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Mend Valliant GB221H Central Heating Thermostat Boiler

Thermostat Valliant GB221 H?

Would anyone know how to control the thermomstat for a Valliant GB 221 H boiler? Having a nightmare with central heating being off and on at random times!!!!

SianyArmani
April 2011
ValliantValliant GB221HHeating, Home Heating SystemsCentral Heating Thermostat Boiler

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Valliant GB221H Thermostat Control & Issues