Hitachi SAMURAI Series Service Manual page 107

4 Troubleshooting
Troubleshooting by alarm code
C1-L1
Alarm code
Alarm stop reason
Suction pressure (Ps) becomes lower than 0.14MPa for more than 90 seconds. (Electronic control, only enabled in
cooling)
?
N O T E
Causes alarm stop with 3 occurrences in 30 minutes. Retry control is performed until the second one. (Compressor stops, and restarts
automatically after 3 minutes)
Retry indication
LCD: By touching "Inspection", "Ps Retry" is shown in "No.1 Cycle".
Retry code
C1-P6
PCB monitoring position
PCBd (I/O PCB) CN32PS (Suction pressure sensor)
Low pressure
has actually dropped to
activation value
No
The connection and
insertion of connector
CN32PS to PCB (I/0 PCB)
d
are correct
Yes
There are
problems with the
characteristics of pressure
sensor
No
(There are no problems)
Check of PCB (I/O PCB)
d
99 SMGB0120 rev.0 - 11/2017
Low pressure interruption control
Yes
The stop valve
liquid line is closed
No
Revision of
connections
Yes
(There are problems)
Replacement of
pressure sensor
Yes
Open the stop valve
No
Lack of refrigerant. Gas leakage
Clogging. Malfunction of
expansion valve
Clogging of low pressure side
pipes
Malfunction of check valve
Insufficient volume of water
Reverse rotation of pump
Air mixture
Clogging of strainer
Excessive humidity in refrigerant
Formation of lime deposit in water
side heat exchanger
4