12 | Commissioning
Installer reference guide
64
2MXM68+3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
4P600463-1C – 2020.08
12.5.1 About wiring error check
The wiring error check function will check and automatically correct any wiring
errors. This is useful for checking wiring that CANNOT be checked directly, such as
underground wiring.
This function CANNOT be used within 3minutes after activating the safety breaker
or when the outside air temperature is ≤5°C.
To perform a wiring error check
INFORMATION
▪ You only have to perform a wiring error check if you are not sure that the
electrical wiring and piping is connected correctly.
▪ If you perform a wiring error check, the hybrid for multi indoor unit will not
operate by heat pump for 72hours. During this time, the gas boiler will take over
the hybrid operation.
1 Remove the service PCB switch cover.
2 Press the wiring error check switch (SW3) on the outdoor unit service PCB.
Result: The service monitor LEDs indicate whether correction is possible or
not. For details about how to read the LED display, refer to the service
manual.
Result: Wiring errors will be corrected after 15-20minutes. If automatic correction
is not possible, check the indoor unit wiring and piping in the usual way.
INFORMATION
▪ The number of LEDs displayed depends on the number of rooms.
▪ The wiring error check function will NOT work if outside temperature is ≤5°C.
▪ After wiring error check operation is completed, LED indication will continue until
normal operation starts.
▪ Follow the product diagnosis procedures. For details of product error diagnosis
refer to service manual.
Status of LEDs:
▪ All LEDs flash: automatic correction is NOT possible.
▪ LEDs flash alternately: automatic correction is completed.
▪ One or more LEDs are permanently on: abnormal stop (follow the diagnosis
procedure on the back of the right side plate and refer to service manual).
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