Clicks after cleaning or a boilover
The clicking started right after wiping the cooktop, a spill, or a pot boiling over.
Start here: Dry the burner cap, burner base, and igniter area completely before doing anything else.
Gas cooktop noise troubleshooting
Thermador Gas Cooktop Keeps Clicking
Direct answer: If your Thermador gas cooktop keeps clicking, the most common cause is moisture or grease around one burner cap or igniter, not a bad part right away. Dry the burner area, reseat the cap, and see whether the clicking stops when all knobs are fully off.
Most likely: One wet or dirty burner head is making the ignition system think it still needs to spark.
Start by figuring out whether the clicking happens only after cleaning, only on one burner, or even with every knob off. That split tells you a lot. Reality check: one damp burner can make the whole cooktop click. Common wrong move: scrubbing the igniter with anything abrasive and cracking the ceramic tip.
Don’t start with: Do not start by buying an igniter module or taking apart gas components. Constant clicking is often a cleanup or switch issue first.
Clicks after wiping the cooktop?Let the burner area dry fully, then reseat the burner cap before testing again.
Clicks with all knobs off?Focus on a sticky burner knob or burner ignition switch before assuming the spark module failed.
Last reviewed: 2026-04-17
What the clicking pattern usually points to
Only one burner keeps clicking
The noise is strongest at one burner, or moving that cap changes the problem.
Start here: Check that burner cap alignment is correct and look for food crust or moisture around that burner igniter.
Clicks with all knobs in the off position
No burner is being used, but the cooktop still ticks or randomly starts sparking.
Start here: Look for a sticky burner knob stem or a burner ignition switch that is staying engaged.
Keeps clicking even after the flame lights
The burner lights, but the sparking continues for several seconds or does not stop.
Start here: Clean and dry the burner parts first, then watch whether the flame is crossing properly to the igniter area.
Most likely causes
1. Moisture around a burner cap, burner base, or cooktop igniter
This is the most common reason after cleaning, spills, or humid cooking. A little water in the wrong spot can keep the spark jumping.
Quick check: Remove the grate, lift the burner cap once the surface is cool, and look for dampness or water marks around the igniter and burner ports.
2. Burner cap out of position or burner ports blocked with grease
If the cap is cocked or the flame path is uneven, the burner may light poorly and keep sparking.
Quick check: Set the cap back in its proper seat and make sure it sits flat without rocking.
3. Sticky cooktop burner ignition switch at a knob stem
If clicking continues with all knobs off, one switch may still be telling the spark system to fire.
Quick check: Turn each knob on and back off one at a time. If one feels gummy, slow to return, or changes the clicking, that knob area is the lead suspect.
4. Failing cooktop spark module
If the cooktop is dry, caps are seated, switches feel normal, and the clicking is random or constant, the spark module becomes more likely.
Quick check: Listen for clicking at multiple burners with no clear wet burner or sticky knob causing it.
Step-by-step fix
Step 1: Shut it down and separate a wet-burner problem from a switch problem
You want to know whether the clicking is tied to recent moisture or whether the ignition system is being held on by a knob switch.
- Turn all burner knobs fully to OFF.
- If any burner is lit, turn it off and let the cooktop cool completely.
- If you smell gas, stop using the cooktop, ventilate the room, and do not keep testing.
- Think back to when the clicking started: right after cleaning or a spill usually points to moisture first.
- With the cooktop cool and all knobs off, listen for whether the clicking is steady, random, or tied to touching one knob.
Next move: If the clicking stops on its own after the cooktop dries and cools, moisture was likely the cause. If it keeps clicking with every knob off and no recent spill, move to the knob and switch checks next.
What to conclude: A recent spill or wipe-down usually means water is bridging the igniter area. Clicking with all knobs off leans more toward a sticky ignition switch or spark module.
Stop if:
- You smell gas at any point.
- A burner will not shut off normally.
- You see arcing somewhere other than the burner igniter area.
- The cooktop surface is cracked or damaged.
Step 2: Dry and clean the burner that looks suspicious first
One dirty or damp burner is enough to keep a gas cooktop clicking, and this is the safest fix to try first.
- Remove the grate over the problem burner.
- Lift off the burner cap and set it aside in the same position it came from.
- Use a dry cloth or paper towel to remove visible moisture from the burner cap, burner base, and around the cooktop igniter.
- If there is greasy residue, wipe with a lightly damp cloth and a drop of mild dish soap, then wipe again with clean water and dry thoroughly.
