Fujitsu Waterstage WS G140DC6 Series Maintenance Document page 11

Split system (Single phase and 3-phase type)
Clear 4: Heat pump capacity signal error
Hydraulic Unit LED: Green 4 flashes / Red 1 flash
Outdoor Unit LED: 22 flashes
Probable causes:

Misconnection.

Sensor failure.

Interface PCB failure.
Check:
1. Check connection interface PCB and Heat pump regulator PCB:
See if the connector has been disconnected.
-
See if the connection is correct.
-
Check for any damage on the sensor cable.
-
After solving the misconnection problem, switch the heat pump back on.
2. Check resistance value:
3 pin of CN22 – M < 10Ω
3. Replace interface PCB:
If check point 1 and 2 do not improve the symptom, replace Interface PCB.
Maintenance Document 1544-1
OK
OK
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