Fujitsu WATERSTAGE 112 Maintenance Document page 28

Heat Pump, Split System, Single Service, 3 phase
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.
28
OK
OK
Maintenance Document 1394-1