I thought I would give my FBH a go for the first time a few days ago out of curiosity having never had this feature before and because it was the first slightly chilly day. The remote worked fine and the fans started to run but no heat to the cabin. What does the ambient temperature have to be below for it to heat rather than just ventilate? I have looked in the manual and it doesn't say. I am not sure if it was not cold enough or if it is not working properly.

there is FBH info in our wiki and did you have the heat turned 'on' .. ... - .- -.




Y. O. L. O.
.

The wiki does not have the answer. The heating was on in the respect that it was set at 20 degrees and was on Auto.

So it seems that the temperature has to be set at a higher level on the dash. I put it up to 24 degrees today and gave it a go. Toasty warm in no time. I am quite impressed having never had this feature before (it has never been standard fit on my previous S/Cs). However I don't understand why the temperature needs to be set higher than you would normally have it set. It's a bit of a nuisance if I have to remember to bump up the temperature dial everytime I leave the car in case the next time I use it I want the FBH on beforehand. If the actual cabin temp is below the selected temp logically it should heat to that selected temp whatever it is? Has anyone else experienced this?

TIMED CLIMATE CONTROL OPERATION

When the ATCM receives a timed climate control start request, its response depends on the ambient air temperature:

If the ambient temperature is 16 °C (61 °F) or more, the ATCM initiates parked ventilation and:
Operates the blower at 47% of maximum speed.
Operates the distribution doors in the heater assembly to direct the air to the face level outlets.
If the ambient temperature is less than 16 °C (61 °F) and more than -20 °C (-4 °F), the ATCM initiates parked heating and:
Energizes the changeover valve.
Sends a LIN bus message to activate the FFBH.
Operates the blower at 47% of the maximum speed.
Operates the distribution doors in the heater assembly to direct the air to the footwells for approximately 30 seconds, then to either only the windscreen, or to both the footwells and the windscreen, depending on the ambient air temperature.
If the ambient temperature is -20 °C (-4 °F) or below, the ATCM sends a LIN bus message to activate the FFBH, but leaves the changeover valve de-energized and does not operate the blower or distribution doors. Heated coolant is circulated around the engine and heater core(s) to heat the engine and improve engine starting. Once the FFBH coolant temperature is above a suitable threshold the blower is switched on and passenger compartment heating commenced.
The FFBH will only activate in timed climate control if the following threshold conditions are met:

Pre-burn battery voltage check: ≥11.5V (voltage at FFBH terminals).
Pre-burn coolant temperature check: ≤15°C (internal FFBH measurement).
Pre-burn fuel level check: ≥7.5 liters (value stored in FFBH at ignition off).
The fuel level value stored within the FFBH is only updated when the engine is running. When starting the FFBH in timed climate control with the engine off, the fuel level value used in the FFBH calculations will be that stored at the ignition off event. It is therefore possible for the FFBH to fail to operate in timed climate control if the engine was stopped with a low fuel level; if the fuel tank is subsequently refueled, the FFBH stored fuel level will still read low if the engine has not been started since refueling.

After 30 minutes, or if timed climate control is selected off with the touch screen or remote control, the ATCM discontinues timed climate control operation:

If parked ventilation is active, the ATCM:
Switches off the blower.
Returns the distribution doors to the previous settings.
If parked heating is active, the ATCM:
Sends a LIN bus message to de-activate the FFBH.
Switches off the blower.
Returns the distribution doors to the previous settings.
After 3 minutes, de-energizes the changeover valve.
TRANSITION FROM TIMED CLIMATE CONTROL TO ENGINE RUNNING

Parked ventilation is automatically de-activated when the ignition is switched on.

Parked heating:

Is de-activated when the engine starts if the engine coolant temperature is equal to or more than the heater coolant temperature.
If the engine coolant temperature is less than the heater coolant temperature, parked heating remains active until the engine coolant temperature reaches the heater coolant temperature. The changeover valve also remains closed until the engine coolant temperature reaches the heater coolant temperature.

Wow - that is some explanation - where did you find that immense level of detail? I have to say that I now understand a great deal more than I did and several things I have noticed now make sense - shame most Land Rover Dealer technicians don't have the same level of knowledge:)

So impressed with CubaLibre info I forgot to ask a question - I have to operate the remote transmitter almost touching the car before it will activate the remote heating. The remote has been changed and has been fitted with new batteries but with no improvement - any one else had this problem yet?

The remote for mine works from any room in the house.

The only problem I've got at the minute is the alarm going off every time I use the FBH but only when the vehicle is DOUBLE locked.
Main battery all tested normal too.

At least you hear when yours is working

Mark L wrote:

The remote for mine works from any room in the house.

The only problem I've got at the minute is the alarm going off every time I use the FBH but only when the vehicle is DOUBLE locked.
Main battery all tested normal too.

Worth every penny these, good uk build quality. it's just not funny.

Anyone know what it looks like under the bonnet?

My build sheet says I have it, but I don't have the fob?

You can set the FBH timer from the main screen if you don't have a fob. If it's not on the screen then their is a fair chance it isn't fitted. MY23 D350 HSE
On my 7th RR plus various other JLR vehicles

Where is it on the screen?

Mark

There is a software update so that the FBH doesn't activate the alarm when double locked...

wealy wrote:

Where is it on the screen?