Troubleshooting Guide

Troubleshooting 37
IPM module protection
IPM module protection
Yes
Is the power voltage normal
?
Is the power voltage normal
?
Is the
o
utdoor terminal voltage
normal
Is the
o
utdoor terminal voltage
normal
Restart the unit when the power supply
returns to normal
Restart the unit when the power supply
returns to normal
No
Yes
No
Reconnect
the
power wires
Reconnect the
power wires
Yes
Is
the voltage between
L
and N
normal
Is the voltage between L and N
normal
Yes
Is the
input voltage of
bridge
rectifier
normal
Is the input voltage of bridge
rectifier normal
No
No
Are the power wires
connected properly
?
Are the power wires
connected properly?
Rec
onnect
L and N
Rec
onnect
L and N
Are L and N wired
correctly
?
Are L and N wired
correctly?
Reconnect
the
bridge rectifier
Reconnect
the
bridge rectifier
Is the bridge rectifier
properly wired
?
Is the bridge rectifier
properly wired?
No
No
Yes
Replace the PF
C module
(
If
This
has
not
been done already
)
Replace the PFC module (If this has not
been done already)
No
Is
the voltage between
P
and N
properly
wired
according to
9
.
Check Procedures
Is
the voltage between
P
and N
properly
wired
according to
9
.
Check Procedures
Replace the
bridge rectifier
Replace the bridge rectifier
No
Is the
bridge rectifier
operating
normally
?
Is the
bridge rectifier
operating
normally
?
Are the
r
eactor
or
Inductance wired
properly
?
Are the
r
eactor
or
Inductance wired
properly
?
Re
connect
the wiring
Reconnect the wiring
No
Are the
r
eactor
or
inductance
normal
?
Are the reactor or
inductance normal?
Yes
Replace r
eactor
or
inductance
Replace reactor or
inductance
No
Is the connecting
wire
between the main board and
the IPM
board
connected
tightly
?
Is the connecting
wire
between the main board and
the IPM
board
connected
tightly
?
Rec
onnect
the main board
and IPM board
Reconnect the main board
and IPM board
No
Is the outdoor unit
ventilation in working order
?
Is the outdoor unit
ventilation in working order?
Yes
Make sure
that the outdoor unit is
ventilating properly
Make sure
that the outdoor unit is
ventilating properly
Check whether the refrigerant system is
in working order
Check whether the refrigerant system is
in working order
No
Is the outdoor fan running
properly
?
Is the outdoor fan running
properly
?
Refer to the solution for
themalfunction of the fan speed
being out of control
.
Find the cause
and resolve the problem
Refer to the solution for
the malfunction of the fan speed
being out of control . Find the cause
and resolve the problem
No
Yes
No
Yes
Yes
Is
the compress is
running
normally
?
Is the compressor
running normally?
Yes
Replace the compressor
Replace the compressor
No
Replace
IPM
Board
.
Is the problem
resolved
?
Replace
IPM
Board
.
Is the problem
resolved
?
Replace
the
outdoor main
PCB
.
Is
the problem resolved
?
Replace the outdoor main PCB. Is
the problem resolved?
No
Is the connecting
wire
of the
compressor is connected
correctly or tightly
Is the connecting
wire
of the
compressor is connected
correctly or tightly
Rec
onnect
he connecting
wire of the compressor
Reconnect the connecting
wire of the compressor
No
Yes
Yes
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.