since I have an AGS with a remote panel to control it, thru the Magnum Inverter, I have a unit like this, but mine does not have the physical dials since it is only the controller - the settings are all done with the remote, from the inside of the coach.
I was a little confused with the photo of the AGS module, because it has no 'Enable', 'Off', or 'Enabled with Quiet Time' buttons - so, I can only assume that IF you choose either the TEMP or VOLTS setting, and turn either PAST the 'OFF' position, you will have therefore 'Enabled' the AGS (otherwise giving it the 'READY' status, where the light should then be present, confirming that.
'QUITE TIME' would be the same, it would only be activated IF the dial is turned PAST the 'off' position(and the time is set correctly, of course)
: ) Hopefully this helps, if you actually DO have this module.
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