System error E517H on truma system

"the two most misunderstood settings on the Combi are Boost and Mix."

i really meant that there are a couple of areas of the unit which are a bit complex and take some in depth manual reading in order to get to the bottom of their ideosynchracies.😀

also, on Mix settings, as the van reaches temperature the gas portion throttles back gradually, eventually leaving the heating just on electric.

if the temp falls for whatever reason and electric alone cant respond sufficiently, then gas gradually kicks back in to support it.

this all happens automatically and there is no need for users to keep switching between gas (or mix) and then electric alone....which is a common reported occurrence.