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Truma Combi D6 heater - fuel-pump noise
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userhtrevor
Posted: 8 December 2018 12:24 AM
Subject: Truma Combi D6 heater - fuel-pump noise
 
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Hi
I have recently purchased a campervan with a Truma diesel heating system which heats the water also. Works fine except for the constant tick over of the pump which I cannot get used to. I wonder if anyone else has this system ( I’ve yet to find anyone) and has the same problem?
userDerek Uzzell
Posted: 8 December 2018 7:45 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


5000500050001000500100
Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


Welcome to the Out&AboutLive forums, htrevor.

The Combi D6 air/water heater was a a joint venture between Truma and Eberspacher. Originally the D6 was diesel-fuelled only, but now there’s a D6E version that can be powered by diesel and/or 230V. The appliance is essentially a Combi C6 (or C6E) with the Truma gas-burner unit replaced by an Eberspacher diesel burner-unit.

There have been on-line complaints on forums about motorhomes fitted with Eberspacher or Webasto diesel-fuelled heaters that the heater’s fuel-pump’s ’ticking’ is sufficiently irritating to make sleep difficult. Ways have been suggested to combat the noise (eg. using more flexible mountings for the pump to better isolate it from the motorhome’s body or relocating the pump so that it’s further away from the motorhome’s sleeping area).

I THINK one current forum-member (david lloyd) has a 2015 Chausson Welcome 717GA motorhome with a Combi D6E (though the information on his postings suggests he has a 2014 Hobby!). If he does have a D6E, he should be able to comment on the fuel-pump noise.

Another current forum-member (andy mccord) used to own an Adria motorhome with a Combi D6E heater (mentioned here)

https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Truma-6E-v-Webasto-4kw/46207/

so should also be able to advise.

It would be useful if you provided details of your campervan - make, model and build-year - just in case the pump noise is known to be a particular problem with that motorhome.
userhtrevor
Posted: 8 December 2018 4:21 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Derek

Yes I too have a problem sleeping with the pump on at night. Details of my van as requested.

Fiat Ducato Westfalia Amundsen 600D.
2017 but 1st. Registered aug. 2018
userDerek Uzzell
Posted: 8 December 2018 6:01 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


5000500050001000500100
Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


I did come across this Combi D6 (Australia) installation guide

https://www.manualslib.com/manual/1246695/Truma-Combi-D-6-Au.html?page=8

and you’’ll note the following advice

Route pressure-side fuel line in provided soundproofing hosemade from cellular rubber.

Allowing the fuel lines to come into contact with vehicle components or overtightening the cable binders may result in metering pump noise transmission (clicking).

Connect fuel line (in soundproofing hose) to unit and metering pump as shown in diagram. Secure soundproofing hose and connecting cable to vehicle using hose holders(part no. 34020-76000) or attach loosely with cable binders(approx. every 50 cm).
userKeithl
Posted: 8 December 2018 6:52 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Hi htrevor,

Whilst you are parked try 'un-mounting' the pump from the vehicles body and hang it either on the fuel pipes or with something like a rubber band and see if this reduces the noise. If it does look at re-mounting it with the softest rubber mount you can find which will still hold it in place.

Note that the flow of diesel through the pump must go uphill to ensure any air is purged from the pump.

Keith.
userspirou
Posted: 9 December 2018 5:13 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Not surprised some manufacturers/converters don't read manuals, the section on routing warm air hoses seems to be ignored most often.
userDerek Uzzell
Posted: 9 December 2018 7:28 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


5000500050001000500100
Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


An irritating ticking noise from a diesel-fuelled heater’s fuel pump is a common complaint, and not just relating to motorhomes. There’s a good deal of on-line discussion about it, including advice on how to address the issue.

https://tinyurl.com/y6twthes
userhtrevor
Posted: 10 December 2018 2:41 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Derek

Many thanks. I have tried everywhere to find if anyone else has this problem, but finding another Motorhome owner who had a Truma diesel heater was difficult, lots of
Truma heaters but not diesel. I sought out Truma at Caravan show at the NEC to no avail, I was even resorting to knocking on the doors of giant lorry cabs in lay-bys as I had heard they used these kind of heaters. Got some strange looks. So at last this forum has given me some hope. Tell me though could you by any chance have a recommendation for someone to be able to check the heater? It’s still under warranty but the company I purchased the van from do not seem to have much interest in the problem I have.

