I have a weird wiring fault.
The kitchen and the dining room each have dimmer switches that work fine individually. However, if the dining room dimmer is on and within a certain range of positions (about halfway), the kitchen dimmer dims both sets of lights (not fully, but to some extent).
I can't imagine this being by design. What type of miswiring could explain these symptoms?
edit: Both lights are on the same circuit.
Looking inside, the kitchen dimmer looks uninteresting:
The back box in the dining room is, frankly, a mess:
Suspiciously, the dining room dimmer has two wires connected to the L1 terminal:
I've not yet attempted to trace what goes where, but would love to hear your thoughts on what might be going on here.
P.S. The dining room has a single LED bulb which is well below the 60W minimum the dimmer is rated for. I doubt that's relevant, but am mentioning for completeness.