Fujitsu WATERSTAGE 112 - Outdoor Unit Fault

Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 25
4.1.2 Outdoor Unit Fault
When the system is switched back on after a power
outage, the Hydraulic Unit may display fault 370 for a
few tens of seconds. This is not a serious problem. It
simply means that the outdoor unit is running its
tests. Once the tests have been completed, the fault
should disappear.
If it doesn't, if a fault has occurred on the outdoor unit
as indicated by the Hydraulic Unit, you must remove
the front (right-hand) facing from the outdoor unit.
Faults are coded by LED flashes. Error messages are
listed in the table below:
On the outdoor unit
When an error occurs:
- The diode “ERROR” (2) blinks
Press once on the switch “ENTER” (SW4)
- The “ERROR” (2) diode blinks several times depending on the error’s type
Location of switches and diodes on outdoor unit
LED display on the outdoor unit
LED display
Hydraulic Unit
Diagnosis Clear
Green Red
Outdoor unit
Off Serial reverse transfer error. 1
1 flash 1 flash
1 flash Serial forward transfer error. 2
4 flashes 1 flash 22 flashes Heat pump capacity signal error 4
4 flashes 2 flashes 22 flashes Hydraulic Unit Heat ex. Sensor error 5
6 flashes 3 flashes 18 flashes Inverter error. 20
6 flashes 4 flashes 19 flashes P.F.C. error. 27
7 flashes 1 flash 2 flashes Discharge thermistor error. 7
7 flashes 2 flashes 8 flashes Compressor thermistor error. 11
5 flashes Heat-exchange thermistor (intermediate) error. 12
7 flashes 3 flashes
4 flashes Heat-exchange thermistor (outlet) error. 8
7 flashes 4 flashes 7 flashes Outdoor temperature thermistor error. 9
9 flashes Heat sink thermistor (inverter) error. 10
7 flashes 7 flashes
10 flashes Heat sink thermistor (P.F.C.) error. 13
7 flashes 8 flashes 6 flashes Expansion valve thermistor error. 14
8 flashes 6 flashes 3 flashes Pressure sensor error. 24
9 flashes 4 flashes 13 flashes Current trip (permanent stoppage). 15
14 flashes Detection of compressor position error (permanent stoppage). 33
9 flashes 5 flashes
15 flashes Compressor start up error (permanent stoppage). 17
16 flashes Outdoor unit fan 1 motor error.
9 flashes 7 flashes
17 flashes Outdoor unit fan 2 motor error.
18
10 flashes 1 flash 11 flashes Discharge temperature protection (permanent stoppage). 22
10 flashes 3 flashes 12 flashes Compressor temperature protection (permanent stoppage). 25
10 flashes 5 flashes 20 flashes Low pressure abnormal. 26