Trouble Shooting - Midea MPM1-10CEN1-BB6 Technical & Service Manual

11

Trouble shooting

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