Hitachi RAC-25FXE Service Manual page 47

After turning on the power, perform air purification by remote control.
If there is not the air purifier and operating function,setting to 32
No
Is the LD301 turned on?
Yes
by the remote control,and operate in the cooling mode.
Is there 230V AC between
terminal boards L and N?
Yes
Abnormal
Is the 15/25 A fuse normal?
Yes
Abnormal
Is the power circuit normal? For details, see
the page on the power circuit.
Yes
Just in case, put the power on one
more time.
No
Ensure the power supply.
Normal
Has the breaker not been activated?
Breaker 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.)
No
Is the 3 A fuse
blown out?
Yes
Check the reversing valve refer to the
circuit of reversing valve drive circuit
Abnormal
The LD301 will not go on
and the power circuit is normal.
47
Breaker activated
Check for electrical leakage. After that,
turn on the breaker and make a double
-check.
Check the indoor electrical parts. (It may
have a power relay abnormality, communication
error or something similar.)
Replace the outdoor electrical parts.
Replace the outdoor electrical parts (in the case of
an abnormality in the power circuit).
Reversing valve
normal
Replace the outdoor electrical parts (in the case of
an abnormality in the power circuit).
Replace the outdoor electrical parts in reversing valve
drive circuit or reversing valve.
Replace the outdoor electrical parts
(in the case of an abnormality in the
microcomputer or LED).