Potterton profile 60e not igniting

[Sreading90]

Hi there first time trying this site

Right my potterton profile 60e will not light up the pilot light is on and goes off when I turn boiler off but will not light fully have got it to light up when I give the boiler a little tap but now will not light
Can anyone give me some advice as what it could be

Thanks Sam

 

[Sreading90]

Sorry forgot to add a few things
Fan is running fine and replaced aps yesterday and lit up straight away and now it stopped working again I'm thinking it's either a sticky gas valve or pcb giving troubles