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Webasto in the Alps issue

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Old 03-03-2013, 14:45   #1 (permalink)
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Default Webasto in the Alps issue

Hi all,

Did a trip to the Alps couple of weeks ago and had a great time in the snow but bit of an issue with our Webasto diesel heater.
Had been parked at 2000m for 3 days and it was working fine (warm in the day due to sun but -15 at night) but then it gradually started to blow less and less warm until one night it stopped altogether giving me a fault code 04 (premature flame recognition). Drove down the mountain and fueled up (wasn't that low before) back up to 2000m and it was fine for a while, then got less and less warm again. (not a problem with power - sorted that last year!)
Not entirely sure why, though I kind of have an idea, thought I would get your ideas first.
Bet Jon as in Jonandshell (top man!) will have something to say!
Cheers
Tim
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Old 03-03-2013, 15:46   #2 (permalink)
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Presumably you were filled up with winter diesel which should be ok down to minus 15c , but it certainly sounds like a waxing problem in the fuel.

IF that were the problem.. maybe the heater fuel line needs re routing to keep it away from the icy wind.. or perhaps lagging would help ?
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Old 03-03-2013, 16:07   #3 (permalink)
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Check the little filter in the inline fuel pump. Sometimes that gets clogged and wont feed the heater properly.
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Old 03-03-2013, 16:16   #4 (permalink)
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Hi Tim

I'm glad your van is performing well on your ski trips. We had 12 days straight in Val Thorens this year. It certainly tested our van this time round.

Our Dualtop played up this year due to bad diesel! Heat output fell, just like you describe. Our flash code indicated no fuel.

Even after refuelling with good stuff, I had to remove the Webasto dosing pump and put it over the hob to get it working again!

Strangely enough, just like you, we started to get low voltage faults recently. I traced it to a bad common negative connection for EVERYTHING on the left side of the van. I have since rewired the heater to the B2 positive and negative connectors at the CBE panel to reduce the current down that negative cable.

Shared experiences count for a lot on here!
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Old 03-03-2013, 17:12   #5 (permalink)
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The first time there was normal diesel in it (which I suspect didn't help) but then when we headed down the mountain I put local winter diesel in. Didn't get the flashing light fault the second time, but the heater def got colder.

I reckon that the fuel was def waxing up the first time, but shouldn't have been the second time. Also thought about insulating the feed and possibly running it somewhere near the heater exhaust to provide a little warmth - or is that a really stupid idea? Like big fire risk??

Great to hear from you Jon and glad you got away to Val Thorens again. Thoroughly recommend the Aire in La Plagne, right on the piste.

The other thought I had was the altitude. I was doing some reading up and apparently the heaters are only good up to 2000m and after that won't run properly for extended periods, you need to get them tweaked - read here for more info - http://sprinter-source.com/forum/sho...d.php?p=108984

Jon - you were at 2300m though yes? So figured if anyone would have problems re altitude it would be you! (and sorry to hear you are being plagued with the dreaded low voltage thing!)

Thanks all
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Old 03-03-2013, 17:30   #6 (permalink)
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I have read somewhere about the altitude issue with diesel heaters. The thin air would affect the fuel/air ratio.
We did notice that we had to turn the thermostat up a notch higher than is normally comfortable.............

Our diesel issues didn't just affect the heater, our engine wouldn't start until I had poured a couple of kettles of hot water over the fuel filter! All a bit frustrating when you need to off-pitch to fetch more fuel when the Webasto has given up the ghost!

We'll only be doing 5 days in VT next Feb, the rest of our time will be in Les Rousses, another resort with skiing from the aire. Free too!

Hopefully catch up and compare the cross sectional areas of our wiring soon mate!

-Jon
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Old 03-03-2013, 17:38   #7 (permalink)
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We used to have loads of problems in trucks and drivers used to put 50 50 red gas oil and paraffin and it worked
I Oslo think altitude may be some thing to consider less oxygen less combustion
So heater will not get hot enough to get a clean burn
The very early ebospachers used to recommend paraffin 1970is
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Old 03-03-2013, 17:46   #8 (permalink)
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would something like this help?

http://www.camskill.co.uk/m1b414s440...itive_-_300ml_


http://www.mkon.co.uk/apps/webstore/...s/show/2007329

Last edited by jhorsf; 03-03-2013 at 17:47.
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