Had a problem with the boiler in that after about ten minutes or so, the water went cold..becuase the burners had gone out....Boiler engineer came round and said its probably the air pressure switch, which has now been replaced. Now the boiler takes ages to fire up, but it has fixed the initial problem? So I turn the hot tap on or shower and takes about 3 or 4 minutes for the burner to fire up...any suggestions would be greatly appreaciated. Its a Ariston EuroCombi.

Nathan Fryer, February 2011