Trevor
userhtrevor
Posted: 10 December 2018 2:46 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Keith

Many thanks for your reply. Sounds like a excellent idea.

Trevor
userKeithl
Posted: 10 December 2018 2:48 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Hi Trevor,

Eberspacher diesel fired heaters are common factory fitments on MB Sprinter vans and there is always a lot of talk about them on the American Sprinter forum, including fitment and repair tips. They call them Espar heaters over there!

https://sprinter-source.com/forum/

They are also fitted extensively on canal boats so maybe a local marina could help with suggestions on your pump noise?

Final suggestion would be to either contact Eberspacher directly...

https://www.eberspacher.com/header-meta/contact.html

or one of their local service centres...

https://www.eberspacher.com/dealers/dealersearch.html

PS I have a lot of electronic copies of installation, service and repair manuals if you ever need them.

Keith.
userhtrevor
Posted: 10 December 2018 2:52 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Thanks Derek

Trevor
usermonique.hubrechts@gm
Posted: 10 December 2018 3:47 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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looks terrible. Have diesel fuel and pumps noise entering or locating above the floor. And not proper sound proof by means off.
userhtrevor
Posted: 10 December 2018 5:44 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Keith

Many thanks but I have A Truma not an Eberspacher.

Trevor
userKeithl
Posted: 10 December 2018 5:53 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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htrevor - 2018-12-10 5:44 PM

Hi Keith

Many thanks but I have A Truma not an Eberspacher.

Trevor


But, as Derek stated in his first reply, your Truma Combi was a joint venture between Truma and Eberspacher!

Derek Uzzell - 2018-12-08 7:45 AM

The Combi D6 air/water heater was a a joint venture between Truma and Eberspacher. Originally the D6 was diesel-fuelled only, but now there’s a D6E version that can be powered by diesel and/or 230V. The appliance is essentially a Combi C6 (or C6E) with the Truma gas-burner unit replaced by an Eberspacher diesel burner-unit.
userDerek Uzzell
Posted: 10 December 2018 9:59 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


5000500050001000500100
Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


htrevor - 2018-12-10 2:41 PM

Hi Derek

Many thanks. I have tried everywhere to find if anyone else has this problem, but finding another Motorhome owner who had a Truma diesel heater was difficult, lots of
Truma heaters but not diesel. I sought out Truma at Caravan show at the NEC to no avail, I was even resorting to knocking on the doors of giant lorry cabs in lay-bys as I had heard they used these kind of heaters. Got some strange looks. So at last this forum has given me some hope. Tell me though could you by any chance have a recommendation for someone to be able to check the heater? It’s still under warranty but the company I purchased the van from do not seem to have much interest in the problem I have.

Trevor


The link between Truma and Eberspacher in relation to the Combi D6 is mentioned here

https://www.truma.com/au/en/products/truma-caravan-rv-heater/truma-combi-d6.html

and Truma’s Installation and Operating Instructions are here

https://dealernew.truma.com/_anweisungen/Truma_Katalog/pdf_verzeichnis/30_000/34030_15300.pdf

https://dealernew.truma.com/_anweisungen/Truma_Katalog/pdf_verzeichnis/30_000/34030_04500.pdf

Diesel-fuelled Combis are relatively rare in motorhomes and (as far as I’m aware) no UK converter has chosen to fit them. Consequently UK motorhome dealers (and Truma technicians) won’t have the same level of Combi D-related familiarity as they have with gas-fuelled Combis, nor the same amount of trouble-shooting experience.

I’m doubtful that it would be productive to approach Eberspacher about this as the Combi D is primarily a Truma Combi heater that happens to have an Eberspacher burner-unit, not a ‘true’ Eberspacher product. Besides which it’s not the heater’s performance or reliability that you are complaining about, but the ticking noise that its fuel-pump makes and that’s more likely to be a consequence of Westfalia’s installation rather than an actual ‘fault’.

You could try sending a Private Message (PM) to user-names "andy mccord" and "david lloyd” (both of which are current forum participants) and ask them whether their Combi D’s fuel-pump produced a particularly loud ticking noise. I suspect though that the amount of noise the pump makes will depend on the make/model of motorhome, where the fuel-pump is located and whether Truma’s installation instructions have been carefully followed.

