Hitachi SAMURAI Series Service Manual page 124

4 Troubleshooting
Troubleshooting by alarm code
2C-2C
Alarm code
Alarm stop reason
Thermistor for detection of
water supply header temperature
2d-2d
Alarm code
Alarm stop reason
Thermistor for detection of
water return header temperature
116 SMGB0120 rev.0 - 11/2017
Water supply header temperature thermistor abnormality. (CN13)
indicates an abnormal value.
The connection and
insertion of connector
CN13 on PCBc (CPU PCB)
are correct
Yes
Remove the
connectors and
measure thermistor
resistance.
Is resistance value
normal?
Yes
Water return header temperature thermistor abnormality. (CN14)
indicates an abnormal value.
The connection and
insertion of connector
CN14 on PCBc (CPU PCB)
are correct
Yes
Remove the
connectors and
measure thermistor resistance.
Is resistance value
normal?
Yes
No
Revise connections
No
Replace thermistor
Replace PCBc
(CPU PCB)
No
Revise connections
No
Replace thermistor
Replace PCBc
(CPU PCB)