I'm having trouble getting my Webasto Thermo Top C to work.
I have successfully tested the unit in the past so I know that it does actually produce hot water.
But now I've installed it in the system it doesn't seem to want to run.
I starts up and goes thru its start up checks, making a lot of noise, pulling in lots of air and then shuts off after 2-3 minutes.
I did think it was the water not getting to the pump but I've swapped the pipes around a bit so I'm sure that there is water pressure enough get to the pump.
Any ideas of what it co