B & D Murkin
UK main importers for
Le Tonkinois varnish
Flexidisc sander
Le Tonkinois Varnish
Older Eberspacher Diesel Air Heater Models under 3KW
D1LCC,   also known as D1LC Compact

Servicing photos.

If you service a model we have not covered here we would like to incorporate the details and photos to help others.
We would need a full set of good or at least reasonable quality pictures and a description of each stage. Ideally photos should be high resolution as possible, on a cd or dvd if too big to send by email. We always acknowledge the source of such photos.

If your heater is really carboned up we would welcome detailed photos to add to our pages.
Photos of specific problems are also of interest.

Manufactured 1996*,  replaced by Airtronic D2 model 2003* but still being sold for several years after that.

Automatic settings      Boost   High   Med   Low   Standby.
Heat output                 2200   1800   1200   850    0  watts.
Fuel consumption        0.27    0.21    0.14   0.10    0   l/hr.
Power consumption        34      22       12      8      5   watts
Current 12v approx           3       2         1     0.8    0.8  amps
Current 12v start, glow pin on, 21 amps for up to 1½ minutes
Manufactured in 12 and 24 volt versions.
Length 360,  Width 125,  Height 133      mm.
Combustion air inlet pipe 20mm, Exhaust outlet pipe 24mm.

Spare parts availability   Good
Wiring connection details see Wiring page.
Full servicing information see D1LCC Service pages.
Fault finding information see Faults pages.
Manufactured from 1975* to 1989*.

Heat output                 1800  watts single heat setting
Fuel consumption         0.21   l/hr.
Power consumption        40   watts
Current 12v approx         3.5   amps
Current 12v start, glow pin on, 21 amps
Current 24v start, glow pin on, 21 amps (Uses same glowpin)
Manufactured in 12 and 24 volt versions.
Length 356,  Width 119,  Height 122      mm.
Combustion air input pipe 17mm, Exhaust outlet pipe 24mm.

Spare parts availability   Obsolete, parts running out.
Glowpins are sometimes listed on ebay.
Gasket available from dealers.
Servicing photos are on our servicing pages.


Here are some of the older Eberspacher air heater models with brief details.
* Dates are a general indication only, nearly all are very much best guesses as date information is not published.
The data is provided as a rough guide, check carefully with the official Eberspacher information if it is critical.
Models were produced in 12 or 24 volt versions.


My Eberspacher D1LCC heater on a mounting plate.
Heating air inlet left, Heated air outlet hood right.
Bottom:- Combustion air inlet, Fuel inlet, Exhaust outlet.
Manufactured  1989* to 1998*, replaced by D1LCC.

Automatic settings       High   Med   Low   Standby.
Heat output                 1800   1200   850     0  watts.
Fuel consumption         0.21   0.14   0.10    0   l/hr.
Power consumption        30       20      20    0   watts
Current 12v approx         2.5        2        2     0  amps
Current 12v start, glow pin on, 21 amps
Ventilation only mode.
Manufactured in 12 and 24 volt versions.
Length 360,  Width 132,  Height 139      mm.
Combustion air inlet pipe 22mm
Exhaust outlet pipe 24mm.
Early model air inlet pipe 20mm.

External ECU having 4 & 12 way connectors plus a relay means it is not as convenient to mount as D1LCC or D2 models. Relay and ECU should be mounted vertically.
The D1L can be mistaken for a D1LC or even a D1LCC, check carefully before buying a D1L by mistake.
The D1LC comes in 5 release versions, R0, R1, R2, R3, R4.
The number should be printed on the ECU.
One user has an R2 version which was dated 1991.
Only R3 and R4 versions have ECU locking.

Spare parts availability   Reasonably ok.
Gaskets, glowpin and screen same as D1LCC.
10 to 20 years old so getting towards end of Eberspacher support for items like ECU.
Servicing information generally similar to D1LCC.


Power connector and fuel pump on left, rheostat controller top. Controller cable joined in two places.
The exhaust port on this D1LCC is very badly corroded.

Photos Robert Wilcox
Eberspacher Models   D1LCC  D1LC  D1L  B2L   D2L  BN2
D1L  12 volt version with optional ventilation relay

D1L  24 volt version has an extra glowpin relay.
This loom also has the optional ventilation relay.
Top view with brown overheat reset button
D2 and D1L heaters size comparison, D2 uppermost.

