Midea US-KC25Y1/N1-N(H9) - Trouble Shooting; Compressor and Fan Motor Issues; Noise and Performance Issues

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intermittently
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.
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 within +/-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.
Loose screws
Tighten them.
Worn bearings
Replace the motor if knocking sounds continue when running
or loose, or the motor hums or noise appears to be internal
while running.
Compressor will
not run while fan
motor runs.
Voltage
Check voltage. Call Supply Authority if not within limits.
Wiring
Check the wire connections, if loose, repair or replace the
terminal. If wires are off, refer to wiring diagram for
identification, and replace. Check wire locations. If not per
wiring diagram, correct.
Main PCB failure
Check voltage of main PCB. Replace the main PCB if open.
Capacitor (Discharge
capacitor before testing)
Check the capacitor.
Replace if not within +/-10% of manufacturers rating. Replace
if shorted, open, or damaged.
Room temp sensor
Check the temperature setting if not at the coolest (in cooling
mode) or the warmest (in heating mode). Set it if not.
Compressor
Check the compressor for open circuit or ground. If open or
grounded, replace the compressor.
Excessive noise.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to
contact cabinet, compressor, shroud and barrier.
Water full alarm
Water depth is over load in
chassis(P1)
Use a drain hose and a pan to drain the condensed water in the
chassis.
Water depth sensor if
failure
Check and replace if failure.
shaded pole motor failure
Check and replace if the motor is failure.
Cooling or heating
feels not good
Air filter
Clean or replace if restricted.
Air discharge pipe
Realign and assemble if the installation of the air discharging
pipe failure. Replace if damaged.