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31-5000500 Rev. 0 9
ENGLISH
Installation Requirements Checklist
Please check the following before contacting a repair service:
Under the following circumstances, immediately stop the operation, disconnect the manual supply switch and contact
the after-service personnel.
• When control buttons are inoperable
• When circuit breakers trip repeatedly
• When the outdoor unit is blocked with ice or foreign objects.
• When the system fails to restart after power reset.
• When system operates abnormally.
FAULT CHECK
All these are not problems
Symptoms Reasons
Running water noise sound Running water sound can be heard during starting operation, during operation
or immediately after stopping operation. When it starts for 2-3 minutes, the
sound may become louder, which is the flowing sound of refrigerant or the
draining sound of condensate water.
Tapping sound During operation, the air conditioner may make a tapping sound, which is
caused from the temperature changes of the heat exchanger.
Bad smell in outlet air Clean filters and confirm the condensate drain pan and line are clean and
clear.
Operating indicator flashing When switching it on again after power failure, turning on the manual power
switch will show the operating indicator flashes.
Waiting Indicator Displayed when the control is set it to the cooing or heating mode and the
current mode of operation is opposite to the requested setting.
Idle indoor unit still has sound of refrigerant
flowing and radiating
temperatures.
Some refrigerant flow is allowed to pass through idle indoor units to prevent oil
and refrigerant from blocking the metering valve. This flow may result in some
radiating temperature and noise.
Clicking sound when unit comes on. The sound is made due to the expansion valve resetting when the unit is
powered on.
Start or stop working automatically Check if it is set to Timer-ON and Timer-OFF.
Please make another check.
Failure to work Check if there is a power failure.
Check if the supply fuse and breaker are disconnected.
Check if the unit is displaying any faults.
Check if wait symbol is displayed. This is due to other indoor units connected
to the same outdoor unit are running in the opposite mode.
System cannot heat and cool simultaneously.
Poor cooling & heating effects Be sure outdoor unit fan inlet and outlets are not blocked.
Check to be sure doors and windows are closed.
Check for dirty or blocked air filter.
Make sure the fan speed is not too low.
Check if the mode set to Fan mode.
Be sure the temperature control is set only correctly.
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