Sounds like either a flame rectification probe / pcb issue
model is feroli optimax HE25S it is just flashing P01 and then if you touch the bottom minus button it goes up to p02 03 04 05 and stops at that.then every 5 mins or so it will revert to telling you the actual temp and what you have set it to( in this case 90C I cannot reduce it as the control seems stuck).What is exact model of boiler and what is/are the fault(s) code(s) you get?
A and F are the fault code letters on this particular boiler.
Not sure with P, and the fact you cant adjust it would suggest maybe a pcb fault!
Either way, you need a serviceman out me thinks...
(will check into P codes for this boiler tomorrow, as not list in the manuals)
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