Aux Heater Fault
 

Just done a first for me VCDS scan and then cleared all codes and re-scanned. Had 2 sticky faults. One is a parking sensor that I knew about that I will get replaced. The other fault was Aux Heating. I'm assuming this is the Webasto for pre-heating the engine in the cold. Here is the VCDS scan fault:

Address 18: Aux. Heat Labels: None
Part No SW: 4E0 910 105 A HW: 4E0 815 069 H
Component: Heizgeraet H08 0160
Revision: 0000000D Serial number: 00000009013887
Coding: 0000001
Shop #: WSC 00000 000 00000
VCID: 1A3B8C2BD50D7DEE85-804E

1 Fault Found:
01406 - No Flame
000 - -

Any ideas what this is or how to clear it?

Thanks

Done a couple of the Webasto style aux heaters on Range Rover sports , they flag a code similar ' no flame seen ' or some such , on them it's been the glow plug in the burner chamber , strip down of the unit to get at them ,on the range rovers they are really easy to access , on the Audi you may know they are behind the bumper and still a bit more to get it all out after bumper off .

There is a few tests on vcds with regards to activations maybe worth trying them , the glow plug can get fouled with old diesel if it's not run for a long time ..... worth a try before stripping out

Lee

You could try an adaptation - maybe it is a 'sticky' code for safety reasons?

Unlock heater module by saving a 1 in Adaptation Channel 007, then clear fault codes.

I can't remember but you may need to go in Security first and enter a log in code, but VCDS should popup with a speech bubble with the code in it.

Thanks guys. That's interesting. I'm a VCDS amateur (only bought it the other week and tried it for first time yesterday) so I may be back with some more questions if I can't figure things out. I thought it a bit odd that there was no other info such as dates etc with this fault.

Yea as above the units will lock themselves out for safety reasons, the BMW's would need the fuse pulling to reset the unit so you could then reset the codes.


Just found this, your heater is a thermo top z usually

http://www.seatronic.no/pdf/Webasto/...P-Z_Manual.pdf

Just tried the adaptation and no joy. Just faults again with the same thing. Is it odd that there is no further data with the fault other than the description "01406 No Flame"?

I may try and pull the fuse and see what happens. As far as I know it always seems to have worked in the past (engine heated up quick and exhaust smoke at front of car), but we haven't really had any temps below 5 to try it this year. I'm wondering if there is a plug off or a connector loose. Where is this thing situated on a 4.2TDI ? I had a dealer do work on the front of the car 2 years ago when I hit a fox. Maybe it hasn't worked since then.

The VCDS test seemed to be limited to some kind of combustion chamber fan test. I didn't try that. Maybe I will after I check the fuse.

Thanks for the links and hints. I wonder if there is any way of performing a functional test on it via VCDS or the menu systems just to get it on and heated up and running. That might clear any faults or at least tell me if it's dead or not.

You should be able to do a function test but it needs to be done on a cold engine, it should be located the same place as all a8 tbh, have a look underneath, you should see an orange ring with a metal tube poking out ever so slightly at the front of drivers front wheel iirc.

Hello Lee some thoughts , the fact that you can communicate with the aux heater I would say it is powered up as the self diagnostic function comes from the aux heater unit itself .

The unit like already said is beneath the drivers side head light behind the front bumper , it's a bumper off job to get anywhere near it and it's still awkward to access the wiring with bumper off , when I bought my 4.2 tdi fitting the aux heater extra water pump was one of my first jobs I did on it , there's a superb thread on the subject called 'definitive guide to aux heater mod ' or something like that , it has all pictures and write up , it's done on a newish looking car , try the same job with 10 years of corrosion on the bolts !!

Run through the output tests with vcds and listen carefully near the headlight , is there and output test for ' diesel supply pump or maybe dosing pump ' for that one sit in the car and listen , it's a very faint ..... technical term ....kerchug , kerchug sound . Is there an output test for glow plug ??



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My aux heater works fine but I have always had this code since the coding , as you can see there is no date and time stamp , perhaps the aux heater does not support it.

