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CU-4E23QBR
CU-4E27QBR 5E34QBR
15.1.2 Test Run Operation
Test operation can be carried out using TEST OPERATION button (SW2) on the Service PCB inside the outdoor
unit.
For Cooling test, press the TEST OPERATION button (SW2) for 5 seconds or more but less than 10 seconds,
LED1 and LED 2 will illuminate when shift into cooling test operation.
For Heating test, press the TEST OPERATION button (SW2) for more than 10 seconds, LED 1 and LED 3 will
illuminate when shift into heating test operation.
Press the TEST OPERATION button (SW2) again to cancel test operation.
15.1.3 Wiring Error Check
This product capable to correct the wiring error automatically by following procedures.
1. Confirm the valve on the liquid side and gas side is open.
2. Press WIRING CHECK switch (SW3) on the display printed circuit board for more than 10 seconds to start
wiring check operation.
3. Wiring check process will complete in approximately 20-25 minutes. However, wiring check operation will not
start within 3 minutes after compressor is stopped. When outdoor air temperature is less than 5°C or unit has
4. abnormality, wiring check will not start. (See NOTE 2)
The LED 2 to 6 in display printed circuit board inside the outdoor unit indicate whether correction is possible or not
and the status of the correction, as shown in the table below.
CU-4E23QBR
LED 2 3 4 5 6 Message
Room A B C D -
All flashing Automatic correction impossible
LED2, 4, 6 and LED 3, 5
alternatively flashing
Wiring check in progress
Flashing one after
another
Automatic correction completed
Status
Other than above Unit has abnormality (Note 4)
If automatic correct is impossible, check the
indoor unit wiring and piping manually.
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