Webasto Heater Problem. Help?...

make sure nothing has gotten sucked up and is blocking the intake. Also, some of them don't want to operate correctly when fuel level gets below 1/4 tank and/or in side-to-side incline situations.

 

In the 4 trucks I have had, I have never had a satisfactorily working Webasto.

In my current truck, it really didn't do anything but give me a blinking light. Put it in the shop, and now it only blows ambient temp air.

Next home time the truck will be going back in the shop, hopefully to fix that (as well as other gremlin related ails).

 

need's to be rebuilt. we do our's every fall.

 

The flashing light is telling you what's wrong they use a flash code light the engine manufactures use. Count the flashes and go to http://www.techwebasto.com/heater_main/technical_publications_germany/Operation/776247.pdf and check it might just be a plugged filter they never get changed. Could still be a major repair like the fire box but check the easy stuff first.

 

PS> if you have a Air Top 2000 check this site for flash the previous posting was for a Air top 3500 http://www.techwebasto.com/heater_main/technical_publications_germany/Workshop/776891.pdf

 

Chances are the glow plug is carboned up and won't ignite the fuel. It's caused by not following the directions on shutdown. Webasto's IMO are crap. What is happening, the fuel is not being being burned when shut down. You have to let it go through it's shutdown cycle. The thing will shut off the fuel first, and continue to run with the glowplug energized, until the temperature drops, and then shuts down the fan. If it doesn't go through the shutdown cycle, everything quits at once, and the unburned fuel carbonizes on the plug. It's a pain in the butt when you want to get going at times. In my last truck with it, if you turned the key, it shut the thing down with out going thru it's cycle, poor design I thought. The only way I've seen them repaired is to replace the burner unit.
I've had Espars in other trucks, and they were programmed to run through the shutdown cycle when you started the engine. I never had one of them fail.
Check your exhaust pipe as well, it's that little flexible pipe dumping just behind and below your sleeper. Sometimes they get squashed or plugged. My money is on the glowplug though.

 

You can try twisting up some paper towels or newspapers, lighting them on fire and holding them down by the end of the exhaust tube. Some times enough heat will travel up the pipe to get it to ignite.

John Day is bang on when he referred to the glow plug. Glow plugs and fuel filters should be an annual occurence with these units.

 

You are getting a "no fire" and it is getting plenty of fuel, just won't ignite.

First you need to take the unit out and try cleaning it out with some carb cleaner. Try to get the carbon build-up out of it, without opening up the unit. Just make sure you let it sit and dry out for a few hours before trying to fire it again.

If that does not work, then you will need to get a gasket kit from a dealer and tear into it. It is quite simple to rebuild and you may need a new glow plug.

Mine did this every #### year