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There is a problem with the selection of switches, and Futaba switches (also called duplex switches) should be selected. Or there was a problem when the master who installed it for you installed it for you!
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1. The switches must be dual-control switches.
2. The wrong line is connected.
The single control switch can not replace the double control, this is a fact, the double control switch is three wires, the single control is two lines, and the two single controls can also control a lamp, but it is not a double control in the strict sense.
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To achieve dual control, two dual control switches must be used, which is different from ordinary switches.
3000 220 = amps The configuration is indeed a little smaller, and you can choose a 30W double-on/double-break switch. >>>More
You don't need dual control, the incoming line is connected to L, and the outgoing line is connected to 1. Three lines are combined together, and now there are two, and the third one jumps a short line.