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vaillant boiler wont ignite?

tries to light every 10 secs or so but nothing happens. pressure bar is in higher red what can i do to get it working

peter
May 2009
VaillantHeating, Home Heating SystemsBoiler Light Pressure Red
drain some water off a radiator

b
May 2009

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how do I rectify the fault as detailed below?

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Vaillant ecoTEC 831 Plus

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