Midea MSC-21CRN1, Service Manual

Page: 42 / 43

Service manual
38
PROBLEM CAUSE REMEDY
LED failure Replace the display if checked failure.
Remote control shut the
display
Push the button to turn the display on.
No power Check the voltage. Call an electrician if not within the limit.
Wiring Check the terminals. Repair and correct if loose.
Temperature setting Check and adjust the temperature setting.
Mode setting Check and adjust the mode setting.
Soft starter module failure
Check the module and the capacitor connected to the
module. Replace if failure.
Reverse valve solenoid
coil Check the reverse valve solenoid coil. Replace the coil if
short, open or damaged.
Reverse valve
If the reverse valve is blocked, the heating mode will not
perform. Replace the reverse valve after checking the
reason.
Water drainage failure Check the drainage pipe and repair if failure.
The indoor unit is incorrect
installed
Correct the installation if not correct.
Drainage pipe blocked Correct it.
The humidity in room is
too high
It's normal if the humidity in the room is over 85%.
Wiring failure Check wiring. Correct if wrong wiring or loosen.
Wire EMC
Check wiring. Correct if the commucication wire is not
shielded wire or twisted with other wires.
Zero-crossing
error
Outdoor PCB failure Replace if the LED is not on.
Outdoor transformer
failure
Replace if failure.
Indoor PCB failure
Replace the PCB if the photon coupling on indoor PCB is
failure.
Indoor PCB failure Replace after checked failure.
No cooling or
heating.
Water drops from
indoor unit
Insufficient
cooling or heating.
No display on
indoor unit.