Gas Cooktop: Gas burners won't ignite or spark
A surface burner igniter switch and a spark module control the sparking for burners. A power supply problem, failed igniter switch, bad spark module or wiring failure in the spark ignition circuit can prevent the electrodes from sparking.
On most cooktops, the igniters will spark on all burners when you turn on any one of the burner knobs. If only one of the burner knobs fails to initiate sparking when you turn that knob on, then the burner switch or wiring for that burner likely failed. Unplug the cooktop, check the wiring for that burner and repair any broken wires. If the wires are okay, you'll likely need to replace the burner switch for the burner you turned on because the switch isn't sending a signal to the spark module.
If none of the burner switches initiate sparking, then a power supply problem, wiring failure or a failed spark module is likely preventing the igniters from sparking. Make sure you have the cooktop plugged into a working electrical outlet. Check the electrical outlet for power by plugging a small lamp or appliance into the outlet. If the outlet is dead, reset the house circuit breaker for that outlet. If the outlet still doesn't work, have an electrician repair the electrical outlet. If the electrical outlet is okay, unplug the cooktop and replace the power cord if damaged. If the power cord is okay, check the wiring in the entire ignition circuit and repair any broken wires. If the wires are okay, you'll likely need to replace the spark module because it isn't sending current to the electrodes.
If all burners spark when you turn on a burner but none of the burners light, check the gas supply shut-off valve to make sure it's fully open. If the shut-off valve is fully open, you may need to have your gas supplier check the gas supply pressure. If gas supply pressure is okay, a failed pressure regulator on the cooktop may be preventing gas from flowing to the burners.
If only one burner fails to ignite and that burner's electrode sparks, then a spill may be blocking the burner head's ignition port. Clean the burner if it's clogged.
Replace the cooktop spark module
The spark module is in the ignition circuit for the gas burners. When a burner control knob is turned to the Lite position, it provides voltage to the spark electrodes on the gas burners. If the spark module fails to provide the electrodes with voltage, then it should be replaced.
Replace the cooktop spark igniter switch
The igniter switch is an electrical switch on the stem of the gas surface burner control valve. This switch completes a circuit to the surface burner spark module, causing the burner igniters to spark when the burner switch is turned to the Lite position. Replace the burner igniter switch if the burners don't spark when you turn the burner control knob to the Lite position or if igniters spark constantly even when the burner knobs are in the Off position.
Replace the cooktop power cord
The cooktop power cord can deteriorate over time. Check the insulation for cracks or bare spots. Replace the power cord if it's damaged or doesn't work because of a break in the wiring.
Replace the cooktop pressure regulator
The stovetop pressure regulator limits the gas pressure going to the burners. If the gas pressure is too high, the burners won't ignite properly, and the flame increases or goes out. If the pressure regulator doesn't properly control the gas pressure, replace it.
Follow these step-by-step instructions to fix the surface burner ignition system on your gas cooktop by replacing the spark igniter switches.
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