The 3 heat settings all work fine, but the thermostat won't switch off. It's not a major problem as the 500W setting is usually enough to keep the van warm.
It would be an easy swop of the panel if that was where the fault was.
My question is should the thermostat switch like a normal mechanical switch? Testing on the 6 pin connector that comes from it none of the switches work like normal mechanical switches so I can't be sure if that's where the fault is.