42 M411429
Section 3 Troubleshooting
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
W002
WARNING
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
45. MM MODELS: NO DISPLAY AFTER PRESSING THE ON/SELECT KEYS
120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing
480 Volt/60 Hertz/3 Phase and 208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing/Nonreversing
NOTE: Make sure fuse on X1 line of transformer is operational. Used for 480 Volt/60 Hertz/3 Phase voltage.
NOTE: If unable to change settings, the key board had been manually locked out. To lock or unlock, press
and hold the START pad and press TIME.
46. MM MODELS: MOTOR DOES NOT RUN WITH DOOR CLOSED, CYCLE SELECTED AND
START BUTTON PRESSED
208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing and Nonreversing
480 Volt/60 Hertz/3 Phase Gas Nonreversing
480 Volt/60 Hertz/3 Phase Steam Reversing
NOTE: Make sure fuse on x1 of transformer is operational (480 Volt/60 Hertz/3 Phase units).
Step Problem If No, then
1 Is there 120 VAC across COM and Neutral (P3) terminals
on PC board? If yes, replace PC board.
Correct wiring between TB1-L1 and COM on PC board
or between TB1-N and P3 (Neutral) on PC board for low
voltage. Correct wiring between COM on PC board and
X1 of transformer for 480 Volt/60 Hertz/3 Phase voltage.
Step Problem If No, then
1 Is there voltage to the COM of the door switch? If yes,
continue to next step.
Correct wiring between door switch and L1 supply for
208-240 Volt units. Check between door switch and X1
of transformer for 480 Volt/3 Phase units.
2 Is there 120 VAC to the N.O. terminal of the door switch?
If yes, continue to next step.
Check for proper operation of door switch arm and/or
replace door switch.
3 Is there 120 VAC to terminal P2 of the micro control? If
yes, continue to next step.
Correct wiring between door switch and micro control.
4 Is there 120 VAC to terminal P1 of the micro control? If
yes, continue to next step.
Replace micro control.
5 Is there 120 VAC across the coil of the motor contactor? If
yes, continue to next step.
Correct wiring to the coil of motor contactor.
6 Is there voltage to terminals L1, L2, and L3 of motor
contactor? If yes, continue to next step.
Correct wiring between motor contactor and terminals
L1, L2, L3 and TB1.
7 Is there voltage at terminals T1, T2 and T3 of the M
contactor? If yes, continue to next step.
Replace motor contactor.
8 Is there voltage to L1, L2 and L3 at motor? If yes, continue
to next step.
Correct wiring between motor and motor contactor.
9 Replace motor.
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