Hi, welcome to Just answer
Please tell me how old is it
do you also hear any clicking sound ?
do you have its complete model number ?
the problem seems to be with the spark switch that is bad and needs replacement
you can also check the spark plug
when all igniters on cooker continuously operate and will not stop the problem is either with the spark plug or the spark generator switch
if you buy both of them it will cost you around £12 (total) for both parts
I am talking about these two parts.... part 1 and part 2 ....if these two parts appear fine then the problem is with the Spark Module that is bad and needs replacement
well you will have to unplug it and then turn off the supply and then remove main top to gain access to all these parts
Is there anything else I can assist you with today ?