Thanks Lee. I will deffo do the test in the morning when its all cooled down. I found this too..

http://wiki.ross-tech.com/wiki/index.php/01406

....a Ross-Tech wiki page on the actual fault. Looks like a fuel supply issue. I'm wondering if it's just because it hasn't been started in what could be months and months.

Yes , do all the tests and listen out for the dosing pump , is your car enabled to run the aux heater from the set up menu on the climate panel


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Still haven't had chance to fault find on this one, but as the temp here dropped down to below 6 degrees I thought I'd have a quick look under the front drivers side when I started her up this evening, but there didn't appear to be any smoke coming out. The car had probably got to 90 degrees within about 6 miles, which seems normal.

Now here's the odd thing. I could have sworn blind that I had the Aux Heating and Aux Ventilation menu on the AC page of the MMI, but it's no longer there. Could this be something that is related to the Webasto not working or has it been coded out somehow? Is there any way to get this menu back up at all?

Sorry for all the questions, but this is bugging me now as I know it was all working a couple of years ago and I'm wondering if somebody (ie Audi) have screwed something up during a service or repair?

I will deffo pull the fuse and check that tomorrow and also try the aux heater functional tests when I get a moment.

Cheers all

Hello Lee , sure said this before some where search for ' definitive guide to fitting auxillary heater ' its on this site , it goes on about how to code the aux heater so you have the mmi timers and manual start functions .

Had a look on mine the other day in aux heater activations , glow plug run is there , well is on mine anyhow , feed pump run , combustion fan run its all there




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Thanks Lee. Will give this a go tomorrow or weekend. It's going in for a 4 wheel alignment tomorrow morning so will get that done and then concentrate on fixing this snag and the parking sensor snag. Should be all shipshape again then.

Thanks once again and I will post back on my findings.

Cheers.

This gets even more bizarre. Just checked my build sticker and it doesn't have this 9M0 code:

Auxiliary heating - 9M0 - Without auxiliary/parking heater

So how can I have a Webasto fitted? Or is this a different thing?

OK. So ran all the tests on this module. There were about 5 or 6 tests.. they all seemed to go through OK. The dosing pump test made the clicking noise. I then cleared the fault code and it remained clear (hooray). I started the car (AC and heated seats on, coolant < 70 and ambient outside temp about 2 degrees) and it seemed to fire up OK. Smoke from under the front of the drivers wheel. No more fault code either. The fault seems to have cleared itself. Must have been due to an extended period of inactivity I think.

I still don't have the Aux Heating menu in the MMI though, so I might look into coding that in. Would be handy just for the ventilation function to vent the interior in the summer when leaving work.

Thanks for all the input. False alarm I think... Sorry guys.. :o

I have just enabled the Aux Heating in the MMI menu and it appears to be all working.

I was a bit worried about the Aux Heater overheating and throwing a fault code but it seemed OK when it was on for 5 mins this morning. Then... and this is the odd thing... I decided to check out Module 18 again. The Aux Heater module. I went into the adaption screen to check channel 10. This is the channel that is set to '3' when you fit the circulation pump. I expected to see this set to '0'.... but no. It was already set to '3' and I was getting readings such as duty cycle % and other things.

I have NEVER set anything in here before with VCDS and I'm only the second owner with the first being an Audi dealer. Could it be that I actually have the circulation pump fitted from standard? Is there any way of telling? Noises? Measuring blocks? After running the Aux Heating there were no fault codes anywhere and the dash icons were working too. Do I have the pump?

With engine off set the aux heater to come on for a 15 min time period , if there is no pump the heater will shut down due to water temp over heat and you may here the pipe work ' thunking/gluging ' due to the aux heater boiling the still water in its own water block .

This is what my car did until i fitted the aux water pump .

You are right, mine used to do do exactly that - you could hear gurgling and it would shut off and throw an overtemp code. I did some additional adaptations and now it heats the car. Even on a frosty morning it will melt the ice on the front and side windows and when you get in the car it feels warm like it was just driven and the side face vents are blowing hot air (nothing out the centres).

I will check the values and paste back in this thread. IIRC there is a residual heater pump in near the heater matrix that circulates the coolant well enough but it is not activated just by coding.

Auxiliary coolant pump, we all have it (D2's and D3's). It's the thing that stays on when you use the "rest" heating function and when it gets old/worn makes an awful noise.
Which is why mine has no power to it......

