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Mend Myson Economist Combi Boiler Set

how can i fix my myson economist combi boiler?

i'm having problems with my myson economist wall mounted boiler.
when set to auto,the central heating turns on at the set time but turns itself off after approx 1 hour.
it wont turn itself on when set to 'once' or 'continuous' and when 'advanced' it wont turn itself on.
the water is fine

a.o'brien
December 2011

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