Fuel Fired Booster Heater (G2257926): Operation: Shutdown
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
To stop the Fuel Fired Booster Heater (FFBH), the FFBHCM de-energizes the FFBH fuel pump to stop combustion, but continues operation of the combustion air fan and the coolant pump for a time, to cool down the FFBH. The cool down time is approximately 90 (diesel vehicles) or 120 (petrol vehicles) seconds.