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Author Topic: Webasto not working combustion air fan and circulation pump  (Read 506 times)

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January 05, 2018, 01:26:01 PM
Reply #15

Smeeagain

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Re: Webasto not working combustion air fan and circulation pump
« Reply #15 on: January 05, 2018, 01:26:01 PM »
It's telling you pretty much what it says on the screen i.e. the pump currently has a fault, and the other parts (highlighted in yellow) have previously recorded a fault.
It wont tell you what the current fault is, simply what part the fault relates to (ie it wont say broken bearing, blown fuse etc it will just say fan, pump etc)

So there should also be an option to clear the fault codes. so i would clear them all, then run the car as normal for a day or two, then hook it back up and see if the fault is still shown as current. Then take it from there

Smee

January 05, 2018, 04:28:05 PM
Reply #16

Hairdye

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Re: Webasto not working combustion air fan and circulation pump
« Reply #16 on: January 05, 2018, 04:28:05 PM »
Thanks smee I'll do that and see what happens next .

January 12, 2018, 06:19:49 PM
Reply #17

Hairdye

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Re: Webasto not working combustion air fan and circulation pump
« Reply #17 on: January 12, 2018, 06:19:49 PM »
Guys I need help
I removed the errors and once it had been run the same errors came back. It was booked into an auto electrician but that was a waste of time because they told me what the errors were which I knew anyway (I thought they were just testing the webasto as they were webasto specialists) . Anyway I had had a new circulating pump fitted and the other was definitely faulty. A mechanic who I know  tested the combustion air fan on the webasto and he said when he run lives to it it worked. However when assembled  the unit still doesnt fire or make any noise  at all not even when a live is applied to the little wire on the webasto. If the fault code is showing as the combustion air fan faulty, but it only works when stripped down and a live added what the hell can be wrong.  Could the circuit board be broke?
Also does the circulating fan only work when the webasto is working ?  As this doesnt buzz when the engine is running either .
Thanks for any help you can offer .

January 12, 2018, 06:59:37 PM
Reply #18

X5Sport

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Re: Webasto not working combustion air fan and circulation pump
« Reply #18 on: January 12, 2018, 06:59:37 PM »
Circulation fan will only run when the Webasto is operating.  If it works when powered independently then the PCB is the likely - and common issue.  It could be a dry joint (bad solder), a cracked track or component failure.  Look for any signs of burnt components and look at the tracks and soldering under a bright light and magnifying glass.  You can also try very gently moving components to see if the connections to the PCB tracks move - they shouldn’t.

Beyond that it will probably be a PCB repair specialist job.
:type:

January 12, 2018, 07:33:07 PM
Reply #19

Alan Gunn

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Re: Webasto not working combustion air fan and circulation pump
« Reply #19 on: January 12, 2018, 07:33:07 PM »
Anybody got a pic of "pin 1" so i know were to put the 12v to test mine.

January 12, 2018, 07:53:36 PM
Reply #20

Hairdye

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Re: Webasto not working combustion air fan and circulation pump
« Reply #20 on: January 12, 2018, 07:53:36 PM »
Cheers x5 sport .
That does make sense although I'm a bit annoyed that the webasto specialist didn't pick this up as I asked them to check.
Is the pcb easy to remove or is it a major strip down ?
Many thanks

January 12, 2018, 09:43:29 PM
Reply #21

X5Sport

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Re: Webasto not working combustion air fan and circulation pump
« Reply #21 on: January 12, 2018, 09:43:29 PM »
There is a thread on here somewhere on how to do it.  A couple of members have diy’d it.  No idea if the pictures might have been replaced by the Photobucket screen now they want $400 a year for 3rd party hosting!
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January 13, 2018, 04:10:20 PM
Reply #22

marinaman

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Re: Webasto not working combustion air fan and circulation pump
« Reply #22 on: January 13, 2018, 04:10:20 PM »
the pcb comes out very easy,   just prise the lid up and there are a few screws holding it in.

ive given up on mine,  as it will fire   then stop but wont work even with 12v on pin 1
There is this chap in Finland or somewhere will check and repair, i found it on here but when i contacted him he wanted £100 ish to simply check it
i bought a used one from Ebay   and that didnt work either

From more web reading the rover 75 group has a lot of info on this subject as its fitted on that car and there is a chap called French Mike who supposedly repairs them very cheap.   no further info on him though.
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January 13, 2018, 05:34:21 PM
Reply #23

Hairdye

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Re: Webasto not working combustion air fan and circulation pump
« Reply #23 on: January 13, 2018, 05:34:21 PM »
Thanks pal. I'll see if I can take it out and have a look to see if shows sign of damage. Must admit I'm on the verge or forgetting about it as it's driving me mad. I just hate things not working even though I don't know I had a webasto for the last 2 years
Thanks

January 14, 2018, 12:31:07 PM
Reply #24

marinaman

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Re: Webasto not working combustion air fan and circulation pump
« Reply #24 on: January 14, 2018, 12:31:07 PM »
Yup,  same here,  if its on, it should work always been my motto as well.

Had same probs with eberspacher on last car but didnt seem as complex as this

i fitted a used unit,  didnt work apart form usual few mins,  sold it as non worker on Ebay,  bloke simply connected power fuel and had it working straight away in his shed,  so nothing wrong with it, somehow the car msut not have been talking to it.
I have given up, annoys me but thats life.
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