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Switch on all the 4 dip-switches on the outdoor unit small service PC-board as shown on the
right. Then poweroff the unit and power on again, the system will enter the operation of "Wiring
Error Check". After 3 minutes
stand-by, the unit starts for automatic wiring checking.
Approximately 30 - 50minutes (depends on how many units installed in the system) after the unit
starts, the Errors of the wiring will be shown by the LEDs (1 to 3).
During this operation, the digital-number will alternately show the compressor working frequency (e.g. 50 stands
for the current running frequency) and letter "CH"(means checking).
After this operation, if all the wiring is correct, the digital-number will show "0", if there has wrong wiring, the digital-
number will show "EC"(error connection) and also it will ashing.
The service monitor LEDs indicate the error of wiring, as shown in the table below. For details about how to read
the LED display, refer to the service manual.
If self-checking is not possible, check the indoor unit wiring and piping in the usual manner.
LED 1 2 3 4 5 Message
Status
OFF Unit not connected
ALL Flashing
Automatic checking impossible,
all units connect wrong
ALL ON All units connect correctly
ON FLASHING FLASHING ON FLASHING
ON: unit connect correctly
FLASHING: unit connect wrong,
need to change the wiring
manually between 2, 3, and 5
ON FLASHING FLASHING ON ON
ON: unit connect correctly
FLASHING: unit connect wrong,
need to change the wiring
manually between 2, 3
Only one LED ashing Abnormal
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