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FAULT CHECKUP
Please check the following before consulting repair service:
Symptoms
Running water noise
Cracking sound
Bad smell in outlet air
All of these are
Flashing operating indicator
not problems.
Waiting indicator
Idle indoor unit still has sound
of refrigerant flowing and
radiating temperatures
Clicking sound when unit
comes on
Start or Stop working
automatically
Failure to work
Please make
another check.
Check if there is
a power failure.
Poor cooling & heating
effects
Immediately stop system operation, disconnect the system power supply switch and contact the after-service personnel
if the following circumstances exist:
• When buttons are not flexible and actuated;
• When there are foreign objects or ice in the unit;
• When the system will not operate after exiting the protection mode;
• When other abnormal conditions occur.
31-5000553 Rev. 1
Reasons
Water running sound can be heard during starting operation, during operation or immediately
after stopping. The running water sound may become louder 2-3 minutes after the unit starts.
The sound is refrigerant circulating inside the system.
During operation, the air conditioner may make a crackling sound. This is caused from the temperature
changes of the heat exchanger.
Clean filters and confirm the condensate drain pan and drain line are clean and clear.
When restoring power after power failure will show the operating indicator flashes.
Waiting indication is displayed if the unit fails to perform cooling operation while other indoor
units are in heating mode. When the control is set it to the opposite mode as the system is
currently operating; the control displays waiting.
While other indoor units are operating; some refrigerant flow is allowed to pass through other idle units.
This may result in some radiating temperature and flow noise.
The sound is made when the system is powered on and is from a metering valve calibrating. This
sound is normal.
Check to see if the system operation is being controlled by the timer function.
Timer - ON and Timer - OFF
Check if there is a power failure.
Check if the power supply fuse or breaker are open.
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
Check if outdoor fan intake or outlet grilles are blocked.
Check if doors and windows are open.
Check if the air filter is blocked with debris or dust.
Check if the fan setting is too low.
Check if the system mode is set to Fan mode.
Check if the temperature is set correctly.
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