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Hi - we have had our bungalow replumbed - mains pressure tank, all new pipes, radiators etc and the plumber has fitted a PRV pump as a safety feature to pump water out through the loft to outside if pressure gets too high I assume? This is going off intermittently, approx 12 times a day, no...

Hi - I want to replace a double light switch. The new switch has COM, L1, L2 connections in two separate blocks. The old switch has the same, and for one block there are wires in all three, for the other block there is only COM and L1. I tried to replace with the new switch using the same wiring...