Fujitsu Waterstage WS G140DC6 Series Maintenance Document page 22

Split system (Single phase and 3-phase type)
Clear 18: Fan motor error (permanent stoppage)
Hydraulic Unit LED: Green 9 flashes / Red 7 flashes
Outdoor Unit LED: 16 flashes (fan 1), 17 flashes (fan 2)
Probable causes:

Fan motor failure.

Motor protection.

Main PCB failure.
Check:
1. Check fan rotation:
- Switch off the heat pump and rotate the fan manually.
- If the fan or bearings are faulty, replace them.
2. Check the ambient temperature around the motor:
- Check excessively high temperature around the fan.
Wait until the temperature comes down again and switch the
fan back on.
3. Check the main board output voltage:
- On the outdoor unit, check the output voltage (DC) of the following connectors:
If the voltage is incorrect, replace Main PCB.
22
OK
OK
Terminals
1 (red)/ 3 (black) 300
4 (white)/3 (black)
CN802 CN803
Voltage
390V
15 ±2V
Maintenance Document 1544-1