Hitachi SAMURAI Series Service Manual page 123

4 Troubleshooting
Troubleshooting by alarm code
11-11
Alarm code
Alarm stop reason
Thermistor for detection of inlet water temperature (Twi) indicates an abnormal value.
PCB monitoring position
PCBc (CPU PCB) CN4 (Inlet water temperature thermistor (Twi))
?
N O T E
Refer thermistor characteristics chapter.
The connection and insertion of the connector
CN4 on PCBc (CPU PCB) is correct
Remove the connector and measure
the resistance value. Is the resistance value
12-12
Alarm code
C1-12
Alarm stop reason
Thermistor for detection of outlet water temperature (for water temperature control Two1) indicates an abnormal value.
PCB monitoring position
PCB (CPU PCB) CN5 (Outlet water temperature thermistor (Two1))
c
?
N O T E
Refer thermistor characteristics chapter.
The connection and insertion of the connector
CN5 on PCBc (CPU PCB) is correct
Remove the connector and measure
the resistance value. Is the resistance value
115 SMGB0120 rev.0 - 11/2017
Inlet water temperature abnormality (CN4)
Yes
normal?
Yes
Outlet water temperature THM abnormality (CN5)
No
Yes
normal?
Yes
No
Revision of connections
No
Replacement of thermistor
No
Replacement of PCBc
(CPU PCB)
Revision of connections
Replacement of thermistor
Replacement of PCBc
(CPU PCB)
4