Fujitsu WATERSTAGE WOYG160LJL Maintenance Document page 25

Clear 21: Active fi lter error (only for single phase type)
Hydraulic Unit LED:
Outdoor Unit LED:
Probable causes:
• Connection failure.
• Active fi lter module failure.
• Main PCB failure.
Check:
Waterstage / Maintenance Manual / 2105 - EN
Green 6 fl ashes / Red 4 fl ashes
19 fl ashes
1. Check connections in control unit:
- Check if the terminal connection is loose.
- Check if connector is removed.
- Check if connector is erroneous connection.
- Check if cable is open.
Upon correcting the removed connector or mis-wiring, reset
the power.
2. Replace Active Filter Module and Main PCB :
If Check Point 1 does not improve the symptom, replace
Main PCB and Active Filter Module and execute the
checkoperation again.
OK
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