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Troubleshooting
48. MM Nonreversing Models: Motor Does Not Run With Door Closed, Cycle
Selected and Start Button Pressed
120 Volt/60 Hertz/1 Phase Gas and Steam; 208-240 Volt/60 Hertz/3 Phase Gas; 480 Volt/60
Hertz/3 Phase Steam
NOTE: Voltage checks referenced to are for neutral unless stated otherwise.
MM Nonreversing Models:
Motor does not run with
door closed, cycle selected
and start button pressed
Is there
120 VAC to the
COM of the door
switch?
TMB2175S-a
Correct wiring
between door
switch and L1
supply for low
voltage units.
Check between
door switch and x1
of transformer for
high voltage units.
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.
Yes
No
No
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.
Gas Models:
Is there 120 VAC
across the coils of
the CR1?
Correct wiring
to the coil of
CR1.
Gas Models:
Is there 120 VAC
to terminal 1
on CR1?
Correct wiring
between terminal
1 and door switch.
Gas Models:
Is there 120 VAC
to terminal 3
on CR1?
Replace
CR1.
Gas Models,
120 VAC units: Is there
120 VAC across the
terminals 1 and 4 of
the motor?
Correct wiring
to motor.
Yes
No
Yes
No
No
No
Yes
No
Yes
No
Continued on
next page
Steam Models:
Is there 120 VAC
across M coil?
Correct the
wiring to M coil.
Replace
motor.
Yes
No
Yes
Yes
Yes
Yes - Steam Models
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