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Checking the electrical parts of the outdoor unit
After turning on the power, perform air purification by remote control.
※Immediately after power-on, the operation relay of the indoor unit is not turned on. The outdoor unit will therefore not be powered.
Is the LD301 turned on?
Ye s Ye s
Ye s
Ye s
Ye s
Ye s
No No
No
Is there 220V AC between
terminal boards A and B?
Ensure that the F cable is
correctly connected.
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
Correct the F cable connection.
Normal
Normal
Breaker activated
Breaker normal
Has the breaker not been activated?
Check for electrical leakage. After that,
turn on the breaker and make a double
-check.
Is the 25 A fuse normal?
If the 25 A fuse is blown out, it may
have caused another part to go out
of order. Please take care. (The
main parts which may be in such a
state are the varistor, diode stack,
IPM and smoothing capacitor.)
Replace the outdoor electrical parts.
Is there a voltage of 264-358V DC? For the
measuring points, see the instruction plate
on the lid of the electrical parts.
Check the connection of the reactor line
and for wire breaks in the reactor.
Correct the connection of the reactor line
or replace the reactor.
Replace the outdoor electrical parts
(in the case of an abnormality in the diode
stack or smoothing capacitor).
Is the power circuit normal? For details, see
the page on the power circuit.
Is the F4 (2 A fuse)
blown out?
Replace the outdoor electrical parts (in the case of
an abnormality in the power circuit).
Check the outdoor fan motor. (For
details, see the page on the outdoor fan
motor or the instruction plate on the lid of
the electrical parts.)
Outdoor fan
motor normal
Replace the outdoor electrical parts alone (in the
case of an abnormality in the power circuit or fan
motor drive circuit).
Abnormality in the outdoor fan motor
Just in case, turn the power back on
and perform air purification.
The LD301 will not go on
and the power circuit is normal.
Replace the outdoor electrical parts
(in the case of an abnormality in the
microcomputer or LED).
Replace the outdoor electrical parts and outdoor
fan motor (in the case of an abnormality in the fan motor
and fan motor drive circuit).
Check the indoor electrical parts. (It may
have a power relay abnormality, communication
error or something similar.)
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