Jump to content

Carebbian old Webasto boat heater HL3003 41 looking for help


Recommended Posts

Hi All,

I am seeking help and information re:my Carebbian cruiser 39ft,  looking for help with an old Webasto boat heater HL3003 41. Please find phot's below.

I bought this heater for my boat, the seller stated it was in working order.

This is the type of heater that was in my boat when new, all the fittings are present in  my boat, but I never had the heater itself.

Anyway we have tried to run it on a bench but got no joy, wondering if any members know how to set it up on a bench to test it, we have tryed but a relay was a bit ifi,.....so we fitted on from a car. Also how to service it. All help is most welcome.














Link to comment
Share on other sites

Hi David. On your bench test, did you hear the fuel pump clicking away?

If yes, did fuel get through to the heater? Disconnect the pipe from the

'heater' side of the pump and see if it pumps fuel out of it.

If there's any air in the fuel system, it generally will not start and

will need to be bled before it will. Even then, it may need to be started

several times before it bleeds the system inside the heater.

Is the battery you are using up to the job? It needs a huge amount of

power to get those things started! When I did mine at home, I had to

connect the charger to the battery to deliver enough charge to start it.

Any further info you can supply would help with the diognosis.

  • Like 1
Link to comment
Share on other sites

Wow, it looks like something someone pulled out of my bin 20 years ago!

Check there is power to the glow plug and that the glow plug works.

Unless you have plenty of power going to the glow plug it probably wont start,


the subsequent 2 models to this are now obsolete so I guess most spares will be unavailable.

  • Like 2
Link to comment
Share on other sites

Thanks so much and cheersBuffaloBill,, Alan, and Clive!


BuffaloBill re: "did you hear the fuel pump clicking away?" from memory yes, we will try a bench test again, we will see, you have made some good points, will update you when I get a chance to test it....Big THANKS!!!

Clive re:"power to the glow plug" from memory we had power, I remember it hot and smooking.......THANKS!!!!

Kind regards


Link to comment
Share on other sites

Wow takes me back!


I remember one of these that worked well on a Bermuda - if I remember correctly its control was in the rear cabin on starboard side under the dresser.  I was told, though not sure if true they were designed originally for German Tanks.


Then there was the one in a Caribbean Major it worked as far as hot air, but not only were the vents in cabins 'sooty' but there was actual fine smoke(not thick more like when you burn some oil in a pan) a sort of haze inside the boat when running.  In order to prevent this we would open the engine cover up and take the step tread off of the first step just outside of the aft door.  

Something clearly was not right, my dad having found opening the above stopped the this haze thought it was a good enough 'fix' and never called the boatyard but reported it on our return. 


I also remember it might take a couple of winds and the wait for the ticking mechanism to get to full heat and hope the green light stayed on and it carried on. 


The Caribbean Major also had a very large gas heater in the saloon, filled with wire wool which would glow a lovely orange evenly.  It melted one of my mums slippers which was left too close. 


Those were the days.


By the way the Germans seem to enjoy playing with these.  Here is one urm in a box.



  • Like 1
Link to comment
Share on other sites

That one is in military green too, Robin!


I guess there's something to say for trying to keep things original, but I think the long term prognosis for your heater isn't good.


As has been said already, they need a huge amount of power to get going and spares will be thin on the ground. Servicing the item will almost certainly break seals/gaskets that may be unbotainable. 


I am certainly no expert on these old heaters (the last time I saw one was in Clive's bin!), but even HL32 units from the 90's are rarely cost effective for repairs.


Power, power and more power is the key to starting it and make sure you fully document all those cables as moving them around too much will break connections and where will you be it two break?

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Sponsors

    Norfolk Broads Network is run by volunteers - You can help us run it by making a donation

  • Create New...

Important Information

For details of our Guidelines, please take a look at the Terms of Use here.