Hitachi SAMURAI Series Service Manual page 128

4 Troubleshooting
Troubleshooting by alarm code
40-40
Alarm code
Alarm stop reason
The connection of wiring for transmission between modules (Transmission line between master and slaves) and the
transmission wiring for connection of group controller is mixed.
Retry indication
No retry
PCB monitoring position
PCBc (CPU PCB) CN2 (Transmission port between modules)
PCBc (CPU PCB) CN300 (Transmission port for group controller)
6E-6E
Alarm code
Alarm stop reason
Suspension of water supply protection switch is activated.
PCB monitoring position
PCBc (CPU board) PCN10
Hot-and-chilled water
is flowing with an amount
of flow higher than the usage
Remove the wiring
attached to connector PCN10
on PCBc (CPU PCB) and check
conductivity. Is there any
The connection and
insertion of connector PCN10
on PCBc (CPU PCB) are
Check of PCBc
120 SMGB0120 rev.0 - 11/2017
Transmission abnormality (Miswiring)
The connection of
transmission wiring is
correct
Yes
Check PCBc (CPU PCB)
Cold water suspension (Option)
No
range
Yes
No
conductivity?
Yes
No
correct
Yes
(CPU PCB)
No
Connect transmission wiring
correctly
Check the pump
Check the pump flow
Clogging of water
Check the water outage
protection switch
Check of wiring
strainer