B & D Murkin
UK main importers for
Le Tonkinois varnish
Flexidisc sander
Le Tonkinois Varnish
Eberspacher Diesel Heater Introduction.
You may be wondering why free independent DIY help on Eberspacher and Espar heaters is included on a commercial varnish and sander website. During our Le Tonkinois Varnish and Flexidisk Sander demonstrations on boat shows we became aware that many Eberspacher owners lacked the information to service and repair their heaters. We love our Eberspacher heaters and this section of the website was originally added as a thank you to our existing customers but has expanded to become a unique and highly respected source of Eberspacher information.

Eberspacher diesel heaters are designed for use as night heaters in trucks but are also installed in boats, caravans and vans. Their main advantages over gas heaters are the significantly lower fuel cost and they can run from the engine diesel supply.
These web pages are not intended to replace dealers or service agents, just as Haynes car manuals do not replace garages, but to enable users to do some servicing and repairs on their own Eberspacher heaters.
Our pages are primarily aimed at boat and caravan owners who are experiencing problems or wish to avoid future problems.
We occasionally get asked if we also cover Webasto heaters, sorry we only know about Eberspachers but they work in a broadly similar way so quite a lot of the general Eberspacher information will also apply to Webasto heaters.

Between us Derek and I know a lot about Eberspacher air heaters. We are also steadily increasing our knowledge of water heaters.
We are not Eberspacher professionals, just enthusiastic and very knowledgeable amateurs.
Both of us are retired, Derek specialises in the mechanical side, I, Roy, was a professional electronics engineer.
We do this as a hobby, not a commercial business, so we do not service, repair or sell Eberspacher heaters or spare parts.
We only cover Eberspacher diesel heaters on our site. Petrol models should only be serviced by people who are suitably experienced and can safely work with petrol.

Diesel heaters are reasonably simple devices and are usually very reliable if regularly serviced. Many users are surprised there are so many reasons for heater problems, we try to cover all possible causes that we can think of, many are just theoretical.
We now cover these problems in depth except for those caused by installation which should be done by professionals so the site contains a great deal of information and is still expanding as we learn more.
Hence finding the bit you need may take a little time.
The Site Map page may be helpful to find your way around.
Individual models are covered in the models pages.
The starting point for users experiencing problems are the fault finding and servicing pages.
Eberspacher and Espar manuals details are on the Manuals page.
Our contact details are given at the bottom of this page.
The reason for having this site is to promote our Le Tonkinois natural varnish and Flexidisk sander products, we hope you will look at those pages as well as these.
Manuals and servicing information that may be of interest.

Download links for manuals  Manuals page.

Servicing information
Servicing D1LCC                   D1LCC page.
Servicing D3LCC                   D1LCC page.
Servicing D2 & D4                 Airtronic page.
Servicing D5LC D5L              D5LC D5L page.
Servicing D5                            D5LC D5L page.
                                                   Troubleshooting manual. 
Servicing D1L                           D1L page.
Servicing D3L                           D3L page.
Servicing DW4SC DW5SC   Hydronic page.
Servicing D4WSZ D5WSZ    Hydronic page.
Servicing D10W                       D10W pages
Servicing other models           Check the manuals, several contain servicing info.
                                                   Check models pages.

Servicing of other models should be similar enough to enable them to be done without instructions.
Please take plenty of photos so we can add more models to our servicing pages to help other users.

Feedback on our Eberspacher pages has been very positive, keep it coming.
As a result of the feedback I am still working on improving the existing pages, increasing the models covered as well as preparing to add extra pages.
If you want to add links to us from forum articles etc please do so, each link helps the site get more widely known.
We would appreciate an email, contact details below, if you found these articles useful. It helps us to gauge how much interest there is and whether it is worth spending a lot of time improving the pages.

Eberspacher D1LC Compact (D1LCC).

Eberspacher D2 Airtronic.

Eberspacher model naming is confusing so a brief explanation of the models may help.
Older models had a naming convention, newer models do not follow this system.
First Letter - D diesel, B petrol. 
Number generally represents heat output, higher number higher output
Letter - L air,  W water.  Older models only, newer models do not use this convention and use L for Large.
Any letters following identify the model, eg D1L,  D1LC,  D1LCC.

Air Heater models
They were manufactured in the order D1L,  D1LC,  D1LCC, with Airtronic D2 being the current model.
Similarly for higher heat models        D3L,  D3LC,  D3LCC, with Airtronic D4 being the current model.
                                                              (Airtronic D3 is not sold in UK)
                                                              D4L,   D5L,    D5LC,   with Airtronic D5 being the current model.
Water heater models
Oldest models           D4W (not sold in UK), D5W, D7W, D9W, D10W.
Hydronic OEM           D3WZ, D5WZ, possibly D4WZ,  (OEM specific heaters with no water pump)
Hydronic current        D4WS (24v), D4WSC (12v), D5WS (24v), D5WSC (12v)
Hydronic II                  D4S, D5S, D5SC   (Not currently being sold in UK, they are on the continent)
Hydronic M I              D10W
Hydronic M II (2013) M8, M10, M12,
Hydronic L I               L16, L24, L30, L35
Hydronic L II              LII16, LII24, LII30, LII35

Stating the obvious, when identifying models always look at the label.
Most labels show 3 consecutive years, eg 01 02 03.  This was originally a requirement of German approval. The installer would mark the label with the year the heater was commissioned but I have never seen any label marked. All you can tell is the heater was made in 2001, possibly earlier, and probably first installed in 2001, 2002 or 2003.

