Member Since: 01 Mar 2020
Location: Stoke-on-Trent
Posts: 55
FBH ticking but no startup sequence???
So I've fitted a FBH controller and had it working using GSM for over a week. However, I noticed that on a couple of occasions it wouldn't start and I had to reset by pulling the FBH fuse (28 I think). Based on this and the smokey starts I thought I'll take the unit off and strip it down for a decoking, new gasket and seals.
I put the unit back and it started up and fired for about a minute then shut down. I have since pulled the fuse but the unit will only make a 'ticking' noise, no pump or fan?
Could it be that the unit only burnt the little bit of fuel that was left in the hose and now has air trapped and needs to be bled, is it not self bleeding?
Why would the startup sequence not even initiate, the only noise is a ticking sound? I'm scratching my head on this one.
15th Feb 2021 9:01 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
Quite simple....
The ecu or control unit on the webasto does a preliminary check of all of the needed components
If one is faulty or bad connected...it does not initiate startup...
Since the fan is not even start in this preliminary stage... the fault can be in that “corner”...
Can not be fuel in this stage
If there is air in the fuel line.. it would start up normally fan blows.. including starting up the dosingpump... but cut then out, because it is not starts to burn...
Other symptoms there
Stay away from priming for now... makes things worse most of the time...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.
16th Feb 2021 12:01 am
itguy
Member Since: 30 Dec 2009
Location: Melton Mowbray, Leics
Posts: 181
Could it be that the FBH didn’t have coolant in it and the unit has locked itself out from an overheat event?
Did you run the engine / add coolant / bleed coolant / run the FBH coolant pump at all before you fired it up?
16th Feb 2021 6:42 am
Yozza
Member Since: 01 Mar 2020
Location: Stoke-on-Trent
Posts: 55
Thanks fellas, I fired it up after topping coolant up but I’m not convinced the coolant made its way into the FBH. After it refused to start I did run the engine and bleed, however, it’s still not initiating the startup sequence.
When it’s not fired up before a pulled fuse normally did the trick. Why won’t that work now? Are there different lock-out levels?
16th Feb 2021 3:53 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
Pulling a fuse is not a solution in itself...
It only goes in lock when there is something wrong....
When the real problem is cured, then Erasing the errors can be necessary to get it it startup again..
(If temp is 8 degrees celcius or higher and the tank full)
Either pulling a fuse (technically take the current off) or by software...
But still cure the real mechanical error first.....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.
16th Feb 2021 4:12 pm
Yozza
Member Since: 01 Mar 2020
Location: Stoke-on-Trent
Posts: 55
Finally got a few minutes to have another look. As I can only hear a clicking sound from the FBH unit and no fan start I checked fuel delivery. I pulled the flexi fuel pip off the rigid pipe at the FBH and no fuel. I then crawled underneath to check if the dosing pump was making a pulsing/clicking sound - nothing. I pulled the connector off and gave it a spray with contact cleaner but to no avail. Frustratingly I noticed the plastic undertray hasn't been fitted after it's last service exposing the 'sensitive under-carriage'.
How can I check if the fault lies with the pump or the controller itself (is it possible to get a copy of the webasto diagnosis software)?
Cheers,
Y
7th Mar 2021 9:47 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Have you read the cars fault codes?
7th Mar 2021 11:04 am
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
Buy a diagnostic cable from the shop and download the free software from Webasto.
As Harold has already stated if the fan is not making a noise its most likely that, that has failedAndrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
7th Mar 2021 11:08 am
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
@ yozza, so you did not read my post.....
or you do not believe me...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.
7th Mar 2021 1:24 pm
Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820
Motolab wrote:
Quite simple....
The ecu or control unit on the webasto does a preliminary check of all of the needed components
If one is faulty or bad connected...it does not initiate startup...
so THE fuel dosing pump DOES not EVEN start
Since the fan is not even start in this preliminary stage... the fault can be in that “corner”...
Can not be fuel in this stage!!!!!!
If there is air in the fuel line.. it would start up normally fan blows.. including starting up the dosingpump... but cut then out, because it is not starts to burn...
Other symptoms there
Stay away from priming for now... makes things worse most of the time...
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.
7th Mar 2021 1:27 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5053
Yozza wrote:
As I can only hear a clicking sound from the FBH unit and no fan start I checked fuel delivery. I pulled the flexi fuel pip off the rigid pipe at the FBH and no fuel. I then crawled underneath to check if the dosing pump was making a pulsing/clicking sound - nothing.
Cheers,
Y
You will not hear the fuel pump initially as delivery does not begin until later in the start up sequence!
You should hear the fan spool up as the burner goes through it's component tests. Once all the tests are completed and without the presence of a fault, only then will the fuel pump be permitted to run!
If there is a fault detected, fuel will not be delivered.
It does sound like you may have a fan related issue, so Webasto WTT diagnostics using the adapter kit available from the shop will pin point the fault.
PS Pay attention to Motolab's comments, he has and eaten these for breakfast over many years yµ (idµ - eAµ) ψ=mψ
7th Mar 2021 1:33 pm
Yozza
Member Since: 01 Mar 2020
Location: Stoke-on-Trent
Posts: 55
Apologies fellas, I am now paying attention. I'll heed your sound advice, and look at buying the interface cable and download the software.
7th Mar 2021 8:11 pm
Yozza
Member Since: 01 Mar 2020
Location: Stoke-on-Trent
Posts: 55
Back up and running after clearing the fault codes. Great piece of Webasto software and supporting information on here!
Thanks
Fellas!
Y
20th Mar 2021 7:13 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5053
Well done for sorting it yourself yµ (idµ - eAµ) ψ=mψ
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