Outdoor Unit Fault - Fujitsu Waterstage Comfort Series Maintenance Document

Split system single phase type
Faults external to the heat pump
Any safety device (e g thermostat pressure switch) wired to input Ex3 (E20) allows external problems to be reported
and the heat pump to be immediately stopped. For example, a safety thermostat on the heating floor can be wired
to input Ex3 (E20) to avoid excessively high temperatures in the floor.
Power shedding or EJP
Tariffs, peak times/off-peak times,
External component
contact*
(faults, load
shedder, power meter)
* If the control device does not provide a potential-free contact,
* If the control device does not provide a potential-free contact,
the contact must be relayed to create equivalent wiring
the contact must be relayed to create equivalent wiring
In all cases, please refer to the instruction manuals for the external
In all cases, please refer to the instruction manuals for the external
components (load shedder, power meters) to create the wiring
components (load shedder, power meters) to create the wiring
** Option
** Option
The connection of terminal 3 of the remote control is not mandatory
T75 : The connection of terminal 3 of the room control unit T75 is
(lighting of the remote control)
not mandatory (lighting of the room control unit
2 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
Faults are coded by LED located on the hydraulic unit interface board (see
Maintenance document "1792 - EN"
(peak day removal)
day / night
External fault
L
figure 2 - Typical Wiring of External Devices
EX1
X11
EX2
EX3
X86 X84
1 M B9
5 6 4 5 6 4 5 6
2 1 3 2 1 3 2
or or
** Room
thermostat
** Room ** Room control
T55
control unit unit radio
T75 T78
figure 1)
Outdoor
sensor
1
or
** Room
thermostat
radio T58
- 7 -