Hitachi SAMURAI Series Service Manual page 117

4. Troubleshooting
Troubleshooting by alarm code
C1-27
Alarm code
Alarm stop reason
Discharge pressure sensor (Pd) of compressor indicates an abnormal value.
PCB monitoring point
PCBd (I/O PCB) CN31PD (Discharge pressure sensor (Pd))
N O T E
Refer pressure sensor characteristics chapter.
The connection and insertion of connector
CN31Pd on PCBd (I/O PCB) are correct
DC5V is being supplied between pin 1 and pin
3 of connector CN31Pd on PCBd (I/O PCB)
Is the voltage between pin 2 and pin 3
of connector CN31Pd on PCBd (I/O PCB)
lower than DC0.5V or higher than DC4.5V when
discharge pressure sensor is connected?
There is clogging inside the connection pipe of
discharge pressure sensor
Replacement of discharge pressure
110
SMGB0097 rev.0 - 07/2015
Discharge Pressure Sensor Abnormality (CN31)
Yes
Yes
Yes
No
sensor
No
No
No
Yes
Revision of connections
Replace PCBd (I/O PCB)
Replace PCBd (I/O PCB)
Elimination of the factors
for clogging inside the
pipe