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The system maintenance must be carried out by a qualied maintenance personnel:
Error Measures
If a safety device, such as a fuse, circuit breaker or a leakage
circuit breaker is triggered frequently or the ON/OFF switch is
not working properly.
Turn off the main power switch.
The operating switch is not functioning normally. Turn off the power supply.
If the unit number is displayed on the user interface, and the
operating indicator is ickering, and an error code is shown on
the screen as well.
Notify the installation personnel and report the error code.
Other than the above-mentioned situations, and where the fault is not obvious, if the system continues to malfunction, carry
out the following steps to investigate.
Error Measures
If the system does not run at all.
Check if there is a power failure. Wait for the power supply
to be restored. If a power failure occurs when the unit is still
running, the system will restart automatically once the power
is restored.
Check if the fuse is broken or if the circuit breaker is working.
If necessary, replace the fuse or reset the circuit breaker.
If the system works ne in the fan-only operating mode but
stop running once it enters the heating or cooling operation
modes.
Check if the air inlets or outlets of the outdoor or indoor units
are blocked by any obstacles. Remove the obstacles, and
maintain good ventilation in the room.
The system is running but there is insufcient cooling or
heating.
Check if the air inlets or outlets of the outdoor or indoor units
are blocked by any obstacles.
Remove the obstacles, and maintain good ventilation in the
room.
Check if the lter is blocked (please refer to the "Maintenance"
section in the manual of the indoor unit).
Check the temperature settings.
Check the fan speed settings on the user interface.
Check if the doors and windows are open. Close the doors
and windows to shut out wind from the external environment.
Check if there are too many people in the room when the
cooling mode is in operation. Check if the heat source of the
room is too high.
Check if there is direct sunlight into the room. Use curtains or
blinds.
Check that the angle of air ow is appropriate.
7.1 Error Code: Overview
If an error code appears on the unit user, please contact the installation personnel and inform them of the error code, device
model, and serial number (you can nd the information on the nameplate of this unit).
Displayed
Content Error or protection denition Remarks
E0 Communication error between outdoor units Only displayed on the slave unit with
the error
E2 Communication error between MS box and master unit Only displayed on the the master unit
E4 T3/T4 temperature sensor error Displayed on the unit with the error
E5 Abnormal power supply voltage Displayed on the unit with the error
E7 Discharge temperature sensor error (T7C1) Displayed on the unit with the error
E8 Outdoor unit address error Displayed on the unit with the error
E9 EEPROM mismatch of compressor Displayed on the unit with the error
F1 DC bus voltage error Displayed on the unit with the error
F3 T6B temperature sensor error Displayed on the unit with the error
7


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