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Mend Worcester Heatslave 20/25 Boiler Heating Thermostat

Fix my Worcester Heatslave 20/25 oil boiler?

Worcester Heatslave 20/25 boiler 10 years old - over heating the domestic hot water, dangerously hot despite adjusting the temp dial. Tried new thermostat and flow switch.
Heating side seems fine.

san49
October 2013

Worcester Worcester Heatslave 20/25 Heating, Home Heating Systems Boiler Heating Thermostat

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Worcester Heatslave 20/25 Boiler - Overheating