Haier 1U71S2SG1FA Service Manual page 196

Test Running
• Before Starting the Test Running, Please Confirm the Following Works Have been Done Successfully.
1) Correct piping work
2) Correct wiring work
3) Correct match of indoor and outdoor unit
4) Proper recharge of refrigerant if needed.
• Make sure that all the stop valves are fully open.
• Check the voltage supplied to the outdoor and indoor units, please confirm that is 220-240v.
• Wiring error check
This product is capable of automatic checking of wiring error.
Switch on all the 4 dip-switches on the outdoor unit small service PC-board as shown on the right.
Then power off 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 flashing.
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
Status
ON FLASHING FLASHING
ON FLASHING FLASHING
Only One LED Flashing
• Test running.
1) To test cooling, set the lowest temperature at 16°C. To test heating, set the highest temperature, at 30°C.
If the temperature is lower than 16°C, it is impossible to test cooling with remote controller, and also when the
temperature is higher than 30°C, it is impossible to test heating.
2) Please check both cooling and heating operation of each unit individually and then also check the simultaneous
operation of all indoor units.
3) After running the unit for about 20 minutes, check the indoor unit outlet temperature.
4) After the unit is stopped, or working mode changed, the system will not start again for about 3 minutes.
5) During cooling operation, frost may occur on the indoor unit or pipes, this is normal.
6) Operate the unit according to the operation manual. Please kindly explain to our customers how to operate
through the instruction manual.
• Seven-segment Numeric Display
1) When unit is running, this seven-segment numeric will display the frequency of compressor. For
example, " " means compressor running frequency is 40 Hz, "
frequency is 108Hz.
2) When faulty happens, seven-segment numeric will flash and display some numbers, this number
is failure code. For example, a flashing "
communication error.
3 4
OFF
ALL Flashing
ALL ON
ON FLASHING
ON
" means No.15 failure, that is indoor and outdoor
193
5
Unit Not Connected
Automatic Checking Impossible, All Units
Connect Wrong
All Units Connect Correctly
On: Unit Connect Correctly
Flashing: Unit Connect Wrong, Need To
Change The Wiring Manually Between 2,3, And
5
On: Unit Connect Correctly
ON Flashing: Unit Connect Wrong, Need To
Change The Wiring Manually Between 2,3
Abnormal
" means compressor running
Message