At the end of the day, as your motorhome is still under warranty, if you believe that the ticking that the pump is making is unacceptable, you’ll need to insist that the company that sold you the vehicle does something about the noise.
userDerek Uzzell
Posted: 11 December 2018 7:03 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp



I’ve now sent a PM myself to Andy McCord and David Lloyd asking if they can comment on the ‘ticking’ noise.
userhtrevor
Posted: 11 December 2018 9:41 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Keith

Sorry, I forgot Dereks comment about the Truma/Eberspacher link. Also thank you for the offer of the manuals, I might take you up on that later. Many thanks again.

Trevor
userhtrevor
Posted: 11 December 2018 9:53 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi Derek

Thank you for this. I am so glad I decided to join this forum and wish I had earlier. I will do what you advised and recontact the company that sold me the vehicle and show them the response I have had, if you do not mind me doing that? I will wait first to see if Andy and David respond to your query and also if it is permissible to send the company a transcript of our conversations.

Many thanks
Trevor
userdavid lloyd
Posted: 11 December 2018 10:29 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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htrevor - 2018-12-11 9:53 AM

Hi Derek

Thank you for this. I am so glad I decided to join this forum and wish I had earlier. I will do what you advised and recontact the company that sold me the vehicle and show them the response I have had, if you do not mind me doing that? I will wait first to see if Andy and David respond to your query and also if it is permissible to send the company a transcript of our conversations.

Many thanks
Trevor


Hello Trevor, sorry to hear of your irritating noisy heater. We did have a Chausson with the Combi D6E heater and, at first, I thought it was a splendid alternative to gas/electric. However, we did experience a constant ticking of the fuel pump when using diesel but as ours was located beneath one of the rear twin fixed beds (almost in the garage beneath) it was not particularly intrusive during the day or evening. At night time we nearly always turned it off. As Derek has gleaned from my avatar, we now have a Hobby Premium Drive with the more usual Combi 6E.

We also once had a Autocruise equipped with an Eberspacher diesel fired heater and that sounded like a Harrier jump jet when firing up! I would think location of the pump is the biggest determining factor in how loud the ticking will appear to be and in your Westfalia it's much more of a confined space than the Chausson coach built. I can only think that the suggestion to check and see if the mountings are sufficiently insulated from the body is sensible and if more insulation can be applied it may help reduce it but the ticking itself I believe is more to do with the internal mechanics of the pump and, if so, will be ever present.

Just as a final point, I spent most of my career on the ambulance service and later models were fitted with Eberspacher heaters. Again these were quite noisy ticks and can be plainly heard from outside the vehicle when stood with the heater running.

Sorry I don't have a solution though.

David
userDerek Uzzell
Posted: 11 December 2018 10:50 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp



For what it’s worth, I came across an on-line German review of a Westfalia Amundsen 540 where the GOOGLE entry carries a mysterious text (presumably machine translated) "However the heater is making a rather loud clicking noise when it's running on diesel, is this something you also experienced?” I can’t find where this comment originates, but it suggests that the ‘ticking’ is not unknown for Westfalia models that have a Combi D.
userandy mccord
Posted: 11 December 2018 12:04 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Sorry Derek

My Adria was a 6E 240/Gas, not diesel so I cant be of any help im afraid

Regards
Andy
userDerek Uzzell
Posted: 11 December 2018 1:34 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


Thanks for clarifying that Andy.

My fault for misreading an earlier forum thread in which you said plainly that it was a Truma Combi 6E gas-fuelled heater that your Adria motorhome had.
userhtrevor
Posted: 11 December 2018 10:34 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Thanks for all your help Derek. The conclusions I am drawing from yours and other replies is that the diesel system has many benefits I.e. cheap to run, very efficient and more garage room with less gas bottles. The problem I have though is the inability to get used to the ticking noise. I am aware that that is the way the system works but it is not so much of a problem if the pump is well away from the living /sleeping area I.e. in a large Motorhome/ boat or large truck where the pump can be located in a position well away from the sleeping area. Unfortunately that is not possible in my relatively small van where the pump is in the middle of the vehicle and so obtrusive. I think from my investigations that there are very few vans of this size (6 metres) whereby this heating system is used and it was my misfortune to purchase the vehicle with this type of heating. If using the information gathered from the kind responders fails to improve the noise then I will probably be forced to sell the van in the near future unfortunately.

