webasto.... again. Sorry, long post!

[Kevin Erion]

Adam, my 99 Marathon had that same set up with the solenoid valves. Leon told me that they had some problems with those valves and to take them apart and gut them. I took a look and it had already been done, I just took them out and put ball valves in. no guessing on those, just open and shut and you don't need to mess with them anyway.

[adamdegraff]

Fiddleman,

Be careful communing with God in Yellowstone, you may have snow higher than your coach before your done.

John

Ohhhh, Yellowstone is gorgeous! It was almost 60 degrees when we pulled in. Beautiful weather. Now, at 9:30PM it is down to 47. Not bad. Hope it stays this nice all weekend.

Thanks, everybody, for the webasto suggestions. I'll figure it out at some point. In the mean time, if anybody comes up with the answer to why it works under certain conditions, pray tell, the mystery is killing me:-).

~Adam

[Steve Bennett]

Adam, we had kind of a similar issue with ours. My Webasto would work fine on 12V heat, but would not fire and run on 12V water heater. It turned out we had a bad Diode on the relay panel. If you gain access to your relay board check to see if it has a Diode between your Webasto block heater & 12V heat. The Diode we had originally looked OK, but when I touched it, it fell apart. I found this problem after we replaced the high temp sensor, and quite a few other components on the Webasto unit itself. Well at least I have more spares.