Hitachi RAC-18WPC, Service Manual, Page: 33 / 43

Chec
king the electrical par
ts of the outdoor unit
After turning on the power, perform air purification by remote control.
Is the LD301 turned on?
Yes Yes
Yes
Yes
Yes
No No
No
Is there 230V AC between
terminal boards L and N?
Ensure the power supply.
Abnormal
Abnormal
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 15/25 A fuse normal?
If the 15/25 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 the power circuit normal? For details, see
the page on the power circuit. Is the 3 A fuse
blown out?
Replace the outdoor electrical parts (in the case of
an abnormality in the power circuit).
normal
Just in case, put the power on one
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).
Check the indoor electrical parts. (It may
have a power relay abnormality, communication
error or something similar.)
Replace the outdoor electrical parts (in the case of
an abnormality in the power circuit).
Reversing valve
Abnormal
Check the reversing valve refer to the
circuit of reversing valve drive circuit
more time.
Replace the outdoor electrical parts in reversing valve
drive circuit or reversing valve.
33