How do you enable the aux heating controls in the MMI? I had a webasto in my old A2 til late 2014, and would hear it operating when the temp was low and the climate was not set to ECO.

Since having the 8, it's not been so cold, I've not heard anything or seen smoke from the underside of the front. Car heats up pretty damn quick compared to the old 1.4 3 cyl diesel I had. I replaced the thermostat and temp sensor on the 2, but the small CC diesel lump did not put out much heat. And the webasto would only work below a certain temperature. In theory this was good, but short journeys above that temp the engine wouldn't heat up and the webasto wouldn't function. Is it correct that on the 8 you have to set the climate to HI to have the webasto function, and be below a certain temperature?

John.

AFAIK John, the Webasto will fire up when the coolant is below 70 degrees and the outside ambient air temp is below 5 degrees. You should hear the pulsing of the dosing pump and there will be smoke/fumes emitted from just in front of the drivers side (RHD) front wheel in the under-tray.

To code in the Aux Heater screen, I just went into the AC/HVAC module in VCDS and selected option 7 - Coding and then added 2 to the number in the first box. Mine ended in 45 so I changed it to 47 and saved it and when you do an ignition off and then on again it will appear in the CAR > AC MMI menu.

Thanks guys, I have set my Aux Heater to come on this evening at 18:15 so I will nip out and see if I can hear any noises or gurgling. Bit odd that it had '3' in channel 10 of the adaption screen though if it didn't have a pump.

I have been thinking about this. I'm 99% sure I had this function when I bough the car. Then it went in to have a new instrument cluster fitted due to flickering lights on the speedo. There was a bit of a hoo-hah about it all from Audi and eventually it was done under original warranty. When I got the car back I noticed that "radio controlled clock" was an option on the MMI menu that was never there before (it doesn't work anyway as it doesn't have the module) but I'm wondering if they "accidentally" coded out the Aux Heater when fitting this instrument cluster. It does have the little flashing icons for the heating/ventilation when activated so that works.

Thanks Snap

Thanks Lee.

Bollox... The Aux Heater fired up great on the timer but then conked out due to low battery voltage... Baaah !! :mad:

These are my notes sorry they are a bit rubbish.
Adaptation - channel value - meaning of that value

01 8=4˚ aux-heat
02 8=4˚ aux-heat
03 0= disabled WOT shutoff
06 0=intelligent aux-heat/vent
07 1=shut off timed aux-heat when ign off
08 1= voice recognition quiet mode (not implemented until late model)
16 1=activate aux-heat if required for residual heat function
18 0=shut off when energy manager says so
19 0=use aux-heat when required by heater demand
20 1=rear heated seats not switched off after 10 mins
21 1= add another line to MMI for engine pre-heat (coolant shut-off valve fitted)

[quote=Lee S;105134]Bollox... The Aux Heater fired up great on the timer but then conked out due to low battery voltage... Baaah !! :mad:[/QUOTE

Yes I have found this an issue with the aux heater , I use the car near enough every day but I don't work far away from home , so every morn slow progress in the school traffic and same coming home so the battery does not get a ' deep charge cycle ' and the cold weather takes its toll on the battery over night so I find the aux heater will work ok for a couple of mornings and then knock of due to the battery regulation monitoring safe guard shut down and the 'quiescent current ' fault codes .

I think if your car does get a good run everyday it will be ok , does anyone have any info on the factory system for aux heater that has the extra battery ??
I have already replaced the battery with a Bosch unit better than oe spec but still have issues ..... I have started taking a longer route to work just to give it some charge time ....hehe ,not a bad thing , would be interesting to see how the factory supplied aux heating cars work this out ... maybe use an AGM battery for the aux heater side ??

Lee s ....
Go into battery regulation module , just go through the adaptations ...think it's about group 6 have a look at the s.o.c block ....state of charge percentage , I have found when aux heater shuts down its normally around the 50 % area , the car always starts no problem though even after it has shut it off , if I take the car for a run over an hour or so the s.o.c is back up to 100%

Well I have enabled the battery meter via the hidden menu and it was allegedly at 20%. Had to do about 40 miles to get it back to 100%. See how long it lasts. It's warming up again tomorrow so probably wont need it but I will give it a try anyway.

