
and main board is in a board, replace the
outdoor main PCB
outdoor main PCB
Electrical Control System
Restart the unit when the power
Restart the unit when the power
No
supply gets normal
supply gets normal
Check the wiring of
Check the wiring of
No
power wires well or
power wires well or
correctly
correctly
Check the wiring of
Check the wiring of
No L and N well or
L and N well or
correctly
correctly
Check the wiring of
Check the wiring of
No
bridge rectifier well
bridge rectifier well
or correctly
or correctly
Check whether
Check whether
No bridge rectifier is
bridge rectifier is
normal
normal
Yes
Replace the PFC module(If has)
Replace the PFC module(If has)
No
Check the wiring of
Check the wiring of
reactor or inductance
reactor or inductance
Yes
Check whether reactor
Check whether reactor
Yes
or inductance is normal
or inductance is normal
Reconnect it well
Reconnect it well
Reconnect it well
Reconnect it well
Reconnect it well
Reconnect it well
Replace the bridge
Replace the bridge
No
rectifier
rectifier
Reconnect the
Reconnect the
No
wiring
wiring
Replace reactor or
Replace reactor or
No
inductance
inductance
Troubleshooting
79