L322 Aux heater not working - something not connected?

Hi all,

Its just dropped cold enough for me to test the aux heater on my RR. So I've pressed the manual start, the blower starts for a few minutes and then nothing. I expected the FBH to kick in, but there not noise of fuel pumping or anything.

I looked under the bonnet to see if I could see anything obvious and I found the plug in the attached pic just hanging loose. I'm sure this is not a design feature so wondered if anyone could tell me if it's to do with the FBH and where it should go?

I will then address the issue why is was unplugged, guessing a fault somewhere but will see.

Cheers
Chris

Well I can see its a td6, not sure about the plug would have a look at mine but its dark and cold out there right now ( -2c just now) will have a look tomorrow some time. The fbh will kick in when you start the engine to help get the engine up to temp if its cold enough, not sure what you mean by manual start though I have had the aux vent and heat enabled on mine so I could set the timer for the fbh to come on at a preset time if I so wish, just had another look at the fuel filter/cooler pic and think maybe seen a spare plug like that on mine.

Thanks for the reply. Will take another look later and see if I can figure it out. When I say Manual start, mines the touch screen version, so on the head unit, I click on the top left button I get the options to set the timer for the FBH, there is also a "Manual" button there, which should start the FBH manually. When I click it, the blowers start, but stop after a few mins, and no FBH kicks in. I've checked the boot and there is a receiver for the FBH but I don't have a remote, I might buy a remote off eBay and see if this works instead.

Walshie1987 said:

Thanks for the reply. Will take another look later and see if I can figure it out. When I say Manual start, mines the touch screen version, so on the head unit, I click on the top left button I get the options to set the timer for the FBH, there is also a "Manual" button there, which should start the FBH manually. When I click it, the blowers start, but stop after a few mins, and no FBH kicks in. I've checked the boot and there is a receiver for the FBH but I don't have a remote, I might buy a remote off eBay and see if this works instead.

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I may be wrong but using the remote will have the same result as using the manual start.

+1. my remote does exactly the same as the button, SOD ALL, but then my FBH don't work either.

haha yeah the remote was a long shot, just wanted a new toy .....but pointless until I can get the FBH working

I've just realized that I don't really know what I'm looking for under the bonnet Am i correct in thinking that the part circled in the pic is the FBH. Got a feeling I've been looking in totally the wrong place!!

I believe it's under the battery.

100% Thanks (link here for future ref: https://workshop-manuals.com/landro...lation/repairs/fuel_burning_heater_(fbh)_td6/

Just a thought, but I thought I'd seen that it will switch itself off if the battery drops below a certain voltage. Great because the battery level will drop in cold weather.

Good point. Probably doesn't help that I only do 3miles a day in the RR (to and from work 1.5m each way) so battery won't be getting topped up much at all.

You could try starting the engine from cold let it tick over for couple of minutes which should give the fbh time to kick into life then switch off and go and stand next to front passenger wing, you should hear the fbh running down which would prove its working, mine runs for a minute or two after switch off

kds said:

You could try starting the engine from cold let it tick over for couple of minutes which should give the fbh time to kick into life then switch off and go and stand next to front passenger wing, you should hear the fbh running down which would prove its working, mine runs for a minute or two after switch off

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Not sure if this is 100% proof it's working, My fan carried on running after switching the engine off even though the FBH doesn't work. Of course it may not have been the FBH fan running but since removing the FBH fuse it no longer happens.

There is a fuse of in the cabin for the FBH, open to glovebox pull it down as far as it will go there is a little fuse box behind the little cover that Pulls down,

I think it's under 'auxiliary heater'. Check the fuse.

When the FBH is running in the cabin with the engine ticking over, over the passenger side if the car you should hear a faint 'tick tick ticking'. This is the fuel on its way to the FBH. You will definitely hear it running, they aren't the quietest of things.

HTH.

Sorry blackinblack. Just read you already pulled the fuse, it's been a long day ........ !!!

@robhew86 no problem. I was getting a bit of battery drain hence fuse removal. Would love a working FBH but far too cold to fix it

backinblack said:

@robhew86 no problem. I was getting a bit of battery drain hence fuse removal. Would love a working FBH but far too cold to fix it

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Too cold ! Its been 10c all day here, summer weather nearly lol. So next warm day then its wheel off wheel arch liner out to get at it.

there's a few other jobs before my FBH gets looked at.

backinblack said:

there's a few other jobs before my FBH gets looked at.

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I wouldn't worry, the way the politicians are going your FBH will be banned soon or else they will want to tax it