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I have purchased a metal face varilight one way touch dimmer to replace a single switch for 6 12v 50w halogens in living room. The wiring on the existing switch is L1 (red), L2(red,red,yellow), L3 (red, blue) with 3 black commoned together. When connected in dimmer as L1 into LOAD, L2 LIVE, and L3 into SLAVE and earthed it works but when switched off after a few minutes comes back on also the fans in upstairs bathrooms constantly operate at low revs. Could it be due to the touch type used and connection of returns through fans.Any suggestions?.