Hitachi RAW-35RHC - Page 83

6 Troubleshooting
Troubleshooting by protection code (Outdoor unit)
SMGB0135 rev.0 - 06/2020
75
6
Protection
code
P104
Compressor changeover failure (switching failure)
• Outdoor unit LED301 blinks 4 times
• This protection code is displayed 3 times before alarm 104 appears at the LCD controller.
Yes
Yes
Abnormal
Abnormal
Normal
Normal
No
No
LD301 blinks 4 times
Switchover failure
This is a failure in starting up the
compressor. Check the compressor
connectors for looseness and continuity.
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”
Protection
code
P105
Lower limit of compressor overload
• Outdoor unit LED301 blinks 5 times
• This protection code is displayed 3 times before alarm 105 appears at the LCD controller.
LD301 blinks 5 times.
Yes
Yes
Abnormal
Abnormal
Normal
Normal
Yes
Yes
No
No
No
No
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?
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.