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Mend Heating Thermostat Fault

fault with my boiler?

Help it looks like my wireless thermostat has crashed leaving me with no heating or water. How do i reset it? i have a white box next to boiler and there is a red light next to 'alarm'

andrew
January 2011
Heating, Home Heating SystemsHeating Thermostat Fault

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Boiler & Thermostat Issues - Reset Help