Midea MFA-18HRDN1-Q Manual page 17

Table 9-1
NO. running lamp
1
2
×
3
×
4
×
5
(× Extinguish Flash at 5Hz,
Table 9-2
Symptoms
Unit does not start
Air flowing normally but
completely can't cooling
Units start or stop frequently
Low cooling effect
Low heating effect
timer lamp defrosting lamp
× ×
×
×
×
Flash at 0.5Hz
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.
Be in 3 minutes protection of
compressor.
Refrigerant is too little or too much.
Air or no concretingc gas in the refriger-
ating circuit.
Compressor is malfunction.
Voltage is too high or too low.
System circuit is blocked.
Outdoor unit and indoor unit heat exch-
anger is dirty.
The air filter is dirty.
Inlet/outlet of indoor/outdoor units is blo-
cked.
Doors and windows are open
Sunlight directly shine.
Too much heat resource.
Outdoor temp. is too high.
Leakage of refrigerant or lack of refrige-
rant.
Outdoor temperature is lower than 7 C
Doors and windows not completely
closed.
Leakage of refrigerant or lack of
refrigerant.
Malfunction for unuit of 12000Btu/h Malfunction for unuit of 18000Btu/h
Room temperature sensor
checking channel is abnormal
Evaporator sensor checking
channel is abnormal
Condenser sensor checking
channel is abnormal
Room Circuit malfunction
Wait for the comeback of power.
Switch on the power.
ReplLocation:
Replace the batterises or check the con-
troller.
Set the temperature properly.
Wait.
Check leakage, and rightly recharge ref-
rigerant.
Vacuum and recharge refrigerant.
Maintenance or change compressor.
Install manostat.
Find reasons and solution.
Clean the heat exchanger.
Clean the air filter.
Eliminate all dirties and make air smooth.
Close doors and windows.
Make curtains in order to shelter from
sunshine.
Reduce heat source.
AC cooling capacity reduces (normal).
Check leakage and rightly recharge
refrigerant.
Use heating device.
Close doors and windows.
Check leakage and rightly recharge
refrigerant.
Room temperature sensor
checking channel is abnormal
Mode impact
Room Circuit malfunction
Outdoor unit malfunction
Solution
installation & owner's manual
15