Om Models: No Display After Selecting One Of The On/Select Keys - ALLIANCE AT050L Service Manual

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.

22. OM MODELS: 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
Step Problem
1 Is there voltage across the primary of the transformer? If
yes, continue to next step.
2 Is there 24 VAC across terminals 1 & 4 of transformers
secondary? If yes, continue to next step.
3 Is there 24 VAC across terminals H3-3 and H3-4 on the
micro control? If yes, continue to next step.
4 Is there voltage to the input of the fuse on the micro
control? If yes, continue to next step.
5 Is there voltage to the opposite side of the fuse on the
micro control? If yes, continue to next step.
6 Replace micro control.
70269301 © Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
WARNING
If No, then
Correct wiring between transformer and supply voltage.
Check fuses.
Replace transformer.
Correct wiring between H3 and transformer.
Replace micro control.
Check fuse making sure it is not blown. Replace if
necessary.
Section 3 Troubleshooting
W002
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