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Troubleshooting
41. MM Models: Cylinder Motor Does Not Run or Reverse With Door Closed,
Cycle Selected and Start Button Pressed In Reversing Mode or
Nonreversing Mode
480 Volt/60 Hertz/3 Phase Steam Reversing and 208-240 Volt/60 Hertz/3 Phase Gas and Steam
Reversing Models
NOTE: If the unit will not reverse when reversing is selected, check for proper operation and wiring of
reversing switch. Replace if necessary.
MM Models: Cylinder
motor does not run or
reverse with door closed,
cycle selected and start
button pressed in
reversing mode or
nonreversing mode
Is there120 VAC
to the COM terminal
of the door switch?
TMB2168S-a
Correct wiring
between door
switch and L1
supply for 208-240
Volt units. Check
transformer on
480 volt.
Is there 120 VAC
to the N.O. terminal of
the door switch?
Check for proper
operation of door
switch arm and/or
replace door
switch.
Is there 120 VAC
to terminal P2 of the
micro control?
Correct wiring
between door
switch and micro
control.
Is there 120 VAC
to terminal P1 of the
micro control?
Replace
micro control.
Is there
120 VAC across the
coils of the motor
contactor?
Correct wiring to
the coil of motor
contactor.
Yes
No
No
Yes
No
Yes
No
No
Is there
voltage to terminals
L1, L2, and L3 of motor
contactor?
Correct wiring
between motor
contactor terminals
and L1, L2, L3
of TB1.
Is there
voltage at terminals
T1, T2 and T3 of the
M contactor?
Replace motor
contactor.
Is there
voltage to terminals
T1, T2, T3 on the forward
contactor and voltage to
terminals U, V and W on
the reversing
contactor?
Correct wiring
between forward
contactor and
motor contactor
and/or correct
wiring between
reverse contactor
and motor
contactor.
Yes
Yes
No
No
Yes
No
Yes
Continued on
next page
Yes
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