MCAC-UTSM-201707 Midea R410A T3 50Hz Top-discharge Series
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11. Trouble shooting
11.1 Phenomena not attributable to faults of air conditioner
The following phenomena do not indicate exception of air conditioner.
The system does not run.
After pressing the ON/OFF button, the system does not run immediately.
If the Run indicator is on, it indicates the air conditioner runs in the normal status.
It does not run immediately because the safety device in the system is active to prevent
overload.
Three minutes later, the air conditioner compressor will run automatically.
If the Run indicator and the Defrost/Preheat indicator are on, it indicates you have
selected the heating mode. At the beginning after startup, since the compressor does
not run, the temperature of the indoor unit is too low. See the chapter
“Cooling/Heating/Supply Air Operation Procedure".
The indoor unit gives out white aerosol.
This phenomenon may occur when the indoor relative humidity is too high and the unit
runs in the cooling mode (in a place where there is much oil mist or dust).
If the internal stain of the indoor unit is heavy, the temperature in the room will be
distributed unevenly. In this case, the interior of the indoor unit must be cleaned.
Contact the local distributor or the aftersales service center of manufacturer to inquire
about the methods of cleaning the indoor unit. This job must be performed by
professional maintainers.
This phenomenon may also occur when the air conditioner shifts from defrosting
operation to heating operation. That is because the moist generated by defrosting is
expelled as steam.
Noise of air conditioner
When the air conditioner runs in the cooling, dry or heating mode automatically, grave
continuous sizzles may occur. That is the sounds of refrigerant flowing between the
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