i have fitted new flow and pressure switch to boiler this seemed to cure the problem at the time, 2 days latter it has started cutting out again, could this be an overheat problem.
boiler make?
boiler model?
fault indicator lights flashing?
in what sequence?
does problem affect DHW or CH or BOTH?
no detailed information given
no help can be offered
looks like you'll be paying someone for a breakdown visit