Alliance Laundry Systems CA050L - OM Control: No Display After Selecting ON;SELECT Keys

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Troubleshooting
23.OM Control: No Display After Selecting One of the ON/SELECT Keys
120 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing
208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing
208-240 Volt/60 Hertz/3 Phase Gas and Steam Reversing/Nonreversing
208-240 Volt/60 Hertz/3 Phase Electric Reversing/Nonreversing
460-480 Volt/60 Hertz/3 Phase Gas, Electric and Steam Reversing/Nonreversing
OM Models: No
display after
selecting one of
the on/select keys
Is there voltage
across the
primary of the
transformer?
Correct wiring
between
transformer
and supply
voltage. Check
fuses.
Is there 24 VAC
across terminals 1
& 4 of
transformers
secondary?
Replace
transformer.
Is there 24 VAC
across terminals
H3-3 and H3-4 on
the micro control?
Correct wiring
between H3 and
transformer.
TMB1894S
Is there voltage
to the input of
the fuse on the
micro control?
Replace micro
control.
Is there voltage to
the opposite side
of the fuse on the
micro control?
Check fuse
making sure it
is not blown.
Replace if
necessary.
Replace micro
control.
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
TMB1894S