Contact us.
If your fault is not covered in our fault pages we give advice but our other interests and the number of queries means we occasionally have to limit the time spent for each query. Therefore it is in your own interest to use our webpages before contacting us, otherwise you may run out of time for advice.
Derek is currently not actively dealing with Eberspacher queries - He has become increasingly annoyed that after spending a great deal of time preparing carefully worded replies some people do not have the courtesy to say thank you or feed back details of whether our diagnosis cured the fault. I will continue to deal with queries but I am already noticing the same problem.
We have a questionnaire in Microsoft Word document format that covers the information we would like, click here to download a copy.
We deal with queries as and when convenient, sorry but we do it as an unpaid hobby and other things can be a higher priority.
If you need a really speedy reply go to a dealer.
If you get no reply after a couple of days your email or our reply has probably been lost in the system so contact us again.
We have no crystal ball, you have to be our eyes and ears, the more info you give the more chance of getting a good result. Unspecific queries like "My heater won't work, what's wrong with it"  gives us no information and just wastes our time so a standard reply to that type of query is "No idea, go to a dealer"
Our practical knowledge of water heaters is limited, it is improving as we deal with more queries but don't expect miracles at this stage.

Enquiries sent to our main website can be delayed before being forwarded to us.
Replies may be from a different email address so check your junk filters.

Roy Murkin  AMIEE
Airtronic heater operation.

Fuel is pumped in tiny measured amounts into the Eberspacher.
It is mixed with the combustion air and burnt in the combustion chamber, the hot gasses pass through the inside of the heat exchanger before reaching the exhaust.
Heating air is drawn into the front of the heater and is heated as it passes over the outside of the heat exchanger.
The heating and combustion air paths are completely separated.

Although the pages are primarily based on Eberspacher D1LCC, D3LCC, and Airtronic D2 D4 D5 heaters most of the information applies to other models including water heaters.
For non current Eberspacher models look at the models pages, any model specific information will be given there.
We are in the process of adding specific pages for Eberspacher water heaters. It takes a considerable time to research and prepare the information so these pages may be published initially as unconfirmed and only partially complete. We will do our best to get the water heater information accurate but our practical knowledge on water models is extremely limited, please feedback any additional information you have to improve the pages.
We are aware of Eberspacher Technical Bulletin No 281, Inland Waterways Boat Heating Findings.
This document is about solving common problems on narrow boat Eberspacher water heater installations. It also applies to other boat installations, click here to view.
Some of our information is available from various sources but a lot is not easy to find.
Forum articles are notoriously difficult for the non expert because they include a lot of wrong or irrelevant advice.
We have combined the most useful information from these sources together with our own experience into a single reliable source.
If you notice errors or have additional information let us know so we can improve the site.
We do not include most installation details, that is not the purpose of this site, we recommend installation is done by dealers.
Installation and repairs should always be done to a very good standard, bad installations can be dangerous and might invalidate insurance.

If you need a dealer a list of Eberspacher main dealers is on www.eberspacher.com.
Eberspacher heaters are marketed under the Espar name in America and Canada.
Ardic heaters are also a part of the Eberspacher group of companies but we know nothing about them.
   The complete stock of Ardic spares are now held by Espar Plymouth,  www.espar.co.uk/espar-plymouth-products-ardic.html

If you are going to service a model we have not pictured here please read our request for photos below.

WARNING Some sellers on ebay are listing used non standard Eberspacher truck heaters, some will not work as standard heaters when taken out of the truck, see our Buying pages for more information and advice to avoid some very expensive mistakes.

WANTED Dead or wounded Eberspacher heaters or parts
As a pair of pensioners we have more or less gone as far as our wallets will allow on our website, but we can go quite a bit further with help from you guys.
We would love to get our hands on dead or terminally wounded heaters and components which we can take apart to photograph and reveal a few secrets. We still have a lot more to learn about the inner complexities of components such as fan motors, ECUs, burners and pumps. Also, our knowledge of some heaters could do with extending.
We are currently adding details of water heaters so donations of these would be welcome.
Dead heaters and components tell us a lot. Have a look at our Burner and Silencer autopsy pages and you will see what we mean - it clearly shows what has gone wrong - something we would not have seen with a good one.
If you have heaters or parts, excluding used screens and gaskets, which are unwanted or heading for the scrapheap, please get in touch and we can sort something out. We would expect to cover the carriage, but please contact us before you send it so we can choose a suitable carrier.
Thanks folks.

Model names.

Heating air path
Heating air inlet
Heating air impeller
Electronic control unit
Heat exchanger outer
Heated air outlet

Combustion air path
Combustion air inlet
Combustion air impeller
Glow pin and screen
Combustion chamber
Heat exchanger inner

Bottom center  Fuel inlet from pump.

You use any information and advice we give entirely at your own risk.
If you do not accept this do not use this site, go to an Eberspacher dealer.
We have tried to make it as accurate as we can but accept no liability for errors or problems caused by following our pages.
Some of the information is only suitable for people with a good aptitude for mechanical and electrical repairs.
Any DIY involves some risk of accidents and you must decide if you are capable and can do it safely before carrying out any work.
You should also ensure your DIY is done to a professional standard in order to avoid creating potential hazards and insurance invalidation. Boat installations must strictly comply with Marine regulations.

Hydronic water heater operation.

Hot water path
Water inlet
Heat exchanger outer
Heated water outlet

Combustion air path
Combustion air inlet
Combustion air impeller
Glow pin and screen
Combustion chamber
Heat exchanger inner

Top center  Fuel inlet from pump.

Fuel is pumped in tiny measured amounts into the Eberspacher.
It is mixed with the combustion air and burnt in the combustion chamber, the hot gasses pass through the inside of the heat exchanger before reaching the exhaust.
Water flows through the heater and is heated as it passes over the outside of the heat exchanger.
The water and fuel pumps are external to the heater on some heaters and are not shown in this model.

(Roy also uses this email address and phone number for initial contact.)