Fujitsu Waterstage WS G140DC6 Series Maintenance Document page 24

Split system (Single phase and 3-phase type)
Clear 21: active filter error (only for single phase type)
Hydraulic Unit LED: Green 6 flashes / Red 4 flashes
Outdoor Unit LED: 19 flashes
Probable causes:
Connection failure.


Active filter module failure.
Main PCB failure.

Check:
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.
24
OK
Maintenance Document 1544-1