Hotpoint hob - one knob control not sparking
Hi, I have the Hotpoint G640SX Built In Gas Hob about 5 years old, one of the 4 knobs for the back right ring does not spark when I press it so I have to press another knob to get it to spark to make the back ring ignite the gas. The other 3 knobs all make the 4 rings spark so its not the spark thats the problem, the knob looks ok and I have tried swapping them over to no avail. Any ideas anyone? thanks.