Kind regards
Trevor
userhtrevor
Posted: 11 December 2018 10:47 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Hi David, many thanks for your reply. What you are saying about the pump being in an unobtrusive location and not really being a real problem because of that fact is the conclusions I am drawing from these kind responses. Unfortunately my vehicle (6 metres long) has nowhere to hide the pump and is in fact in the middle of the vehicle which is the main reason for my problems with the ticking. Yes it sounds like a jet if it starts up from cold but that is not a problem, it’s just the constant ticking or in the van it goes bom, bom, bom like a heartbeat.
Thanks David
Regards

Trevor
userhtrevor
Posted: 11 December 2018 10:49 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Yes that is the problem I have.

Trevor
userspirou
Posted: 12 December 2018 5:15 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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I've been thinking about a diesel unit for the next van so this has been interesting and I've searched for more info. Seems you can't get completely rid of the noise but proper installation and sound proofing of the unit should help a lot. Mentioned specifically was mounting the pump on a rubber mat to prevent sound transmission to the chassis.
userDerek Uzzell
Posted: 12 December 2018 8:23 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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Location: Herefordshire - 2015 Rapido 640F LHD 2.3ltr 150bhp


As this 2003 boat-related discussion will show

http://www.ybw.com/forums/showthread.php?29952-Clicking-noise-from-heater-fuel-pump

the ‘ticking’ noise that can be made by the fuel-metering pump of Webasto or Eberspscher heaters is far from a new phenomenon.

As I said above, there is plenty of on-line advice/syggestions on how the noise might be addressed and - for the Combi D heater - guidance in the related Truma Installation Instructions on how the pump should be mounted.

In Trevor’s Westfalia’s case, either the pump is unusually noisy and requires replacement, or the pump and its fuel lines are not optimally fitted to keep noise to a minimum, or the pump is located where its operating noise will be very obvious to people trying to sleep. I’m not sure how easy it might be to relocate the pump so that its ticking would be unlikely to disturb a sleeper, but it should be practicable to decide if the pump is louder than it should be and/or whether the installation fails to meet best practice.

As the Combi D6 is a Truma/Eberspacher mongrel it’s reasonable to assume that the metering pump is an Eberspacher product and that it should be installed as Eberspacher recommends. Earlier in this thread Keithl suggested contacting a Eberspacher specialist

https://www.eberspacher.com/dealers/dealer-listings/heating-dealers.html

who ought to be in a position to say whether the pump’s operating noise is normal or not, whether the installation is acceptable, and what might realistically be done to reduce the noise.

There is a Westfalia Mobil Facebook page

https://www.facebook.com/WestfaliaMobil/

and participants seem prepared to write in their native tongue (not just in German). I’d be tempted to write

"I recently bought a 2017 Westfalia Amundsen 600D motorhome. The metering pump of its Truma Combi D6 diesel-fuelled heater produces a constant loud ticking noise that makes sleeping very difficult. Can other owners of Westfalia Amundsen motorhomes with this Truma heater say whether they also find the metering pump very noisy and, if so, how can the noise be reduced?”

I’m no fan of Facebook generally, but companies tend to monitor their own Facebook pages, so there’s a reasonable chance of getting feedback.

I’d also contact “Campersales” about the ticking noise

https://www.campersales.co.uk/contact/

(unless, of course, they sold the Westfalia to Trevor...)
userbobalobs
Posted: 13 December 2018 10:49 AM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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All our Campers since 1985 have been fitted with either Webasto or Eberspacher diesel heaters in various formats . The Webasto is quieter but they all have the diesel pump "tick" which can be irritating in the dead of night. Our current Webasto has a sophisticated timer and if we need heating when in bed we use an oil radiator with the webasto starting an hour before we need the shower and increased heat. If we are off hookup there is normally no need for any heating when in bed.
usermonique.hubrechts@gm
Posted: 13 December 2018 6:09 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 


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I did some trips whit my new T6 and webasto airtop running. and that can be heared. But no ticking. What ever you have in the house mobile and at home, and their location some noise will occur. Cheers.
userhtrevor
Posted: 13 December 2018 8:17 PM
Subject: RE: Truma Combi D6 heater - fuel-pump noise
 
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Thanks Spirou

Yes that could be a possible solution.

Trevor




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