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how can i rectify F40?

fault F40 keeps coming up on my boiler. boiler tries to work when i shut down and re start but then goes off again . how can i rectify this problem and what is causing it.j.malarkey

j.malarkey
October 2009
Heating, Home Heating SystemsComing Boiler Work
make / model of boiler?

Ian
October 2009

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