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The main control board behind the fire will be at fault, almost certainly the 500w relay is stuck on. So apart from this preventing the control switch switching it off, this will also prevent it working on higher settings.
As for the air distribution, due to the natural airflow coming off the fan, most of the air wants to exit from the right hand vent. If then this is the toilet vent, then trying to change the flow mostly to the left hand vent creates a lot of turbulence rather than improving the flow to other parts of the van.
Solution then is to change the longest ducting pipe to the right hand vent
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Topic: Trauma Heating
