chaffoteaux and maury mx2?

our boiler is 7yrs old and we have problems with the circuit board with keeps blowing we have had 20 new circuit boards in the past 3yrs which the gas board have surplied thank god because they are £200 each time (thank god for home care) the gas board have run checks on the boiler and every thing else is ok but on the circuit board there are three fuses which arnt getting blown when the boiler breaks down the circuit board is just getting fryed in the past 5 weeks they have fitted 4 circuit boards can anyone help me please the boiler is a chaffoteaux and maury mx2