I have a ladder radiator in bathroom which won't turn off! Heating is off at boiler, I have turned room thermostat to zero, TRV is on 0, I've even turned dial on boiler to Summer setting i.e. hot water only. Boiler is a Worcester combi 24i. any ideas?
The radiator may be connected to the hot water circuit, this was pretty common a few years ago and is still requested now to keep a warm bathroom and towels during summer months when main heating isn't being used