Thermador burner geometry makes correct seating and a clean ignition path important. Persistent clicking can begin after a spill, cleaning, or an electrical ignition failure. The safest useful observation is whether clicking affects one burner or the entire cooktop and whether gas lights immediately with a normal flame.
Safe checks you can make first
- Shut the controls off if gas does not ignite promptly
- Allow wet burner components to air-dry completely
- Seat user-removable burner parts according to the model guide
- Check visible ports for residue without changing their size
- Note whether clicking follows one knob or every burner
- Stop for yellow lifting flame, delayed ignition, or gas odor
Stop for gas odor, smoke, damaged wiring, active leaks near electrical parts, or repeated breaker trips. Avoid internal gas, refrigerant, or live-voltage work and arrange professional service.
Common causes behind the symptom
Moisture is carrying spark away
Water beneath a burner base or around an electrode can let high voltage travel along the wrong surface.
Burner pieces are misaligned
A small seating error can alter the relationship between gas ports and the electrode, producing repeated clicks before flame appears.
Electrode spark is weak or misplaced
Cracked ceramic, contamination, an incorrect gap, or a damaged lead can prevent a strong spark at the ignition point.
A switch remains electrically active
The ignition switch associated with a valve can stick or short, causing clicking even when the flame is established or controls are off.
Shared ignition electronics have failed
When several positions are affected, grounding, harness connections, or the spark module may be involved.
Use the clicking pattern to guide service
One burner after cleaning suggests a local moisture, seating, or electrode issue. Every burner clicking unexpectedly suggests a shared switch or module path. A burner that lights late must be treated differently from one that lights normally but continues to spark.
Do not repeatedly introduce gas while watching for a spark. Record a short description or safe video from a distance, turn the controls off, and schedule diagnosis when ignition is delayed or the behavior returns after drying.
Integrated cooking appliances need careful access
Thermador rangetops, cooktops, and ranges can place ignition components below sealed surfaces or near finished counters. Service access should protect stone edges, trim, gas connections, and ventilation. The model number identifies the correct burner and ignition design.
Frequently asked questions
Why did clicking start after I cleaned the cooktop?
Moisture may remain around the electrode or beneath a removable burner component, or a part may not be fully seated after cleaning.
Why do multiple Thermador burners spark at once?
Some ignition designs spark multiple electrodes during lighting. Unexpected continuous clicking can still indicate moisture, a switch circuit, wiring, grounding, or the module.
Can I dry the burner with direct heat?
Avoid uncontrolled heat. Let user-removable pieces air-dry and follow the appliance use guide; direct heat can damage finishes, seals, and ignition components.
When is clicking an emergency?
Turn the appliance off for unburned gas, delayed ignition, flash ignition, abnormal flame, smoke, or clicking that continues with controls off. Follow utility guidance for persistent gas odor.
Ghost Appliance Repair is an independent service company and is not affiliated with or endorsed by Thermador or its manufacturer.