Hitachi RAW-35RHC - Page 73

6 Troubleshooting
Outdoor unit
SMGB0135 rev.0 - 06/2020
65
6
No
No
No
No
No
Yes
Yes
Yes
LD301 blinks 10 times.
LD301 blinks 7 times.
Check for loose or poorly inserted thermistors.
Check the thermistors for wire breaks and short-circuits.
Check whether the OH thermistor is loose or poorly inserted.
Check the OH thermistor for wire breaks and short-circuits
LD301 blinks 6 times.
LD301 blinks 16 times
Compressor stopped since current exceeded
the threshold value due to high load. It
restarts after a xed time (3 minutes).*
An increase of compressor
temperature has been
detected by the OH
thermistor.
* This is not a failure in case that
operation continues after restarting.
Inspect the refrigerating cycle.
(It may be due to a cause such
as refrigerant leakage)
Replace the OH thermistor.
Fix the connection of the
OH thermistor.
Replace any abnormal
thermistors.
Fix the connection of the
thermistors.
In case that inspecting the refrigerating cycle
does not help to solve the problem, replace
the outdoor electrical parts (due to abnormality
in the thermistor detection circuit).
Increase of compressor
temperature
High load stop
Thermistor abnormality
AC voltage between 187 and 253 V
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
Normal
Normal
Normal
Normal
Normal
AC voltage lower than 187 V or greater than 253 V
Power supply voltage error
Check the power supply.
Check for
loose or poorly
inserted reactor.
Check the connection of the
reactor wire. If it is OK, please
replace the reactor.
Is there a voltage of AC 220-230 V
between terminal boards L and N?
Is DC voltage between 264 and 358 V? Refer to
the label on the cover of the electrical parts for the
measuring points.
Replace the outdoor electrical
parts (due to circuit abnormality).
Replace the outdoor electrical
parts (due to abnormality in the
thermistor detection circuit).
Replace the outdoor electrical
parts (due to abnormality in the
voltage detection circuit).
Yes
LD301 blinks 5 times.
Yes
Yes
Yes
Abnormal
Abnormal
Normal
Normal
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
LD301 blinks 4 times
LD301 blinks 3 times.
LD301 blinks twice
Peak current cut
Abnormally slow rotation
Switchover failure
Exceeded the lower limit of
overload
Operation stopped
due to heavy load of
the compressor.
Is the heat exchanger of the outdoor unit clogged
or are its surroundings blocked by something?
This is a failure in starting up the
compressor. Check the compressor
connectors for looseness and continuity.
Operation stopped due to the detection of
abnormality by the compressor control. It
may be an abnormality of the drive circuit
in case of heavy load.
Operation stopped due to the detection of
abnormality by the compressor control. It may be an
abnormality of the compressor and an abnormality of
the drive circuit in case of heavy load.
Is there any abnormality in the refrigerating cycle?
Is the service valve open?
Check the compressor
for loose connectors and
continuity of the cord.
Is a leakage breaker
installed?
Is the insulation of the compressor
normal? Check it with a megger.
Replace the parts found to be
defective based on the results of
the “self-check” evaluation.
Replace the compressor and
inspect the outdoor electrical
parts.
Fix the point of
abnormality.
Open the service valve
Conduct a “self-check”
Remove the cause of the
problem.
Fix the point of abnormality.