Its a pity there is no information about a graphite gasket under the burner, about if we could blow an air into ventury to clean it, no info of a vent maintanance, elektrodes. I just don't understand why there is a warning as if video was for a professional.
Absolutely garbage unit just like their bmw and mercedes cars ,I am installing navian for 14 years and never ever had to touch the burners ,works like a charm