Hi I have been replacing downstairs light switches which include a 2 gang switch of which one switch controls an upstairs landing light the other a hall light I took photos before but can not get the upstairs light to work even when refitting the original switch the upstairs light is controlled by the downstairs switch or one of two upstairs
I would assume down stairs has just two wires. However you have two three core and earth so maybe not?
So standard two way lighting, simple two wires go to L1 and L2 (not com and L1 that's simple on/off.) Then three wires com L1 and L2 on both switches the wire colours same for both switches, the com is not used on the intermediate switch.
So guess is your showing intermediate switch wires and trying to connect them to a two way switch.
With three switches and one lamp, two are two way switches one is an intermediate switch (4 terminals).
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