Fault Diagnosis; Faults In The Hydraulic Unit - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

Fault Diagnosis

Depending on whether the fault comes from the outdoor unit or the hydraulic unit, the fault may be indicated by the
digital display or the LED on the interface cards.
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Faults in the Hydraulic Unit

Faults or breakdowns on the hydraulic unit are indicated by the display on the user interface.
The display shows the
Press the key for more details on the origin of the fault.
When the error has been resolved, the faults are re-initialised at zero automatically.
■ Hydraulic unit: Fault visible on the digital display.
Error Designation
10 Outside sensor
32 Flow sensor 2
33 Flow sensor HP
44 Return sensor HP
50 DHW sensor 1
60 Room sensor 1
65 Room sensor 2
83 BSB, short circuit
127 Legionella temp
212 Internal comm failure
369 External
370 Thermodynamic source
441 BX31 (Temperature sensor 2)
442 BX32 no function
443 BX33 no function
BX34 (Swimming pool return
444
temperature)
516 Heat pump missing
Before performing any maintenance, make sure that all power supplies have been
cut off .
Stored energy: after cutting off the power supplies,
wait for 10 minutes before accessing the internal parts of the equipment.
Frost protection is not available when the heat pump is not powered up.
- 66 -
symbol.
Probable causes
Short-circuit.
Unplugged or disconnected sensor.
Faulty sensor.
Other fault.
Wiring problem (between the sensor or
remote control, display and controller).
Anti-legionella temp setpoint not
reached.
Unplugged or disconnected sensor.
External safety triggered EX3
(fi g. 45, page
See details
Short-circuit.
Unplugged or disconnected sensor.
Faulty sensor.
Other fault.
Loss of connection between controller
and HP.
39).
page 67.
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
Proposed actions
Check the sensor's wiring.
Replace the sensor.
Check the wiring.
Check the wiring of the DHW
backup / boiler connection.
Check the sensor's wiring.
-
-
Check the sensor's wiring.
Replace the sensor.
Check the wiring between X60 and the
interface board (fi g. 58, page 78).