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IPM module protection
IPM module protection
No
Is the power voltage normal?
Is the power voltage normal?
Yes
Is the outdoor terminal voltage
Is the outdoor terminal voltage
normal？
normal？
Yes
Is the voltage between L and N
Is the voltage between L and N
normal？
normal？
Yes
Is the input voltage of bridge
Is the input voltage of bridge
rectifier normal？
rectifier normal？
Yes
Is the voltage between P and
Is the voltage between P and
N properly wired according to
N properly wired according to
Appendix 3？
Appendix 3？
Yes
Is the connecting wire between
Is the connecting wire between
the main board and the IPM
the main board and the IPM
board connected tightly?
board connected tightly?
Yes
Is the connecting wire of the
Is the connecting wire of the
compressor is connected correctly
compressor is connected correctly
or tightly
or tightly
Yes
Is the outdoor unit ventilation
Is the outdoor unit ventilation
in working order?
in working order?
Yes
Is the outdoor fan running
Is the outdoor fan running
properly?
properly?
Yes
Replace IPM Board. Is the problem
Replace IPM Board. Is the problem
resolved?
resolved?
No
Replace the outdoor main PCB. Is
Replace the outdoor main PCB. Is
the problem resolved?
the problem resolved?
No
Is the compress is running
Is the compress is running
normally?
normally?
Yes
Check whether the refrigerant system is in
Check whether the refrigerant system is in
working order
working order
Electrical Control System
Restart the unit when the power supply
Restart the unit when the power supply
No
Are the power wires
Are the power wires
No
connected properly?
connected properly?
Are L and N wired
Are L and N wired
No
correctly?
correctly?
Is the bridge rectifier
Is the bridge rectifier
No
properly wired?
properly wired?
No
Reconnect the main board and
Reconnect the main board and
No
IPM board
IPM board
Reconnect he connecting wire
Reconnect he connecting wire
No
of the compressor
of the compressor
Make sure that the outdoor unit is
Make sure that the outdoor unit is
No
ventilating properly
ventilating properly
Refer to the solution for themalfunction
Refer to the solution for themalfunction
No
of the fan speed being out of control .
of the fan speed being out of control .
Find the cause and resolve the problem
Find the cause and resolve the problem
No
Replace the compressor
Replace the compressor
returns to normal
returns to normal
Reconnect the power
Reconnect the power
wires
wires
Reconnect L and N
Reconnect L and N
Reconnect the bridge
Reconnect the bridge
rectifier
rectifier
Is the bridge rectifier
Is the bridge rectifier
operating normally?
operating normally?
Yes
Replace the PFC module(If This has not been
Replace the PFC module(If This has not been
done already)
done already)
No
Are the reactor or
Are the reactor or
Inductance wired properly?
Inductance wired properly?
Yes
Are the reactor or
Are the reactor or
inductance normal?
inductance normal?
Yes
Troubleshooting
No
Replace the bridge rectifier
Replace the bridge rectifier
No
Reconnect the wiring
Reconnect the wiring
Replace reactor or
Replace reactor or
No
inductance
inductance
140
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