MrCool DIY-MULTI2-18HP230C, Руководство по обслуживанию

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 Troubleshooting 37 
IPM module protection
IPM module protection
Yes
Is the power voltage normal?
Is the power voltage normal?
Is the outdoor terminal voltage
normal
？
Is the 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 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?
Reconnect L and N
Reconnect 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 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
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 reactor or
Inductance wired
properly?
Are the reactor or
Inductance wired
properly?
Reconnect the wiring
Reconnect the wiring No
Are the reactor or
inductance normal?
Are the reactor or
inductance normal?
Yes
Replace reactor 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?
Reconnect 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
themalfunction 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 compress is
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
Reconnect he connecting
wire of the compressor
Reconnect he 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.