I have one of these installed under my van as per another thread, however, since it being installed I have noted that the black control unit (the one with the rotary dials) keeps registering a fault. Ultimately the red led light flashes 3 times, which indicates that the battery voltage is either below 10V or above 14.8V. From what I could tell the system only seemed to be going into fault after driving. Having spoken with a couple of companies at CamperJam this weekend I had a bit of a closer look, and ran some tests. By pulling the fuse out of my leisure 12V circuits fuse board, effectively isolating the heater, then running the engine/ stopping it, replacing the fuse, the heater never goes into this Voltage fault mode. Sun is still powering the solar, battery voltage up around 14V, all is fine. So conclusion. The heater is seeing the spike created by the intelligent alternator, and isolating itself for safety. The way around this, either drive without the fuse in and just replace it when you get where you are going, or fit an in-line switch in the 12V supply to the heater to isolate it when not in use. I have called Propex Leisure in Ringwood Dorset, who make the units to feed this information back to them. They hadn’t got a clue, no doubt don’t understand the vehicles they fit these units to. But I asked them to make a note and add it to their files. Won’t hold my breath. So if you have a Propex LPG heater in your T6, you may want to fit an isolating switch (i’m just going to use a standard single unipolar CBE switch - with led to remind me that i’ve not isolated it!). Because it is a pain in the botty trying to clear the fault and takes a lot of messing around, as pulling the fuse at that point doesn’t work. Be interested to hear if anyone else with a Propex Heater has found this issue.