Thermador Gas Cooktop Making Noise: Separate Normal Clicking From a Fault

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Turn all burner knobs fully off and classify the sound before trying another ignition.

   Expected result: Note whether the click occurs only during normal ignition, repeats at a low ExtraLow setting, continues when every knob is off, or is accompanied by a hiss, gas odor, pop, smoke, or an abnormal flame.

   Next step: If there is persistent odor or hissing, smoke, fire, or a loud abnormal pop, stop here, leave the area as appropriate, avoid flames and switches, and follow local gas-emergency guidance. Otherwise continue with the matching low-risk check.

   Stop if: Do not keep relighting a burner to identify a noise when gas odor or an uncontrolled or abnormal flame is present.

   Why this matters

   Why: A short ignition click or the documented ExtraLow on/off cycle can be normal. A persistent click with the controls off, a gas-like hiss, delayed ignition, or an abnormal flame is not a routine operating sound.

2. Check 2

   Check whether the sound matches the ExtraLow burner cycle rather than an ignition attempt.

   Expected result: With no gas odor and a stable, correctly lit low flame, observe from the normal user position whether the low setting periodically turns the flame down or off and then restores it, with a click associated with that cycle.

   Next step: If the sound is periodic and only occurs with ExtraLow cycling, use the setting normally. If the sound is continuous, occurs at other settings, or continues after the burner is off, turn the knob off and inspect only after the surface cools.

   Stop if: Stop using the burner if the flame does not remain controlled, ignition is delayed, or the cycle is accompanied by gas odor, a pop, or smoke.

   Why this matters

   Why: Thermador describes automatic flame cycling within ExtraLow as normal; a periodic click linked to that cycling is different from continuous sparking or a click while the control is off.

3. Check 3

   After the cooktop is completely cool, verify the burner cap is seated on its locating tabs and not visibly tilted.

   Expected result: The cap should sit level in its intended position, with the locating tabs aligned to the burner base; a cap moved during cleaning or a spill may sit off-center.

   Next step: With the gas control off, reposition only the loose top cap so its tabs meet the matching notches. Do not remove or adjust the burner base, regulator, injector, or gas tubing. If the cap cannot sit level or the noise remains, stop using that burner and request service.

   Stop if: Do not force a cap, run the burner with parts missing, or proceed to gas-path disassembly.

   Why this matters

   Why: Thermador lists cap position as a cause of ignition difficulty, uneven flame, and persistent clicking. A visibly displaced cap can prevent the gas-air mixture from lighting cleanly.

4. Check 4

   Look for spill moisture or debris around the burner ports and igniter, then clean and dry the accessible top surface.

   Expected result: After a boil-over or cleaning, moisture may remain around the igniter, and the burner ports may look damp or blocked. The igniter should be free of lint and excess water; ports should remain open without gouges.

   Next step: When completely cool and off, wash the cap with hot soapy water and a soft cloth, use a soft nylon brush for accessible ports without scratching them, and wipe the igniter with a damp cotton swab followed by thorough drying. If debris cannot be removed without probing or disassembly, stop and call service.

   Stop if: Do not use a metal pick, flood the burner base, use flammable cleaner, or operate while the igniter or ports are wet.

   Why this matters

   Why: Thermador identifies damp igniters and wet or clogged ports as causes of repeated clicking or intermittent sparking. Moisture can also make ignition uneven until it has fully dried.

5. Check 5

   Once the surface is fully dry and the cap is seated, check for an external draft only from the normal operating position.

   Expected result: A strong hood draft, open window, or other air movement can disturb a flame or make ignition intermittent; the flame should light promptly and remain steady without repeated sparking.

   Next step: Reduce an obvious external draft without blocking required ventilation, then make one normal ignition attempt only if there is no odor or other warning sign. If the sound or flame problem persists, turn the knob off and arrange qualified service.

   Stop if: Do not shield a burner with objects, repeatedly cycle the ignition, or test through a gas odor, pop, smoke, or unstable flame.

   Why this matters

   Why: Thermador notes that air movement can contribute to persistent clicking or flame behavior. A controlled flame after the draft is reduced points to airflow; continued sparking or an uneven flame does not become safe merely because a draft is present.

6. Check 6

   If clicking continues after the knob is released, stop testing and record the affected burner and conditions for a technician.

   Expected result: The ignition may continue to spark with the control off, or the issue may be limited to one burner versus several burners; note whether it began after cleaning, a spill, or a power interruption.

   Next step: Leave the affected control off, do not open the cooktop or gas supply components, and request an authorized appliance or gas service visit. If gas odor or hissing is also present, follow the urgent gas-safety branch instead of waiting for routine troubleshooting.

   Stop if: Do not continue operation or perform live electrical work to isolate the ignition circuit.

   Why this matters

   Why: Thermador associates persistent clicking or sparking with cap position, wet or blocked ports, damp igniters, drafts, gas supply state, or a control position. If a cool, clean, dry, correctly seated burner still sparks, the remaining possibilities require trained diagnosis.