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Ok, I have 2 x GU10 Halogen bulbs on my landing (one at each end). I purchased 2 x GU10 LED bulbs to replace them. The problem is, if I put both LED bulbs in, I can't turn them off. However, with one halogen and one LED bulb in, the light switch functions correctly. Any ideas please ?

Hi All, I've spent an hour or so looking through the threads and can't seem to find an answer. System is 3 years old Boiler is an ICOS HE15 Water Tank/Heater is an OSO Indirect 20RI system A red tank to take care of the water pressure. This has a black arm sitting at 1...