As we set off on Thurs I put the webasto heating on but around 15 min later I heard the fan cooling down noise come on. When I stopped 2hrs later I noticed the fault knob flashing 10 times. Used the heating yesterday for about an hr and half and it seemed fine. Turned it on today again and after an hr its cut out again with the same 10 flash overheating code. Can anyone tell me what I should be trying to do to fix this please.