The most likely cause of the boiler fault is afaulty ignition box. This is fitted onto the gas valve.
There are two types that could be fitted, a single colour royal blue box part number 6210203 or a two tone coloured box with a turquoise side part number 6210205. Parts can be obtained from HRPC. Sime can be contacted on 08709911114 or enquiries@sime.ltd.uk
terry brow
August 2007