Rangemaster 110LPG Timer?

Hi there, I have a Rangemaster 110 LPG cooker. The clock flashes all the time, but when I reset it the right hand oven ignites all the time. Therefore I have to disconnest electric supply and re plug in, back to flashing clock! The oven will not light unless clock is showing a time. Also the warm plate on the top right hand side has stopped working
Any ideas? maybe if clock was disarmed, if so what is the best way of doing this?
Many thanks