What Happened? Could It Be An Error - Mitsubishi Electric PLK-J-CU-20S Technical Manual

[10] What happened? Could it be an error?

When an error occurs, the error code and corresponding message appear on the operation panel. Take a
corrective action in accordance with the message. This section describes the errors and others that do not
appear on the operation panel.
[Case1]
Nothing appears on the operation panel when you turn the power switch ON.
"Both the front panel green (power) and red (warning) LEDs are off."
[Checking Items and Corrective Actions]
Is the power switch definitely turned ON?
▪Check the power supply connection and turn ON the power switch again.
Is the power supply connector fully connected?
▪Check the power supply connector connection, contact state and others, and
then turn ON the power switch again.
Refer to "section [13]."
Is there a blown fuse in the control box?
▪Replace the blown fuse with a fuse of identical capacity.
Refer to page [2] - 2.
Is a harness inside the control box disconnected?
▪Check the connections of the harnesses inside the control box, and turn ON
the power switch again.
Refer to "section [16]."
▪Be sure to turn off the power when checking.
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