It's not the water pump. That one is clearly labelled on the touch buttons.
I was thinking it's the step light. I have turned the switch both ways and looked at the amber light under the steps and see no difference. Maybe a bad fixture or bulb though. I also looked in the door frame for a light switch activated by opening the door and didn't see anything.
Mystery switches like that one could be 1) the step light (bulb could be out), 2) exterior outlet at the front doorside, 3) baseboard lights by the interior steps, 4) awning light strip.
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