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hi - my father-in-law is having a problem with his daughters house, all the houses Ive ever lived in have had 2 separate lighting circuits.... an upstairs and downstairs.. with 2 separate fuses/circuit breakers. recently a light bulb went in a room downstairs, the light bulb was changed but...

yeah Ive seen this with our older system. Its a very simple system but we suddenly found that the radiators did not work? they were all cold? even though we still had normal hot water. this turned out to be the motorized valve that was not opening. A replacement motorized valve cost about £20...