Hi, if you look on the top of the boiler there should be 2 small nuts holding the front cover on. you may find that once the nut are removed it still will not move. this is because the cover is such a tight fit on the top of the facia. just carefully lever it up with a screw driver and off it will come. on refitting just put a small drop of silcon grease etc onto the top lip of the plastic facia that locates inside the front panel and it will come off easily next time.
Paul
July 2006