While you wait for answers, we may have found some information which could help you.
Click here for Oven Not WorkingRestarting after power cut?
Retrieving object behind Rangemaster cooker?
Convert lpg to electric Rangemaster cooker?
Bottom oven won't stay on unless you keep holding on to button ?
Ignition Fault?
Re setting clock on Rangemaster 110 gas cooker?