Halstead ace boiler locking out after 30 secs. ?

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