If the interior heater is completely switched OFF, can someone confirm whether their FBH starts up when the air temperature is below 5 deg and the engine is cold (so that the engine reaches its correct operating temperature asap). Mine only works when the interior heating is switched on to Economy or aircon, which seems a bit daft as this only lengthens the time the engine takes to warm up.

Can someone please check this out before the warmer weather comes? Gone - 2008 TDV8, Stornoway Grey, ebony, zabrano trim, TV, Tasmods, mudflaps.

We don't have the FFBH here but I would agree with you.

Quote:

While the engine is running, if the ambient air temperature is less than 9 °C (48 °F) and the ECT (engine coolant temperature) is less than 75 °C (167 °F) the ATC (automatic temperature control) module changes the status message from 'heater off' to 'supplemental heat'. The control module then changes the status message it sends the ATC (automatic temperature control) module to 'supplemental heat' and starts the FFBH.

The Control Module controls and monitors operation of the FFBH.

What this has got to do with the interior switches is baffling.  Malaysia Boleh!
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Thanks Bobby

Can someone, with the Fuel Burning Heater fitted, check this out for me please - whilst the weather is still cold. Gone - 2008 TDV8, Stornoway Grey, ebony, zabrano trim, TV, Tasmods, mudflaps.

The FBH is referred to in the RRS manual under the section Heating and Ventilation and I think (memory may be wrong) that when I had a Freelander 2, the manual clearly claimed the FBH was there to improve in cabin heating for diesel engine that are slow to warm up.

I have always thought that with RRS it is the same but the wording in the manual could be better and, therefore, makes sense on the heating controls.

FBH is only there to assist the engine warming when external temp is below +5 degrees. It starts automatically when vehicle is started . The knock on effect is that the cabin will heat up slightly quicker as well, when heater is on !

You can not turn the FBH on manualy it is external temp and engine sensed. i.e. cold engine and o/s temp +5 or below. It will turn itself off once engine heats up. Your internal heater control should have nothing to do with it.

If you have the Park Heat option then you can turn it on manualy but this is an option on 10MY cars. Discussed in length here http://www.rrsport.co.uk/forum/topic16407.html?highlight=fbh  MY10 TDV6 HSE, Alaska White, Ebony with Contrast, Park Heat, Paddle Shift, Privacy, Heated Steering Wheel, Extended & Premium Leather,

MY07 TDV6 HSE, Zermatt Silver, Gone

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1964 Austin Healey 3000

2007 LR Defender

2011 VW Tiguan R Line

Bobby wrote:

We don't have the FFBH here but I would agree with you.

Quote:

While the engine is running, if the ambient air temperature is less than 9 °C (48 °F) and the ECT (engine coolant temperature) is less than 75 °C (167 °F) the ATC (automatic temperature control) module changes the status message from 'heater off' to 'supplemental heat'. The control module then changes the status message it sends the ATC (automatic temperature control) module to 'supplemental heat' and starts the FFBH.

The Control Module controls and monitors operation of the FFBH.

What this has got to do with the interior switches is baffling.

All of these responses still don't answer my initial question.

Presuming that the maximum air and water conditions are met, is the FFBH supposed to start up and get the engine up to its operating temperature WITH the interior cabin heater controls all switched OFF?

The only way to find out is to go out and try it whilst the engine is cold and the air temperature is below 5 deg. Press the cabin heater switch marked 'off' with the ignition on, BUT prior to starting the engine. When you start the engine the FFBH should start up almost immediately. Mine will only start with the cabin heater switched on and then blasts cold air throughout the cabin due to the engine coolant being cold. Gone - 2008 TDV8, Stornoway Grey, ebony, zabrano trim, TV, Tasmods, mudflaps.

rrsjo wrote:

All of these responses still don't answer my initial question.

Quote:

In some markets diesel models have auxiliary heating provided by a FFBH, which boosts the temperature of the engine coolant supplied to the vehicle heater assembly. Fuel for the FFBH is taken from the vehicle fuel tank, through a fuel line attached to the fuel pump module. In the FFBH, the fuel is burned and the resultant heat output is used to heat the engine coolant. The FFBH system supplements vehicle heater performance while the engine is running, and is transparent to the driver.

I'm surprised nobody on here has taken the trouble to check this issue on their RRS?  Malaysia Boleh!
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Tasmod's Sills, Wind Deflectors, LR Sills
Clear Side Repeaters, Towbar
Larini Sports Exhaust, K&N Air Filter
______________________________
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Tested my 07MY TdV8 two days running from a cold start with 1deg C ambient temperature both days. With heating switched to OFF no FBH activity.

I didn't realise this and am delighted as it always frustrates me that whenever I move our old Freelander I can't prevent the FBH going through it's full start up and shutdown/purge procedure. Still at least I can start that FBH either remotely or via the timer to get a warm cabin.

Bob, I have the same with the RRS if I want to move it off the drive to get my Defender out. This is something worth knowing from that point of view and should help cut out some extra fuel consumption and keep a green happier! Do you know if it still comes on if you press the "Prog" button on a cold morning with the other ventilation off? 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Bob

Thanks for going out and trying this.

Seems to confirm that, as standard, the FFBH will only start if the cabin heater controls are not switched off. It still doesn't seem the quickest way to get the engine up to temp. Instead the FFBH should be be used to the get the engine up to temperature as quick as possible to minimise engine wear, instead of using some of its heat to provide warmth to the cars interior. Gone - 2008 TDV8, Stornoway Grey, ebony, zabrano trim, TV, Tasmods, mudflaps.

Quote:

Do you know if it still comes on if you press the "Prog" button on a cold morning with the other ventilation off?