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Mend Worcester heatslave 20/25 Radiator Heating Problem

Worcester Oil heatslave 20/25 rads coming on when selected off position?

I have a Worcester Oil heatslave 20/25. Have selected heating to off position & water to on position as normal for the summer season. Even though the heating is at the off position the radiators are coming on so I am having to switch the water off and just put it on as I need hot water. Any ideas what can be the problem?

Julie
May 2013
WorcesterWorcester heatslave 20/25Heating, Oil Filled RadiatorsRadiator Heating Problem

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Worcester Heatslave 20/25 Radiators On - Help!