Hello, My Creda cookertop ignition system has a problem . There are 4 burners on this CT. 2 diagonally across burners cannot ignite when their knobs are activated but they show sparks of ignition when the knobs of the other 2 burners are turned on. Mystifying ? What can be the cause ? Is the root cause a direct issue with these 2 faulty knobs as their ignitors respond normal with the other knobs ?

Thanks. I've circumvented the problem by turning on the knob of the target burner to allow gas flow at close to minimum and simultaneously turn on the good/working burner knob to create spark in all the 4 burners. Then turn off the latter as soon as the target burner is alight. In this way I do not need to resort to a manual or hand held sparking device.
Hope this sharing can help those with this odd problem which problem needs rewiring at the faulty connections of the defective knobs. Thanks. I've circumvented the problem by turning on the knob of the target burner to allow gas flow at close to minimum and simultaneously turn on the good/working burner knob to create spark in all the 4 burners. Then turn off the latter as soon as the target burner is alight. In this way I do not need to resort to a manual or hand held sparking device. Hope this sharing can help those with this odd problem which problem needs rewiring at the faulty connections of the defective knobs.