Hitachi RAC-18WPC, Service Manual, Page: 35 / 43

The LD301 blinks 10 times.
Power supply voltage error
The LD301 blinks 7 times.
Thermistor abnormality
The LD301 blinks 6 times.
OH thermistor rise
The LD301 blinks 16 times.
High load stop
Is there AC 220 -230V between
terminal boards L and N?
Check the power supply.
Is there a voltage of DC 264-358 V ?
For measuring points, see the instruction plate on the lid of the
electrical parts.
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
Replace the outdoor electrical parts
(in the case of an abnormality in the
voltage detection circuit).
Check for loose or poorly inserted thermistors. Connect the thermistors.
Check the thermistors for wire breaks and short-circuits.
Replace any abnormal
thermistors.
Replace the outdoor electrical parts
(in the case of an abnormality in the thermistor
detection circuit).
Check the OH thermistor for wire breaks and short-circuits.
Replace the OH thermistor.
Check if the OH thermistor is not loose or poorly inserted.
Connect the OH thermistor.
Normal
Normal
Normal
Normal
Normal
Review the freezing cycle.
(Refrigerant leakage or other
reason is conceivable.)
If reviewing the freezing cycle does not
correct the problem, replace the outdoor
electrical parts (in the case of an
abnormality in the thermistor detection circuit).
The OH thermistor has
detected heat-up in the
compressor.
The current of the compressor over the
upper limit.So, it stopped.After(3 minutes)
restart.
Yes
No
Yes
Yes
Yes
No
No
No
* Restart again.If keep opertaion,no problem.
AC 187-253 V
AC 187 V or less, AC 253 V or more
Check for loose or
poorly insert the
reactor
Ifyon confirm the connect of the reactor
wire, And it is ok, please change the
reactor.
Change the outdoor ele unit [circuit
abnormal]. .
No
35