Appliance Repair Questions? Ask a Technician for Answers ASAP
There is always a significant fire hazard for any high energy appliance which has a fault, I dont see any issue in using the hib with this fault but would make sure the appliance is isolated\switched off at the wall when not in use.
Most likely its the spark generator if its not igniting, are all the burners not lighting (other than with a match).
Secondly can you provide me with the model number of the hob.