Was the protection activated
in standby?
Was the protection activated
in standby?
Yes
Yes
Is the current normal？
Is the current normal？
Yes
No
Replace the outdoor main PCB
Replace the outdoor main PCB
Is the power voltage is normal?
Is the power voltage is normal?
Is outdoor terminal voltage
normal？
Is outdoor 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 wiring
Reconnect the
power wiring
Yes
Is the voltage between L and N
is normal？
Is the voltage between L and N
is normal？
Yes
Is the input voltage of the
bridge rectifier is normal？
Is the input voltage of the
bridge rectifier is normal？
No
No
Is the power wiring
wired correctly?
Is the power wiring
wired correctly?
Reconnect L and N
Reconnect L and N
Are L and N wired
properly?
Are L and N wired
properly?
Reconnect the
bridge rectifier
Reconnect the
bridge rectifier
Is the bridge
rectifier wired
properly?
Is the bridge
rectifier wired
properly?
No
No
Yes
Replace the PFC 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
normal refer according to
Index？
Is the voltage between P and N
normal refer according to
Index？
Replace the bridge rectifier
Replace the bridge rectifier
No
Is the bridge rectifier
functioning normally?
Is the bridge rectifier
functioning normally?
Is the wiring of the
reactor or inductance
properly wired?
Is the wiring of the
reactor or inductance
properly wired?
Reconnect the wiring
Reconnect the wiring
No
Are the reactor and
inductance functioning
normally
Are the reactor and
inductance functioning
normally
Yes
Replace reactor or
inductance
Replace reactor or
inductance
No
Is the outdoor ambient
temperature is higher than
50℃?
Is the outdoor ambient
temperature is higher than
50℃?
No
Stop the unit
Stop the unit
Yes
Is the outdoor unit
ventilation functioning
properly?
Is the outdoor unit
ventilation functioning
properly?
Yes
Ensure that the outdoor unit ventilate
is working properly
Ensure that the outdoor unit ventilate
is working properly
Is the heat exchanger dirty?
Is the heat exchanger dirty?
No
Clean the heat exchanger
Clean the heat exchanger
Yes
Check whether the refrigerant
system is running normally
Check whether the refrigerant
system is running normally
Replace outdoor main
board. Does a problem still
exist?
Replace outdoor main
board. Does a problem still
exist?
No
No
Is the outdoor fan running
properly?
Is the outdoor fan running
properly?
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
Please refer to the solution of the
"fan speed is operating outside of
the normal range" malfunction.
No
Yes
No
Yes
Yes
Is system pressure too high?
Is system pressure too high?
Recycle the overcharged
refrigerant
Recycle the overcharged
refrigerant
Yes
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
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