Hitachi SAMURAI Series Service Manual page 115
Condenserless water chillers
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Also See for SAMURAI Series:
- Service manual (174 pages) ,
- Service manual (140 pages) ,
- Manual (118 pages)
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4. Troubleshooting
Troubleshooting by alarm code
C1-24
Alarm code
Alarm stop reason
Thermistor for detection of heat exchanger outlet (Tl) temperature indicates an abnormal value.
PCB monitoring position
PCBd (I/O PCB) CN24 (Liquid thermistor (Tl))
N O T E
Refer thermistor characteristics chapter
C1-25
Alarm code
Alarm stop reason
Thermistor for detection of heat exchanger outlet (Two2) (rear side = internal part of the heat exchanger) indicates an
abnormal value.
PCB monitoring position
PCBd (I/O PCB) CN25 (Outlet rear side thermistor (Two2))
N O T E
Refer thermistor characteristics chapter
108
SMGB0097 rev.0 - 07/2015
Liquid THM abnormality (CN24)
The connection and
insertion of connector
CN24 on PCBd (I/O PCB)
are correct
Yes
Remove he
connectors and
measure thermistor resistance.
Is resistance value
normal?
Yes
Outlet rear side THM abnormality (CN25)
The connection and
insertion of connector
CN25 on PCBd (I/O PCB)
are correct
Yes
Remove the
connectors and
measure thermistor resistance.
Is resistance value
normal?
Yes
No
Correction of connections
No
Replace thermistor
Replace PCBd (I/O PCB)
No
Correction of connections
No
Replace thermistor
Replace PCBd (I/O PCB)
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