Midea MV6-R252WV2RN1 - Fault Symptom: Non Air Conditioning Issues

07
7.2 Fault Symptom: Non Air
Conditioning Issues
The following fault symptoms are not caused by the air
conditioning:
7.2.1 Fault symptom: System cannot run
Air conditioner does not start immediately after pressing
the switch button on the controller. If the operating
indicator lights up, the system is working normally. In
order to prevent overloading of the compressor motor,
restart the air conditioner 12 minutes after the switch
button is pressed to prevent it from shutting down
immediately after it is on. The same start-up delay
occurs after the mode selector is pressed.
7.2.2 Fault symptom: Fan speed is not
consistent with the setting
Even if the fan speed regulation button is pressed,
the fan speed does not change. During heating, when
the indoor temperature reaches the set temperature,
the outdoor unit will shut down, and the indoor unit
switches to the quiet fan speed mode. This is to prevent
cold air from blowing directly at the room user. The fan
speed will not change even when another indoor unit is
in heating operation, if the button is pressed.
7.2.3 Fault symptom: Fan direction is not
consistent with the setting
The air direction is not consistent with the user
interface display. The air direction does not swing.
This is because the unit is controlled by the centralized
controller.
7.2.4 Fault symptom: White smoke from
a certain unit (indoor unit)
During cooling when the humidity is high. If the
interior pollution of the indoor unit is severe, the
indoor temperature distribution will be uneven. Need
to clean the interior of the indoor unit. Ask the agent
for detailed information on how to clean the unit. This
operation must be carried out by qualied maintenance
personnel.
Surface immediately after cooling has stopped and
when the indoor humidity is relatively low. This is due to
the steam produced by the warm refrigerant gas on its
return path to the indoor unit.
7.2.5 Fault symptom: White smoke from
a certain unit (indoor unit, outdoor
unit)
After the defrosting operation, switch the system to the
heating mode. The moisture produced by the defrosting
operation will become steam to be discharged out of
the system.
7.2.6 Fault symptom: Noise from air
conditioner (indoor unit)
A "zeen" sound is heard the moment the system is
powered on. This noise is produced by the electronic
expansion valves inside the indoor unit as they begin
to work. The sound volume will be reduced in about 1
minute.
A soft and continuous "shah" sound can be heard
when the system is in a cooling mode or has stopped
running. This noise can be heard when the drainage
pump is running (optional accessory).
A loud creaking "pishi-pishi" sound can be heard once
the system stops after it has heated up the room. The
expansion and contraction of plastic parts caused by
temperature changes will also make this noise.
Once the indoor unit stops, a soft "sah" or "choro-choro"
sound can be heard. This noise can be heard when
another indoor unit is still running. Must maintain a small
amount of refrigerant ow in order to prevent oil and
refrigerant residues in the system.
7.2.7 Fault symptom: Noise from air
conditioner (indoor unit, outdoor
unit)
A soft, continuous hissing sound can be heard when the
system is in cooling or defrosting operation. This is the
sound of the refrigerant gas owing in the indoor and
outdoor units.
A hissing sound is heard the moment the system starts
or stops operation or after the defrosting operation has
been completed. This is the noise produced when the
refrigerant ow is stopped or changed.
7.2.8 Fault symptom: Noise from air
conditioner (outdoor unit)
When the tone of the operating noise changes. This
noise is caused by frequency changes.
7.2.9 Fault symptom: Dust and dirt in the
unit
When using the unit for the rst time. This is because
there is dust inside the unit.
7.2.10 Fault symptom: Strange odour from
unit
This unit will absorb the odours of rooms, furniture,
cigarettes and others, and then disperse the odours
again.
Small animals stray into the unit, which can also cause
odors.
7.2.11 Fault symptom: ODU fan does not
run
In the course of operation. Control speed of fan motor to
optimize the product operations.
7.2.12 Fault symptom: Hot air is felt when
the indoor unit stops
IDifferent types of indoor units operating in the same
system. When another unit is running, part of the
refrigerant will still ow through this unit.