Photos  Tim Claseman
Manufacturing dates not known. Often these were fitted to camper vans.
D2L and B2L heaters are obsolete and no longer supported by Eberspacher.
Single heat setting 2300 watts.
Battery power taken  start 240W, run 15W
Click here for photos of a disassembled B2L.
These heaters are very old, spare parts like gaskets are unlikely to be available.
Corroded and loose connections are worth checking if unit is faulty.
Glow pins may still be available.
Any other faults will probably be beyond economic repair, replace with a modern alternative.
The following forum article has photos of mounting a D2 in the same position, a new box will be needed to be made.

Manufactured pre 1969ish*
6 volt or 12 volt models.
2.3  Kw

This model is obsolete and is included just for general interest.
Really only suitable for Vintage vehicles.
They probably have a steel heat exchanger.
If so these must be replaced every 10 years as they are prone to stress fractures.

Photo  Vwkever   (Creative Commons license.)

Click here for more BN2 photos.
A very good heater if you don't go for an Airtronic D2.
I use one and find it as good as a D2 in operation.
Start current is double that of a D2 so thicker cables needed.
We understand there is a ventilation function but it is not documented in the manuals.
Ventilation mode is not compatible with modern controllers.
Not as easy to service as the D2, part of the heat exchanger cannot be reached for mechanical cleaning.
Gaskets glowpin and screen are readily available.
Servicing details are on the D1LCC service page.

D1LCC heaters sold on ebay were often from BT vans, by now these will be at least third hand. The loom is often butchered with connectors cut off and joins in the wires as shown here.
Label on heater rates heater at 1800W so possibly boost setting is only used during startup.
Confusingly sometimes users can call this heater a D1LC thinking that designation is sufficient to identify it, not realising the D1LC is an older model.
Distinguishing feature to look for when buying:-
The Electronic Control Unit (ECU) is fitted inside the heater case, with earlier models the ECU and relay(s) were external.

The diagnostics work with modern diagnosis equipment like 701 or 801 controllers.
There are also some simpler diagnostics built into the D1LC.
If you connect pin 4 and  pin 6 on the controller (yellow and black/white wires) together for between a half and two seconds the controller light should blink the fault codes.
Download this pdf for the details and the output codes.
See Controllers page  301 modulator for a circuit which shows the LED joined to the blue/white wire.

One manual quotes on test fan speeds  800  3000  4500 rpm.
Flame sensor 900 -1100 ohm cold, up to 2200 ohm heat exchanger warm.

Most D1LCs will go on for many years, just needing an occasional service to keep them running.
These heaters are quite old and they are approaching the end of Eberspacher support.
If they do fail and the fault is not simple to fix it is probably a good time to consider replacement.
One source says ventilation mode was a special for UK versions, this is not true, all have this mode.

Very basic heater, single speed on / off operation.
Over 20 years old.
Some have a ventilation option.
Usually fitted with an 'on/off' type thermostat controller. This heater is not compatible with the rheostat or more modern controllers.
Inlet and exhaust on this model must be the same length.
External ECU having 2 & 6 way connectors and a motor fuse.
An overheat sensor under the rubber bung shuts off heater if it overheats, has to be pressed to reset.

Unsophisticated control, pump starts at same time as glowpin.
24 volt model has an extra glowpin relay.
The glowpin screen is not replaceable on this model.
Photos of the ECU out of the case are on the ECU dismantle page.
If faulty and fault is not simply fixed it is probably beyond economic repair, replace with modern version.

Click on images for better quality.
12 volt D1Ls have none or one relay.
24 volt D1Ls have one or two relays.
The optional relay provides a ventilation setting.
Both looms below have this relay.
Photos John Buckley
Corrosion and bad joints on the D1LC printed circuit board are a common problem
and this printed circuit board has been repaired with wire links.
The connections between the 12 pin connector and the pcb are often the cause.

These heaters are bought because they are cheaper than later models.
Sometimes users buy D1Ls without ECU and pump etc, a very bad decision. My advice then is it is cheaper to throw it away and buy a more modern version than to get the missing parts.

Personal opinion
Would I fit one in my van?  No.
Fan and heater runs at full speed so noise level does not reduce like multi-speed models.
Single heat setting means heater has to switch on & off regularly to maintain temperature. The resulting temperature variation will subjectively be high so you alternatively hot and then shivering.
Each restart draws high glowpin current. This combined with current draw of 3.5 amps when operating means battery will become flat a lot quicker than later models.

Later models are a far more sensible option.