If your gas range keeps clicking on its own after you turned the burner off, moisture is almost always the cause. A spill or steam got into the igniter area during cooking, and the spark module keeps firing until it dries out. It usually quits within an hour or two. If it does not, here is what is happening and when to get someone in. Same story across GE, Samsung, Whirlpool, Frigidaire, and KitchenAid gas ranges, since they all use a spark module and electrodes.
Why it keeps clicking
Moisture under the cap. The most common by far. Steam or a boilover sits next to the electrode, the module senses conductivity, and it fires. Clears once the area dries.
Food residue on the electrode. The small white ceramic nub next to each burner is the electrode. A crust of food or carbon on it can create a partial short that triggers clicking.
Cap sitting crooked. The cap has to sit flat and centered on the burner head. Even a slight offset changes the ground path. Sounds too simple, but it is probably the second most common cause after moisture.
Cracked electrode tip. Over time the ceramic insulator cracks, lets moisture in, and clicks intermittently or constantly. A cracked electrode needs replacing, and that is not homeowner work.
Worn igniter switch. Each knob connects to a small switch that tells the module to fire. Sticking or worn, it sends a continuous signal. More common on older ranges or ones that have taken a lot of spills.
Failing spark module. The board that feeds voltage to all the igniters. As it goes bad it fires burners at random, sometimes one, sometimes all at once.
What you can check yourself
Unplug the range. Pull the grate and cap, dry the igniter area with a paper towel, and leave the caps off for 20 to 30 minutes. Surface residue on the electrode tip cleans off with a dry toothbrush. Reseat the cap flat and centered before plugging back in. That is the extent of it without tools or parts. Switch testing, module replacement, anything in the wiring harness, that is a tech.
What a tech does
First step is narrowing it down: one burner or all of them. One burner is almost always local, meaning moisture, a dirty electrode, a crooked cap, or a bad switch. All burners at once points to the module. From there a tech tests the switch with a meter to confirm it is signaling when it should not be, inspects the electrode for cracks or carbon tracking, and isolates the module by disconnecting switch leads one at a time. Most single-burner issues run under an hour, and igniter and switch parts are usually stocked or easy to source.
When to call us
Call if drying and cleaning did not stop it after a couple of hours, if all burners click, if you can see a cracked or damaged electrode tip, if it clicks after sitting off and cool for a long stretch, or if you smell gas at any point. On a gas smell, shut the range off, open windows, and call immediately.
A clicking igniter draws power constantly and will not fix itself when the cause is a bad switch or module. Bay Area Appliance Repair Service handles gas range repairs across the whole Bay Area, often same or next day. Our $75 diagnostic is credited to the repair, with a written repair-or-replace call and price after the visit. Call (925) 999-4095 or book on the contact page.