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Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
Y
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
dirty? If they are
obstructed by other
objects which affect
the heat exchange
of indoor and
outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
Use AC voltmeter
to measure the
voltage between
Y
terminal L and N
on the wiring
board XT)
Voltage between
the two ends of celectrolytic
capacitor is higher
ends of electrolytic
than250V
capacitor on control
N
Stop the unit and
disconnect the power
supply. Then, check
the connection of
capacitor C2
according to Electrical
Wiring Diagram.
Stop the unit and
Remove the wires
disconnect the power
on the two ends of
supply. Wait 20 minutes,
capacitor C2. Then,
or use DC voltmeter to
use capacitance
measure the voltage
meter to measure
between the two ends of
the capacitor C2.
capacitor C2, until the
Verify as per the
voltage is lower than 20V
Parameters Sheet.
Replace the capacitor
If capacitor
C2. Then, energize
Y
C2 is failed?
and start the unit.
Replace the
N
control panel AP1
If there is any
abnormality
Y
described above?
N
Connect the control panel
AP1 and compressor
COMP correctly according
Y
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
If the
resistance is
N
normal?
Resistance higher
than 500MΩ?
Y
Replace the
control panel
AP1
END
If the voltage
between terminal L
and N on wiring board
N
XT is within 210VAC
210VAC~250VAC
~250VAC?
Y
Restart the unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
N
between the two
panel AP1
Reconnect the
capacitor C2 according
to Electrical Wiring
The connection
Y
Diagram. Then,
of capacitor C2
Restart the
is loose.
unit.
N
N
Take corrective actions
according to Technical
Service Manual, and
then energize and start
the unit.
Replace the
control panel AP1
If the unit can
work
normally?
Replace the
compressor
COMP
N
Check the supply
voltage and
restore it to
If the unit can
Y
work
normally?
If the unit can
Y
work normallv?
If the unit can
Y
work normally?
N
If the unit can
Y
work normally?
N
Y
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