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DISCO3.CO.UK > Webasto Fuel Burning Heater

D3 FBH not firing up... next steps?
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3
D3 FBH not firing up... next steps?

Hi Everyone

I’ve done quite a bit of reading and just wanted to check my next steps.

The FBH isn’t starting up in my D3 and I can’t hear it making any attempt either.

I have tried taking out fuse 28 (engine compartment) and waiting 5 mins, reinserting and trying again - but no joy.

The temperature is 1c on the dashboard, the engine/coolant is cold and it has 1/2 tank diesel in it.

I don’t have IID at the moment but have got the club webasto diagnostic cable on order, so hopefully I can find out what is happening.

Is there anything else I can do in the meantime over the next few days while I wait for delivery?

I wondered if there is a way I can see if the webasto is being told to fire somehow with a multimeter maybe?

Cheers

Will.  
Post #22087237th Feb 2021 5:07 pm
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Top the fuel tank up to full, charge battery... should be 12,6v

Check wiring of the unit... and fuel pump...

If there is no startup attempt at all (how do you know?) its rather difficult to hear with the engine running... and all connections are ok...and you did a fuse reset... (check the car diagnostics first!) there something essential wrong, since the software does a component check first... before it starts up....

If it is just cloaked or dirty, you do hear it running first! So no sound at all.... just a clean will not help you out... Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink  
Post #22087357th Feb 2021 5:33 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13033

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

Battery voltage ?

The reading the Altox has seems to be same as seen via secret menu, which may differ from that measured across the battery terminals. .


Dean
====================================

2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer Sad ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms  
Post #22087367th Feb 2021 5:35 pm
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Motolab wrote:
Top the fuel tank up to full, charge battery... should be 12,6v

Check wiring of the unit... and fuel pump...


Thanks - how important is a full tank? Just wondered, not arguing.

Battery - good point, will check it. If the battery is below 12.6v engine off, but above 12.6v with running (ie alternator charging), does that mean it’s ok? Haven’t tested it yet so don’t know what it will say.

Fuel pump - where about’s is it?  
Post #22087387th Feb 2021 5:43 pm
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Motolab wrote:

If there is no startup attempt at all (how do you know?) its rather difficult to hear with the engine running...


I tried listening for it specifically, and then had my hand on it feeling for anything happening - plus the exhaust on it was stone cold.  
Post #22087407th Feb 2021 5:44 pm
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

The car, measures the fuel level, and if it is to low.. the FBH will not start... at all...

Since “half full” on the dail can differ from reality, i would suggest for fault finding, to exlude low fuel level, that is why is advice you to top it up...

Regarding noise.. it is important to know for diagnose direction without software, if the startup sequence is “normal” (starts to whine and dies afterwards) or does nothing at all... Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink  
Post #22087617th Feb 2021 6:17 pm
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Thanks very much. I have to go out tomorrow I think so I can fill it up and then try and listen a bit more.  
Post #22087857th Feb 2021 7:10 pm
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Lee Trinder
 


Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 516

2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Could be wrong but have you got your cabin heater on whilst testing, I was under the impression it only comes on so when it is.  
Post #22087867th Feb 2021 7:19 pm
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Yes, cabin heater set to auto (both dots on) and not in eco mode.  
Post #22087907th Feb 2021 7:27 pm
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itguy
 


Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181

2006 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Ok - have now got the diagnostic cable and had a quick look yesterday.

I started with a clearing of all the codes and reset then set it to supplementary heat mode.

Managed to get it to run but then it faulted with an 02h code.

It did run for about 2 or 3 minutes on it’s own before shutting down, so I am wondering if I just try a bit of brake / carb cleaner in the air intake and try to keep running it.

It feels like it needs a few nice long burns. The smoke when it first started up was incredible!

We then had to go out, but I did notice after we’d switched the car off for about 15 mins when we were out, the heater did start itself when I restarted the car - so at least the vehicle to FBH communication is ok.

I did run a few tests in the software too - fuel pump prime (for a very short period of time), heard the tick tick tick ok, then the combustion fan test which worked fine.

Is there anything else anyone would recommend before I try to run it again?

Glow plug test? I do have an airline too, so wondered about giving it a bit more air, but wasn’t sure how much ??

Adjusting the co2 settings?

Didn’t want to do too many things at once so I lose track of what is making a difference.

Thanks  
Post #220960111th Feb 2021 7:00 am
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

No do not spray Carb cleaner into the FBH !

You need to follow the guides to strip and clean your FBH there is obviously a problem with it, messing around can make it worse.
Strip the burner unit down and check the condition of the burner cup if its failed you will need a new burner unit. Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE  
Post #220962011th Feb 2021 8:29 am
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

@ITGUY

how many topics (or "calls"in your world Wink ) regarding the same topic tour FBH.. is effective?`

i did give your advice in another regarding same topic, so please have read there, and my tip, keep in centrelized.. ... otherwise not effective imho.. Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink  
Post #220963411th Feb 2021 9:19 am
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