Alliance Laundry Systems CA050L - Control Has No Display

102 70422101
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On Premise Micro Control (OM) Troubleshooting
55.Control Has No Display
Control Has No
Display
Is there
power supplied
to the unit?
Is there
120 VAC
at input of
primary fuses?
Yes
Plug unit in
and start cycle.
No
Correct wiring
between primary
fuse and power
supply.
No
Is there
120 VAC across
terminals 1 & 2 of
transformer
primary?
No
Correct wiring
between primary
fuse and
transformer.
Is there
24 VAC across
terminals 1 &
4 of transformer
secondary?
No
Replace
transformer.
TMB2251S
Yes
No
Correct wiring
between
transformer and
control.
Is there
24 VAC across
H3-3 and H3-4 on
the control?
Yes
Is there
120 VAC at
output side of the
primary fuses?
No
Replace primary
fuse(s).
Yes
Gas, steam and electric heat.
Single and three phase power supply.
(1)
(2)
(3)
Is the
control fuse
functional?
Replace
control fuse.
Replace
control.
Yes
No
(4)
(5)
(6)
Yes
Yes
TMB2251S