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where is the loop fill valve?

need to repressurise my saunier duval semia condens boiler as i have display code 21

Emma
December 2010
Saunier DuvalHeating, Home Heating SystemsWhere Loop Fill Valve
do you mean " thema" if so in the center of the boiler about 3 ins / 75 mm from the front there is a large blue knob similar in shape to a screw on toothpaste top turn this anti-clockwise to fill you can also go to s/duval web site

brian
December 2010

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