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

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Trouble shooting
28
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 /-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 tank full Check and pour if the water tank is full.
Water depth sensor if
failure
Check and replace if failure.
Water pump failure Check and replace if the pump if failure.
Water depth is over load
in chassis Check and drainage the water in the chassis by open the
drainage hose on the chassis.
Water depth sensing
structure
Check and replace or realign if the structure 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.
Unit undersized
Determine if the unit is properly sized for the area to be
cooled or heated.
Condenser and
Evaporator
Clean or replace if restricted.
Water shower failure
Check the structure of water showering system and clean if
blocked.
Fan motor
Check the fan capacitor and replace if not /-10% of
manufactures rating.
Air flow
Clean or remove if any barrier is found to block the
inlet/outlet wind flow of the unit.
Less refrigerant
Check the tubes for reasons of leakage. Recycle the
refrigerant, correct the leakage points and recharge.