Midea MKG Series Technical & Service Manual page 33

AC Fan Coil Unit Two-pipe Wall-mounted Series
12.8 Troubles and causes of air conditioner
If one of the following malfunctions occur, stop operation, shut off the power, and contact with your dealer.
• The operation lamp is flashing rapidly (twice every second)
• This lamp is still flashing rapidly after turn off the power and turn on again.
• Remote controller receives malfunction or the button does not work well.
• A safety device such as a fuse, a breaker frequently actuates.
• Water leaks from indoor unit.
• Other malfunctions.
Symptoms
Unit does not start
Air flowing normally but
completely can't cooling
Low cooling effect
Low heating effect
12.9 Troubles and causes of remote controller
Before asking for serving or repairing, check the following points.
Symptoms
The fan speed cannot be changed.
The remote controller signal is not
transmitted even when the ON/OFF
button is pushed.
The TEMP. indicator does not come on.
The indication on the display disappears
after a lapse of time.
The TIMER ON indicator goes off after a
lapse of certain time.
No receiving tone sounds from the indoor
unit even when the ON/OFF button is
pressed.
Causes
• Power failure;
• Power switch is off;
• Fuse of power switch may have burned;
• Batteries of remote controller exhausted or other
problem of controller.
• Temperature is not set correctly.
• Indoor unit heat exchanger is dirty;
• The air filter is dirty;
• Inlet of indoor unit is blocked;
• Doors and windows are open;
• Sunlight shine directly;
• Too many heat resourc es;
• Outdoor temperature is too high.
• Outdoor temperature is lower than 7℃;
• Doors and windows are not completely closed.
• Check whether the MODE indicated on the
display is "AUTO".
• Protection against hot wind in cooling mode.
• Protection against cold wind in heating mode.
• Check whether the batteries in the remote
controller are exhausted.
• Check whether the MODE indicated on the
display is "FAN ONLY".
• Check whether the timer operation has come to
an end when the "TIMER OFF" is indicated on
the dis play.
• Check whether the timer operation is started
when the "TIME ON" is indicated on the display.
• Check whether the signal transmitter of the
remote controller is properly directed to the
infrared signal receiver of the indoor unit when
the ON/OFF butt on is pressed.
• Wait for the comeback of power;
• Switch on the power;
• Replace the fuse;
• Replace the batteries or check the controller.
• Set the temperature properly.
• Clean the heat exchanger;
• Clean the air filter;
• Eliminate all dirties and make air smooth;
• Close doors and windows;
• Make curtains in order to s helter from sunshine;
• Reduce heat resource;
• AC cooling capacity reduces (normal).
• Use heating device;
• Close doors and windows.
Causes
- 32 -
Solution
Solution
When the automatic mode is selected, the air
conditioner will automatically change the fan
speed.
Reduce the temperature of inlet in cooling
mode rise the temperature of inlet in heating
mode.
The power supply is off.
The temperature cannot be set during FAN
mode.
The air conditioner operation will stop up to the
set time.
Up to the set time, the air conditioner will
automatically start and the appropriate indicator
will go off.
Directly transmit the signal transmitter of the
remote controller to the infrared signal receiver
of the indoor unit, and then repeat pus hing the
ON/OFF button twice.