Leaking water, plumber advised new circuit board required purchased at great expense. Fitted still not working, turns on water and heating lights up then locks out. At a loss what to do. Any advise most welcome

Rugbywoody, December 2013

If the pump is working then get a proper service which will include a clean of the aps venturi. Also these boilers suffer from breaking down of the ht leads which may need replacing or protecting with silicone tape. Giving the burner a wash will also help as the software does not allow for the split second timing difference a dirty boiler takes to work, hope this helps.?

Rich the gas man., January 2014

Look like pump pack up ,look for is pump working ,than comes fan ,than pressure switch

ltd, December 2013