Didn't work... came on and fired up and went off after about 4 or 5 minutes after a few gurgles and groans. Looks like I don't have the pump fitted so a bit odd as to why channel 10 was coded to '3' but never mind. I may get the pump fitted for next year. Just glad that the Webasto is serviceable and working fine. Thanks all. +++

What about doing what Snap D says about getting the 'rest pump ' to do the pumping

How do I do that? Do I just add Snap's adaption codes/values in and that's it? Sorry.. I'm a VCDS dunce...

I would say Snap D has more knowledge than me in this field , im really not sure which adaptation gets the rest pump working , hopefully he will be along at some point and give you a lift .

Keep at it mate is a great function , mine did a 30 min run this morning before i got in the car ...... it was lovely and toasty inside hehe+++

You know what - I am doubting what I said, because today it was timed to come on and the car was cold. The times when it was warmed up is when I went out before breakfast and without turning on ignition I held the on/off button on the HVAC controls until it came on, set both side to HI and locked up and went back inside. When I do this it is very warm 20 minutes later, but doesn't seem to be the case when on the timer - it comes on but seems to have little effect.
Not enough fuel to test now it is disabled when the low fuel warning is on.

I use the "Set Up" button on the HVAC control.
Rotate the right hand knob to select "Aux Heater On" and the Webasto fires up.
Snap, I'll try your way on Sunday. I have an early start in the bus and nobody else will need the car.
When I use the timer the Webasto fires but does not "toasty" the car, but the engine and heater seems to do the warm up much quicker. But then that is what the Aux Heater is for, until you add the extra pump and plumbing.
Nothing to do with this thread/forum but I have a night heater under the bus and this operates on it's own timer but all it does is blow a small amount of warm air into the bus. It makes ice on the windows much softer that then clears with the wipers. Certainly takes the edge of the temperature. In a smaller vehicle/cab it would be good.

So this is using the "rest" pump and the aux heater then? How does that work yet the aux heater on the timer doesn't work? I don't understand. Or is it down to your extra adaptions Snap? I might try that now.... see what mine does. Surely it will just set the pipes gurgling again won't it?

Auxiliary Heater water pump is mounted to the Webasto unit so the water pump is right near where it needs to be efficient to get the water flow up to the heater matrix .

The rest pump is there to allow the heater to give warm air when the engine has been switched off , but it must be able to get some flow through the aux heater and stopping the water from boiling up ....just some flow will be enough to stop the water from boiling and getting the flow into the heater matrix core

Interesting. So do I need the aux heater set to on or will it come on on its own when I turn the hvac on via the on off button? This could be a reasonable solution by the sound of it. Will have a play in the morning. And this works on a cold car with the ignition off?

A day earlier than planned but a neighbours bloody house alarm woke me up.
I tried the "On/Off Button" method, when the HVAC lit I up turned the temp up to "HI". Locked the car and went indoors for a cuppa.
Waited twenty minutes, went out and could hear the blowers turning but no Webasto. The car was cold.
Turned ignition on and used the "Setup" button to turn the "Aux Heater" to "ON". Turned ignition off and tried the "On/Off" method again. As before the blowers started but this time the Webasto fired up.
Went for another cuppa.
Back outside found the blowers turning, Webasto off and a cold car.
Today temperature is much warmer than it has been.
I guess the only way forward is to do the Webasto pump mod. Any spare cash someone, pretty please? :D

Maybe that requires adaptation channel 19 to 0? Start aux heater when required by hvac set temp.

After a weekend of tests. I conclude that mine does not heat the car at all when running on timer for 30 mins.
Even on HI.

It heats the car nicely from stone cold if I go out and hold the hvac on/off button until it lights up and turn the temps up to high.

In both cases, the small symbol flashes in the clock on the speedo.
While I would like to fit the £60 additional pump. I doubt I will but for me it is no problem to just go out before breakfast and manually turn it on if the weather requires it.

Thanks Snap. I will give your adaptions a try and just use that myself too. I too don't mind just popping out 15-20 mins before leaving in the morning. The pump maybe something I'd do eventually though.