8 | Commissioning
Installer reference guide
68
RZAG71~140N
Sky Air Alpha-series
4P695307-1A – 2024.02
# Action Result
4 Press. The home menu is displayed.
5 Stop the test run.
# Action Result
1 Press at least 4seconds. The Service Settings menu is
displayed.
2 Select Test Operation.
Return Setting
Service Settings 1/3
Test Operation
Maintenance Contact
Field Settings
Demand
Min Setpoints Differential
Group Address
3 Press. The unit returns to normal
operation, and the home menu
is displayed.
8.5 Error codes when performing a test run
If the installation of the outdoor unit has NOT been done correctly, the following
error codes may be displayed on the user interface:
Error code Possible cause
Nothing displayed
(the currently set
temperature is not
displayed)
▪ The wiring is disconnected or there is a wiring
error (between power supply and outdoor unit,
between outdoor unit and indoor units, between
indoor unit and user interface).
▪ The fuse on the outdoor unit PCB has blown out.
E3, E4 or L8 ▪ The stop valves are closed.
▪ The air inlet or air outlet is blocked.
U1 or E7 There is a missing phase in case of three-phase
power supply units.
Note: Operation will be impossible. Turn OFF the
power, recheck the wiring, and switch two of the
three electrical wires.
L4 The air inlet or air outlet is blocked.
U0 The stop valves are closed.
U2 ▪ There is a voltage imbalance.
▪ There is a missing phase in case of three-phase
power supply units. Note: Operation will be
impossible. Turn OFF the power, recheck the
wiring, and switch two of the three electrical
wires.
U4 or UF The inter-unit branch wiring is not correct.
UA The outdoor and indoor unit are incompatible.
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