376
Troubleshooting
Alarm code
78
Hydraulic ow rate abnormality alarm (WP1)
● Alarm code is displayed on the master controller/ the 7-segment of O.U. display PCB / the 7-segment of I.U. PCB1.
● This alarm is displayed when there is a low ow rate abnormality in the hydraulic system as following and the same
condition occurs three times or more within 60 minutes.
Note:The detection is invalid when DSW5-1 ON.
● Reset the unit to release the alarm.
No
Yes
Is WP1 running when
the unit is operating?
Are the all water circuit
valves completely open?
Refer to Alarm 75
procedures
No
Open water circuit valves
Are the water
No
Yes
Check water pressure
value to make sure water
pressure is enough
Charge water
Perform air purge
Check to make sure there is
> 1 bar
Is there any air trapped
inside the water circuit
Faulty I.U. PCB1
(Check I.U. PCB1).
Yes
≤ 1 bar
Check operation condition
by entering into checking
mode to check Pw
Check Water Pump1 feedback in “Alarm Code 75”.
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