Fujitsu WATERSTAGE 112 Maintenance Document page 41

Heat Pump, Split System, Single Service, 3 phase
Clear 20: Inverter error
Hydraulic Unit LED: Green 6 flashes / Red 3 flashes
Outdoor Unit LED: 18 flashes
Probable causes:
•
Connection failure.
•
Main PCB failure.
•
Inverter 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 Main PCB and Inverter PCB:
If Check Point 1 do not improve the symptom, replace Main
PCB and Inverter PCB.
Maintenance Document 1394-1
OK
41