18 American Dryer Corporation 450412-4

Lint Door Switch Replacement

Discontinue electrical power to the dryer.
Remove the lint door panel. (For the ML-122.)
Remove the front panel. (For the ML-96.)
Disconnect both 4-pin connectors at the rear of the lint
switch cover.
Remove the 2 screws holding the lint switch cover on.
Remove the lint switch cover and disconnect the 2 terminals
of the switch.
Remove switch by pressing tabs together and pushing
switch out.
Install new switch by reversing these procedures.
Troubleshooting _____________________
IMPORTANT: You must disconnect and lockout the
electric supply and the gas supply or the steam supply
before any covers or guards are removed from the
machine to allow access for cleaning, adjusting,
installation, or testing of any equipment per OSHA
standards.
The information provided will help isolate the most
probable component(s) associated with the difficulty
described. The experienced technician realizes, however,
that a loose connection or broken/shorted wire may be at
fault where electrical components are concerned...and not
necessarily the suspected component itself.
IMPORTANT: When replacing blown fuses, the
replacement must be of the exact rating as the fuse
being replaced. The information provided should not be
misconstrued as a handbook for use by an untrained
person in making repairs.
WARNING: All service and troubleshooting
should be performed by a qualified
professional or service agency.
While making repairs, observe all safety precautions
displayed on the dryer or specified in this manual.
!

No L.E.D. display on microprocessor

controller (computer)...

Open circuit breaker switch or blown fuse.
Tripped blower motor overload.
Faulty wiring connection.
Faulty transformer.
“Emergency Stop” (E-Stop) button is depressed.
Faulty microprocessor controller (computer).

Computer will not accept keypad entries...

Keypad ribbon is not plugged into computer securely.
Faulty keypad.
Faulty microprocessor controller (computer).

Dryer will not start, but computer

L.E.D. indicators are on...

Failed contactors.
Failed arc suppressor board.
Failed microprocessor controller (computer).
Failed motors.

Blower motor runs, burner is on,

but tumbler will not turn...

Broken, damaged or loose V-belt.
Damaged or misadjusted drive wheels.
Loose or broken pulley.

Dryer operates but is taking

too long to dry...

Improperly programmed microprocessor controller
(computer).
An inadequate exhaust ductwork system.
Restriction in exhaust system.
Insufficient make-up air.
Dirty or clogged lint screen.
Washing machine extractors are not performing properly.
The supply gas may have a low heating value, check with
local gas supplier.
Failed temperature sensor (temperature calibration is
incorrect).
Failed microprocessor controller (computer).

Thermal overload for drive motor

is tripping...
Either an exceptionally low or high voltage supply.
Motor bearing failure.
Motor vents are blocked with lint.
Failed motor.
Failed overload.
Insufficient make-up air.