- Clear loose food debris from burner ports with a wooden toothpick or soft cloth. Do not use a drill bit, knife, or anything that enlarges the ports.
- Let the area air-dry fully before reassembly.
Next move: If the clicking stops after drying and cleaning, you had a moisture or debris issue, not a failed part. If the same burner still clicks or keeps sparking after it lights, check cap seating and flame pattern next.
What to conclude: A clean, dry burner should spark normally and stop once the flame is established. If it does not, alignment or a control-side issue is more likely.
Step 3: Reseat the burner cap and watch how the flame lights
A cap that is slightly off-center can cause delayed ignition and nonstop clicking even when the igniter itself is fine.
- Set the burner cap back on carefully and make sure it sits flat in its locating tabs or recess.
- Gently nudge the cap to confirm it does not rock.
- Restore power if you had unplugged or switched off the cooktop circuit for cleaning access.
- Turn on only that burner and watch whether the flame lights quickly and evenly around the ring.
- Listen for whether the clicking stops right after ignition or continues while the flame is already stable.
Next move: If the burner lights quickly and the clicking stops, the cap was misaligned or the flame path was dirty. If the burner lights but keeps clicking, or if clicking starts again with all knobs off, move to the knob and switch check.
Step 4: Check for a sticky knob stem or cooktop burner ignition switch
When a gas cooktop clicks with all knobs off, a sticky switch at one valve stem is one of the strongest clues.
- With the cooktop off, pull off each burner knob one at a time if it is designed to pull straight off.
- Look for grease, cleaner residue, or moisture around the knob stem.
- Wipe the area dry and clean with a barely damp cloth, then dry again.
- Reinstall the knob and turn it on and off a few times to feel for one that binds, drags, or does not return cleanly.
- If one knob clearly changes the clicking when touched or moved, that burner ignition switch area is the likely fault.
Next move: If cleaning and drying the knob stem area stops the clicking, the switch was likely sticking from residue or moisture. If no knob changes the symptom and the cooktop still clicks randomly, the spark module is more likely than a burner-side problem.
Step 5: Replace the failed part only after the pattern is clear
By this point you should know whether you have a burner-side issue, a sticky switch issue, or a likely spark module problem.
- If one burner was the problem and cleaning, drying, and cap seating did not help, inspect that cooktop igniter for a cracked ceramic tip or obvious damage and replace it if confirmed.
- If clicking happens with all knobs off and one knob area clearly affects it, replace that cooktop burner ignition switch.
- If the cooktop is dry, burner caps are seated, switches do not appear to be sticking, and the unit still clicks at multiple burners, replace the cooktop spark module or schedule service if access is not straightforward.
- After any repair, reassemble carefully and test each burner one at a time, then with all knobs off, to confirm the clicking has stopped.
A good result: If the clicking is gone and each burner lights normally, the repair path was correct.
If not: If the cooktop still clicks after the likely part is replaced, stop there and have the unit professionally diagnosed rather than stacking more parts.
What to conclude: The strongest part match comes from the symptom pattern, not from the noise alone. One burner points to the igniter area. All knobs off points to a switch or spark module.
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FAQ
Why does my gas cooktop keep clicking after I clean it?
Usually because moisture got around a burner cap, burner base, or igniter. Even a small amount of water can keep the spark jumping. Let the area dry fully, then reseat the cap and test again.
Is it normal for all burners to click when I turn on one burner?
Yes. Many gas cooktops spark at multiple burners at once when you turn one knob. That is normal during ignition. It is not normal if the clicking keeps going after the burner is lit or continues with all knobs off.
Can a bad burner cap cause constant clicking?
Yes. If the burner cap is crooked, not seated flat, or the flame path is dirty, ignition can be delayed or uneven and the cooktop may keep sparking.
What part usually fails when the cooktop clicks with all knobs off?
A sticky cooktop burner ignition switch is a common cause. If the switch area is dry and clean and no knob affects the symptom, the cooktop spark module becomes more likely.
Can I still use the cooktop if it keeps clicking?
Not until you know why. If it is just a damp burner, the fix may be simple. But if the clicking continues with all knobs off, if a burner will not shut off, or if you smell gas, stop using it and get it checked.
Should I replace the spark module first?
Usually no. Moisture, debris, cap alignment, and sticky knob switches are more common than a failed spark module. Rule those out first so you do not buy the wrong part.