THERMADOR PROFESSIONAL SERIES RANGE (XLO MODELS) Lock
System Nominal
The symptom described is the intended engineering behavior of the Thermador ExtraLow (XLO) simmer system. The range uses a pulse-spark ignition system that cycles the burner on and off to maintain precise, low-BTU heat; the 'clicking' is the ignition phase, and the 'Lock' is the successful detection of the flame via ion sensing, which tells the spark module to stop firing.
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