Troubleshooting - Midea MWHUK-05CMN8-BCK0 Service Manual

7 Troubleshooting

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In general, possible trouble is classified in three kinds. One is called Starting Failure which is caused from an
electrical defect, another is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper
application, and the other is called the Structure Damage.
7.1 Troubleshooting
Problem
Air conditioner does not start
Air from unit does not feel cold enough
Air conditioner cooling, but room is too
warm- ice forming on cooling coil behind
decorative front.
Air conditioner cooling, but room is too
warm- NO ice forming on cooling coil
behind decorative front.
Air conditioner turns on and off rapidly
Noise when unit is cooling
Water dripping INSIDE when unit is
cooling.
Water dripping OUTSIDE when unit is
cooling.
Remote Sensing Deactivating
Prematurely (some models)
Room too cold
Solution
Wall plug disconnected. Push plug firmly into wall outlet.
House fuse blown or circuit breaker tripped. Replace fuse with time delay type or reset circuit breaker.
Plug Current Device Tripped. Press the RESET button.
Power is OFF. Turn power ON.
Room temperature below 17 ℃(62℉). Cooling may not occur until room temperature rises above 17 ℃(62℉).
Temperature sensing behind air filter element touching cold coil. Keep it from the cold coil.
Set to a Lower temperature.
Compressor stopped when changing modes. Wait for 3 minutes after set to the COOL mode.
Outdoor temperature below 17 ℃(62℉). To defrost the coil, set FAN ONLY mode.
Air filter may be dirty. Clean filter. Refer to Care and Cleaning section. To defrost, set to FAN ONLY mode.
Thermostat set too cold for night-time cooling. To defrost the coil, set to FAN ONLY mode. Then, set temperature
to a Higher setting.
Dirty air filter- air restricted. Clean air filter. Refer to Care and Cleaning section.
Temperature is set too High, set temperature to a lower setting.
Air directional louvers positioned improperly. Position louvers for better air distribution.
Front of units is blocked by drapes, blinds, furniture, etc. - restricts air distribution. Clear blockage in front of unit.
An open doors, windows, or register may allow cold air to escape. Close any doors, windows or registers.
The room may be too warm. Allow additional time to remove "Stored heat" from walls, ceiling, floor and furniture.
Dirty air filter- air restricted. Clean air filter
Outside temperature extremely hot. Set FAN speed to a Higher setting to bring air past cooling coils more
frequently.
Air movement sound. This is normal. If too loud, set to a slower FAN setting.
Window vibration - poor installation. Refer to installation instructions or check with installer.
Improper installation. Tilt air conditioner slightly to the outside to allow water drainage. Refer to installation
instructions - check with installer.
Unit removing large quantity of moisture from humid room. This is normal during excessively humid days.
Remote control not located within range. Place remote control within 20 feet and pointed in the general direction of
the air conditioner unit.
Remote control signal obstructed. Remove obstruction.
Set temperature too low. Increase set temperature.
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