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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
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
link Click here to see other fixes for Saunier Duval.