Troubleshooting Guide

Troubleshooting 39
Voltage protection
Voltage protection
Check whether the power
voltage is normal
.
Check whether the power
voltage is normal
.
Measure whether o
utdoor
terminal voltage
is normal
Measure whether o
utdoor
terminal voltage
is normal
Restart the unit when the power supply
gets normal
Restart the unit when the power supply
gets normal
No
Yes
No
Rec
onnect
it
well
Reconnect it well
Yes
Yes
No
Replace the IPM board
,
If the IPM board and
main board is in a board
,
replace the
outdoor main PCB
Replace the IPM board
, If the IPM board and
main board is in a board replace the
outdoor main PCB
Yes
Replace the PF
C module
(
If has
)
Replace the PFC module(If has)
No
Yes
Measure whether
the voltage
between
L
and N
is
normal
Measure whether the voltage
between L and N is normal
Yes
Measure whether input voltage
of
bridge rectifier
is normal
Measure whether input voltage
of bridge rectifier is normal
Yes
No
No
Measure whether
the voltage
between
P
and N
is
normal
refer to
9
.
Check Procedures
Measure whether
the voltage
between
P
and N
is
normal
refer to
9
.
Check Procedures
Replace the
bridge rectifier
Replace the bridge rectifier
No
Check whether
bridge
rectifier
is normal
Check whether
bridge
rectifier
is normal
Check the wiring of
r
eactor
or
inductance
Check the wiring of
r
eactor
or
inductance
Re
connect
the wiring
Reconnect the wiring
No
Check whether r
eactor
or
inductance
is normal
Check whether reactor
or inductance is normal
Yes
Replace r
eactor
or
inductance
Replace reactor or
inductance
No
C
heck the wiring of
power wires well or
correctly
Check the wiring of
power wires well or
correctly
Rec
onnect
it
well
Rec
onnect
it
well
C
heck the wiring of
L and N well or
correctly
Check the wiring of
L and N well or
correctly
Rec
onnect
it
well
Rec
onnect
it
well
C
heck the wiring of
bridge rectifier well
or correctly
Check the wiring of
bridge rectifier well
or correctly
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.