Volvo VNL 780 Operator's Manual page 398

388 OPERATION
If the regeneration process is not delayed, the regeneration process starts, the DPF
Regeneration Request icon turns off and the High Exhaust System Temperature (HEST)
icon may illuminate. The HEST icon is shown only at low speeds and elevated exhaust
temperatures. It will go out when the exhaust temperature goes below its threshold or
the truck increases speed above speed threshold. For parked regenerations, the icon is
illuminated during the regeneration process.
W3028766
High Exhaust System Temperature
CAUTION
If the vehicle is in a location that may be
hazardous when regeneration begins (i.e.,
in close proximity to flammable materials
or gases, inside tunnels, parked under
flammable objects, etc.), the regeneration
should be stopped. If regeneration is
stopped by the vehicle operator, it must be
initiated at a later time when the vehicle is
in a safe location. Regenerations that are
stopped and never restarted at a later time,
however, will require that the vehicle be
taken to an authorized Volvo Truck dealer
to have the regeneration manually started
with special service tools.