This is what the iid manual says:-
4.7.5 Fuel Burning/Auxiliary Heater (L322-10, L319, L320)
Fuel Priming
This routine will remove air from the system (if present) replacing it with fuel.
Check Operation
This routine will activate the fuel burning/auxiliary heater regardless of the ambient and engine
tem- peratures. This routine will begin by clearing faults stored in the ECU. If the routine fails,
proceed with a read fault and fix the issue.
Usage
These functions are useful to get the system up and running after a long period of inactivity, when
replacing the unit or simply to diagnose a problem. 2011 4.4 TDV8 Vogue SE
1993 Discovery 1 3.5 V8i
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