Hi , just moved into a property , and have recently discovered the radiator in the bathroom,( which has no rad thermostat) heats up when we run the hot tap . It's a combi boiler , potterton lynx 2 , not sure how old it is , the CH is set to off just now during summer, any ideas , possibly diverter valve ? and any idea the cost to repair and is it a diy job ?
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