Hitachi SAMURAI Series Service Manual page 150

4. Troubleshooting
Troubleshooting by alarm code
22-22
Alarm code
Alarm stop reason
Thermistor for detection of outdoor air temperature (Ta) indicates an abnormal value.
PCN monitoring position
PCBc (CPU PCB) CN6 (Ambient temperature (Ta))
N O T E
Refer thermistor characteristics chapter.
The connection and insertion of the connector
CN6 on PCBc (CPU PCB) is correct
Please remove the connector and measure
the resistance value. Is the resistance value
2C-2C
Alarm code
Alarm stop reason
Thermistor for detection of
water supply header temperature
142
SMGB0082 rev.1 - 07/2015
Ambient temperature thermistor abnormality (CN6)
Yes
normal?
Yes
Water supply header temperature thermistor abnormality
indicates an abnormal value.
The connection and
insertion of connector
CN13 on PCBc (CPU PCB)
are correct
Yes
Please remove
the connectors
and measure thermistor
resistance.
Is resistance value
normal?
Yes
No
No
No
Revise connections
No
Replace thermistor
Replace PCBc
(CPU PCB)
Revision of connections
Replacement of thermistor
Replacement of PCBc
(CPU PCB)