My FBH is switching itself on randomly - usually a couple of minutes after the ignition is switched off and car is locked. I don't know why. The only way to switch it off is to press 'OFF' on the remote. Am very confused. Any ideas?

Thanks.

I'll swap. Mine won't switch on. But no ideas, sorry...  Graham

____
Gone: 10MY L320 RR Sport HSE, Ipanema Sand
Gone: 20MY Jaguar iPace HSE, Silicon Silver
Gone: 17MY RR Evoque SE Tech, Loire Blue
Gone: 08MY Discovery 3 XS, Stornoway Grey
Gone: 07MY FFRR TDV8 Vogue, Stornoway Grey

Thanks haha sounds a plan.

Such a waste of Diesel. I garage my car too and don't want to smoke it out...

Sounds like the car isn't fully going to sleep.

have you checked the times for any programmed switch on's at all?

Autobiography wrote:

My FBH is switching itself on randomly - usually a couple of minutes after the ignition is switched off and car is locked. I don't know why. The only way to switch it off is to press 'OFF' on the remote. Am very confused. Any ideas?

Thanks.

Sorry no idea why, but mine has started doing the same I don't have a remote, but mine turns itself off again after somewhere between 2 and 5 minutes. Doesn't do it every time, but seems to be random..

Hopefully someone will come up with an answer

might sound silly but try taking the batt out of the remote.. it could be faulty and is sending the signal to switch on... its te first thing i would do.. V8 facelift Range Rover Autobiography 22" wheels.
1976 Harley Davidson Iron Head Sportster

How do you manage to switch yours off? If I go into the car when its switched itself back on, on the touch screen 'Manual Heat' is illuminated when its on and all timers are 'Off.' Really confused.

How about swapping them over then getting "mine" fixed on "your" warranty...




Just a thought. Graham

____
Gone: 10MY L320 RR Sport HSE, Ipanema Sand
Gone: 20MY Jaguar iPace HSE, Silicon Silver
Gone: 17MY RR Evoque SE Tech, Loire Blue
Gone: 08MY Discovery 3 XS, Stornoway Grey
Gone: 07MY FFRR TDV8 Vogue, Stornoway Grey

is your engine upto temprature at this point and do you lock the car when you leave it?

Yes up to temperature, FBH comes on once I've locked the car and come back about 2 minutes later to find it chucking out so much hot air!

Have you not asked the dealer to take a look? That's what I'd be doing if mine was a 2011

This is happening because:

You have previously tried to use the FBH from either the remote or the timed screen control, but the cycle didn't complete due to low battery power.
When you then drive, this puts some charge back in the battery. FBH wont operate when engine is running.
When you stop, FBH thinks it needs to complete the cycle, has a look to see if there is enough battery power....you've just driven for a while so there is enough battery power, so the FBH turns itself back on.

Crazy, no? But this is what is happening.

Makes sense. What a joke. I have taken the batteries out the FBH remote and 10 minutes later it switched itself back on. No Low Battery warning though so far.

Rambles, you are sure of this? Confirmed by whom? This would def be an error in the programming of the FBH/ATC ECU. The reason I ask is that, after several years of playing with and researching FBHs, this is the very first time I have ever read this. And even many of the technicians at main dealers don't know poop about the FBH and tend to speak out of their @&%es just to get customers off their lots. Rumors and BS fly heavy and thick on this topic. (see 'Have I gaot a FBH' in the general section).

I think some might be confusing park-heat with the FBH clearing itself after running. The combustion chamber of the FBH must be cleared of all remaining fuel so the combustion air blower (high pitched whine) runs for a period of time after it has been shut down.

If you've driven the RR in the cold and the FBH has come on in its function as an additional heater - and you've not driven long enough to have the FBH shut down during the drive, when you shut off the motor you'll hear the FBH clearing itself for another minute or two. It is no longer burning at this point, just blowing air through the chamber.

Here are the on/off conditions for the FBH as an additional heater.

The ATC ECU activates the additional heating mode when the engine is running and the following conditions coexist:
l The ambient temperature is less than 5 °C (41 °F)
l The engine coolant temperature is less than 75 °C (167 °F)
l The heater coolant temperature is less than 75 °C (167 °F)
l The reference temperature is 100%
l The blower is on.
To activate the additional heating mode, the ATC ECU energises the auxiliary coolant pump and sends K bus
messages to the FBH unit to start/continue operation (the changeover valve remains de-energised).
The ATC ECU stops the FBH and de-energises the auxiliary coolant pump when any of the following occur:
l The engine stops
l The ambient temperature increases to more than 15 °C (59 °F)
l The engine coolant temperature increases to more than 75 °C (167 °F)
l The heater coolant temperature increases to more than 75 °C (167 °F)
l The reference temperature decreases to less than 90%
l The blower is selected off.


And here the 2 functions of the FBH (park heating was/is an option - not standard)


The FBH system operates in two modes:
l Parked heating, to heat the passenger compartment while the vehicle is parked with the engine off
l Additional heating, to boost heater performance while the engine is running
The ATC ECU disables FBH operation if battery voltage is too low.
l When the engine is off the low voltage limit is 11.4 V for more than 10 seconds; the system is re-enabled if battery
voltage increases to 12.2 V
l When the engine is running the low voltage limit varies, with ambient temperature, between 11.1 V at –25 °C and
below and 11.7 V at 15 °C and above; if battery voltage is below the limit for 2 minutes the system is disabled for
the remainder of the ignition cycle.
During FBH operation, with or without the engine running, the coolant valves remain de-energised and heater matrix
temperature is directly related to the temperature of the coolant coming from the FBH unit. 
RRC 2Dr, RRC 4Dr,
P38, and 2 L322s
(wife thinks I'm nuts - prob right, too)

Steve, you seem to be an expert on this unit, any idea where I could get mine repaired? Graham

____
Gone: 10MY L320 RR Sport HSE, Ipanema Sand
Gone: 20MY Jaguar iPace HSE, Silicon Silver
Gone: 17MY RR Evoque SE Tech, Loire Blue
Gone: 08MY Discovery 3 XS, Stornoway Grey
Gone: 07MY FFRR TDV8 Vogue, Stornoway Grey