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“
no lights on qel
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Why would the controller on my 4600 (4630/4640) have no lights on display when powered with 120 VAC?
Resolution:
Verify that the 120VAC is present at the controller (measure 120VAC on the 2 wire gray cable from I/O board to controller -- red/black wires in gray cable). If present, but no lights on the contr...: