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800170
Section 3 Troubleshooting (MDC Models – Washer Control)
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
26. DOOR LOCKED, MOTOR DOES NOT RUN (E:df on display)
Replace
motor.
Is
120 Volt AC
present at terminals
1-3 on transformer?
Is
240 Volt
present on the
motor control at terminals
FS3 to FS2?
Is
20 Volt AC
present on the motor
control at terminals
H1-7 to FS2?
Is
120 Volt AC
present at terminals
H6-6 to H6-5 on the
electronic display?
Replace
electronic
control.
(1)
YES
YES
YES
NO
NO
NO
NO
Using an Ohmmeter,
check white wire and brown/
yellow wire coming into
transformer for broken/poor
connection.
YES
Using an Ohmmeter, check
red wire from transformer
to FS3 on motor control
board for broken wire/poor
connection. If none found,
replace transformer.
Using an Ohmmeter,
check red/black wire
from transformer to H1-7
on motor control board
for broken wire/poor
connection. If none
found, replace
transformer.
TRANSFORMER
(2)
Is there
continuity?
Check continuity at terminal strip on motor:
TACH INPUT Terminals 6-7 Approximately 15 Ohms
BRUSHES
Terminals 4-5 Less than 70 Ohms
Winding
Terminals 1-3 Approximately 1.1 Ohms
Winding
Terminals 1-2 Approximately 2.0-2.4 Ohms
Winding
Terminals 2-3 Approximately 3.4 Ohms
*Resistance values may vary
depending on type of meter used.
NO
Replace
motor.
YES
MOTOR
Using an
Ohmmeter, check
for continuity between each
terminal and the motor
housing.
NO
Is there
continuity?
YES
(3)
(4)
Is
there continuity
through the motor harness
from plug H-2 and H-5 on the motor
control, to the plug at the
motor?
NO
Replace
harness.
YES
Is the
fuse blown on the
motor control
board?
YES
Replace
fuse.
NO
Does
the machine
run now?
Replace motor
control board.
NO
Replace motor
control board.
TRANSFORMER
