Replacing a bathroom PIR switch with a cord pull switch. The switch controls the light and the extractor fan. Two cables coming from the ceiling at the switch with two core and earth in each. I put the two live red wires, one from each cable, into the COM terminal and the two black neutral wires into L1. Turn on the power again at the consumer unit and the light and fan come on which is fine but operating the switch to turn them off trips the circuit. Same happens if I put both neutrals into L2.
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