Midea MPM1-10CEN1-BB6, Technical & Service Manual

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Trouble shooting
27
11 Trouble shooting
PROBLEM POSSIBLE CAUSE REMEDY
No power display
on panel or any
one of the buttons
failure.
Power failure
Check the power supplier if the power supplier is supplied
to the unit. Check the power cord and correct if damaged.
Transformer (Discharge
transformer before
testing) Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the
input/output is open or the transformer is damaged.
Display board or main
PCB failure Check the voltage on display board. Replace the display
board if it is +5V else replace the main PCB.
Remote control
failure.
Battery failure
Check the voltage of battery. Replace batteries if the
voltage is lower than 2.3V.
Fan motor runs
intermittently
Cycles on overload.
Check voltage. Call an electrician if not within limits.
Test capacitor.
Replace if not /-10% of manufacture's rating.
Check bearings. Replace the motor if the blower wheel
cannot rotate freely.
Pay attention to any change from high speed to low speed.
Replace the motor if the speed does not change.
Compressor
stops instantly
after startup. Refrigerant
The amount of the refrigerant is too much, making the
compressor load too big. Recycle and recharge the
refrigerant after checking for the reason.
Compressor
The compressor is blocked inside. Replace after checking
for the reason.
Fan motor will not
run.
No power Check voltage at electrical outlet. Correct if none.
Water alarm Check and correct if water alarm happens.
Power supply cord
Check voltage at the power cord terminal on Main PCB.
Replace the power cord if none.
Transformer (Discharge
transformer before
testing) Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the
input/output is open or the transformer is damaged.
Wire disconnected or
connection loose Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Main PCB failure
Select fan speed and Check the voltage on main PCB.
Replace the main PCB if no voltage in anyone.
Capacitor (Discharge
capacitor before testing)
Test capacitor.
Replace if not /-10% of manufacture's rating.
Replace if shorted, open or damaged.
Will not rotate
Fan blower hitting scroll. Realign assembly.
Check fan motor bearings. Replace the motor if motor shaft
do not rotate.
Fan motor noise. Fan blower
Replace the fan blower if cracked, out of balance, or
partially missing.