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The overheat sensor or flame sensor (also referred to as the combi-sensor) for the Airtronic D2 and D4 heaters. This sensor monitors heater start up and the temperature of the heat exchanger.
* Fits heater models: Airtronic D2 (25.2069.05, 25.2070.05), Airtronic D4 (25.2113.05, 25.2114.05)** Please call to confirm the correct part number for older models of heaters.