Thor Motor Coach Class B+ Owner's Manual page 106

Electrical Systems
WFCO
Note: The WFCO inverter is a "dumb" inverter. This means that in order for
shore power to pass through, the inverter's power must be on.
On/Off button
Turns the inverter on and off.
LCD Display
Indicates operation status.
LED Indicator
Yellow - Battery backup status
Green - AC input status
Red - Inverter failure
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