Trouble Shooting - Midea MLTE45N4BWW Service Manual

Service manual for Dryer Machine

4.5 Trouble shooting

No Problem
Will not start or
1
run
Motor runs/
2 tumbler will not
turn
Runs a few
3 minutes and then
stops
Blows fuses or
4 trips circuit
breaker
Blows fuses or
trips circuit
5
breaker (Gas
model)
Will not heat
6
(motor runs)
Will not dry gas
7 Model poor gas
Ignition
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What To Do
● All wires are hooked up to their corresponding terminals.
● Dryer is plugged in.
● Blown fuse or circuit breaker.
● Door switch functional...door closed.
● Star/Pause button rotary selector dial functional.
● Control Board operational.
● Belt off or broken and Belt Cut-off Switch operates.
● Drive motor functional.
● Check motor winding resistance: 2.88 ohms between pin #3 and 4,
3.5 ohms between pin #4 and 5.
● Belt off or broken/ damaged.
● Idler tension spring too weak or stretched.
● Idler pulley jammed or stuck.
● Lint buildup around drive motor.
● Low voltage present.
● Blower impeller blocked in blower housing.
● Drive motor – start switch contacts stuck closed.
● Check if manual thermostat tripped---- press the red button on the
thermostat to restart the dryer (Clean filter and exhaust duct to prevent it
happen again)
● Is the belt connected well?
● Is the winding of the motor continuous?
(Rotor winding, stator winding, generator)
● Is the motor protector normal?
● If above points are not found, the PCB assembly is out of order.
Replace it.
● During ignition the dryer will draw X amps. With the burner ON, the
dryer will draw X amps. If the dryer is drawing amperages above this,
then the house wiring, fuse box or circuit breaker is suspected to be at
fault.
● Igniter harness loose and shorted to base.
● Incorrect wiring or wire shorted to ground.
● Drive motor winding shorting to ground.
Open heating element
● Hi-Limit trips easily or is open.
● Regulating thermostat trips easily or is open.
● Membrane switch open.
● Check thermistor.
When the dryer is operated on a heat setting, the igniter should be
energized and burner shall fire within 45 seconds at 120 VAC. The
failure of a component in this system will usually be indicated by one of
－ 32 －
Midea America Company