 | Home > Technical > Thermo Top Webasto problems |
 
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6482   
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Can you get to the 6 pin plug to get diagnostics on it?
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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8th Dec 2020 2:59pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687 
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not without removing the unit or taking the wing off...... Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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8th Dec 2020 3:18pm |
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| Gillan Member Since: 01 Apr 2016 Location: Sheffield Posts: 35 
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I had a similar problem with my thermo top on the range rover it turned out to be the glowpin which I think from memory is dual purpose it reads that the burners fired and preheats the diesel hope this helps
Gillan |
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8th Dec 2020 7:11pm |
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| Badger110 Member Since: 06 Feb 2018 Location: South hams Posts: 1025 
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That sucks
From what you say, it's not igniting, but i think you're already thinking along those lines as without ignition, it will power down. Your fuel feed is from the main tank if i remember, can you check for air in the line? I'd be looking at fuel related issues before removing the unit. I would remove the pipe from the exit side of the fuel pump when starting to check for air in the line. If no fuel is coming through then it's a possibility or it's a fuel pump failure. I have a spare pump if you want to try that, it's old but works, just holler and i'll drop it in a jiffy bag to you |
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8th Dec 2020 7:44pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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Thank you for replies.
I am on the verge of ripping it out but will certainly check fuel line. Yes its from pickup dropped in from top of tank, Looked today all joints look good and couldn't see any air bubbles in the line. Can't get to connection on unit with it fitted. Also thinking fuel filter issue possibly. Is there a filter in the unit? Will check pump end and look at pulling pipe as suggested. Thank you all. Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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8th Dec 2020 8:11pm |
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| Andrew james Member Since: 02 Jan 2013 Location: Awliscombe Posts: 88 
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James,
The fuel pump won't pump against pressure. If you have a blockage in the fuel line after the pump, it will start up, click a few times ( or may not click at all) then shut down. It may be that after a few months of not using the heater, a blockage has occurred and you need to clear the line. You can see if the pump works by disconnecting the fuel line after the pump, from the pump. If the pump then works you know the fuel line is blocked and needs clearing out. Hope that helps, Andrew |
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8th Dec 2020 8:53pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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Cheers Andrew. will check fuel line. Pump clicks and seems to supply fuel but as yet not split the line to check. it worked perfectly daily for the week leading upto the failure. in fact it been in every other day use since Sept, but fuel blockage/pump issue looks like only thing to check or can be checked really. Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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9th Dec 2020 9:31am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 576  
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You can measure current draw and compare it to specifications. Glow plug takes quite a large current during start of fire in the heater.
With working glow plug and with fuel you have probably blocked the burning chamber. I had simillar problem with Webasto AirTop 2000 - the wire mesh in burning chamber was nearly full of somethnig very hard and unburnt, blocking the right fire-up. After good cleaning and with new mesh and new seals, it works nice. After that experience I have opened another two heaters and all has this problem, but a a bit less blockage, so they were still starting. It is possible to download webasto service manuals from web. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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9th Dec 2020 10:05am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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ok, thats sounds user serviceable, is the guide on how to strip the units online? Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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9th Dec 2020 9:42pm |
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| Badger110 Member Since: 06 Feb 2018 Location: South hams Posts: 1025
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https://www.melloronline.co.uk/product_uploads/14417990441.pdf
Service manual breakdown. |
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9th Dec 2020 10:01pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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cheers, also this: https://www.experimental-engineering.co.uk...placement/ Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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9th Dec 2020 10:18pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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Well fuel line seemed ok, so have taken it out. Not a job I was looking forward to!
Click image to enlarge Click image to enlarge Click image to enlarge Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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13th Dec 2020 11:06pm |
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| Matt110 Member Since: 29 Jun 2014 Location: UK Posts: 673
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I feel your pain.
Literally. Still covered in red grazes and marks from getting mine IN that hole!!! And it's not even working yet. |
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14th Dec 2020 12:31pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7687
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well i fitted mine in there in winter 2010 so i guess its done well not having to come out until now! Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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14th Dec 2020 7:46pm |
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