Webasto Tsl 17 Repair Manual

I installed a Webasto TSL17 in my B4 Passat and have had it running great for about 2 years now. Recently the unit has not been performing properly. I have not done any changes to the setup, so something has failed and I need some help to identify what. The unit will run the coolant circulation pump, and the combustion chamber fan on high for about one minute and then the unit will just shut off and nothing will be running except the minute count-down on the 7-day timer. The fuel pump is not audibly running during this process. The fuel pump does pump one time when connected to a 12v source.

Operating Instructions. Installation Instructions. Spare Parts Manual. TSL 17 Installation / Operation Manual. 101 Webasto TSL 17 Coolant Heater. Webasto Repair Parts: Deluxe Heater Kits: Olympia Boilers: Proheat Diesel Heaters: REAL Hydronic Air Handlers. L 8.43' x W 4.17' x H 6.61'. The TSL17SW-12 is the smallest water heater offered by Webasto and will heat up to a 38 foot sailboat or a 34 foot powerboat.

(I think this is the expected behavior.) The weird thing is that there is a constant 12v coming from the fuel pump wiring harness. I would have expected to see a on/off cycle of current to control the fuel pump. I have reset the unit by pulling the fuse, but the problem persists. I thought I read a thread on this forum about a unit with similar symptoms, but I cannot find it now and I do not remember the solution. Do any of you Webasto gurus have any suggestions?

Blowing the dust off this thread to post the solution so that maybe someone else can benefit. Three years later I finally fixed this by taking the unit apart and scraping the carbon out of the burner assembly. Be careful with the glow plug, scrape out the large deposits with a screwdriver or pick, and be mindful not to scrape the steel wool type substance at the bottom of the burner. I should have just taken it apart 3 years ago, but the voltage at the fuel pump thew me off the trail that it was actually a lack of combustion air to the burn chamber that was the problem. That sounds about right, I found mine would not work one very cold morning, It would start then shut off after a minute or so. Found out that the exhaust out put tube had snow packed up into it.

I had backed into the garage the nigth before (There was about a 6 in fresh snow fall) and shoved snow up into the exhaust tube where it froze up that night. So you will know to check that if it will not start and run correctly. I really miss having it in this 03, if the unit was not so high I would buy another but maybe when I get done remodeling my house I can but another heater. __________________ 2003 Jetta 216 injectors, race pipe, OMI, 2.5 cat back pipe, Sachs power clutch,Lightweight fly wheel,Rocketchip 3.0,Dieselgeek race pipe,Borla SS exhaust,Dieselgeek Intercooler pipes,Pierburg MAF,EU cluster with LED Boost gauge,, Ventectomy,Alientech window,Old Navy ccv filter,Catch can,Dieselgeek short shifter,ATE power slot rotors,Porterfield pads,Shine suspension,Shine rear sway bar,TT pedals & foot rest,Cat fuel filter 2 micron,Alum skid plate,Euro headlights and switch,5 Brake light mod.

Blowing the dust off this thread to post the solution so that maybe someone else can benefit. Three years later I finally fixed this by taking the unit apart and scraping the carbon out of the burner assembly.

Be careful with the glow plug, scrape out the large deposits with a screwdriver or pick, and be mindful not to scrape the steel wool type substance at the bottom of the burner. I should have just taken it apart 3 years ago, but the voltage at the fuel pump thew me off the trail that it was actually a lack of combustion air to the burn chamber that was the problem. Glad you were able to fix the unit. Well, since this thread comes up when I search the internet for how to fix my Webasto, I may as well update it with my latest update to share with the world. My method of scraping out the big chunks only seemed to get the unit to work a half dozen more times at most before it would stop again with the same symptoms I noted at the beginning of the thread.