Being a fairly new TDV8 owner ( Nov 2012), it took a while to realise that the pre heater wasn't working. So after searching in this forum, I read up all about how to reset it but had decided that i would get all the parts I needed later on, make up the lead and reset it in time for winter. However, 05:30 yesterday morning as my wife reversed of the drive it was working , tell tale smoke screen. How the hell has this happened. She even noticed the difference in heater temp on her way to work. Now I know that last winter the car was stop start halve a dozen times at least on one day before going to the petrol station with the diesel light on so it must have been locked out. I had it serviced last month would they have reset it as par for course or not. any ideas would be gratefully appretiated.  07 tdv8 stornoway grey at home tucked up
x type jag work and back hack
x5 Gone - never fully loved or cared for
Disco td5 gone - saved a fortune on ear plugs
Freelander gone - one of the first and worst
early disco gone- A tractor in a fur coat.

low fuel light will disable the FBH and the temp hs to be lower than 5 degrees also.

Maybe a combination of both? RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

awd man wrote:

low fuel light will disable the FBH and the temp hs to be lower than 5 degrees also.

Maybe a combination of both?

And the heater has to be switched on

The heater is automatic, no switches there..

It will start automatically, when the "snowflake"
appears in the info screen..

Probably the service somehow resetted the
FBH (Fuel Burning Heater)..

Happy for You that it works now anyhow.

I have a remote-controller for my FBH, bought from
Pete at BellAutoServices..
Easy to install, and You can reset, and start the FBH
whenever You like, can "warmly" recommend that thing..

Rgds

Uffe As a rule, I always resist temptations,
unless they are irresistible.
My Ride: 2006 RRS HSE TVD6 Java Black/Cherry Woods with HST factoryfitted pack.

I mean the interior heater in the car, not the FBH

If the car was serviced by a main dealer and they did the service correctly any software updates will have been be installed, before these updates are installed all error codes are deleted, these error codes could have not been allowing the FBH to start.