Hello Bill, my name is George..It sounds like for some reason your burner flame is being starved of oxygen, or the valve is set too low to burn in that enviroment.The sparking is caused by the reigniter which detects that the flame at the burner is too low and tries to re-ignite the gas.You will need a Gas Safe engineer to call and check and make any necessary adjustments to the appliance.Please rate the assistance given by me & kindly be patient whilst awaiting any responses from me as I'm not constantly available.
mhh, this seems to make a bit of sense now. I seem to recall that ever since the oven was new, there was heat escaping from the sides of the door. and i have only just got round to replacing the hinges, giving it a god tight seal now, as the door shuts nice and tight and no heat escapes. Seems that whilst the door wasn't shutting fully, oxygen was being allowed to enter and keep a good flame going. Does this sound feasible? Can you also tell me if the door seal should be constant or if there should be a section missing to allow air in? I replaced the seal a couple of years ago to try and address the heat escaping (didn't resolve it) and i seem to recall there may have been a gap, but i cut the new one to fit all the way round, thinking there was a section missing.
I have cut away a small section of the seal and it is now operating normally. Thanks.