Below are a few resources on how to remove the burner and clean the combustion side of the heat exchanger on Vitodens 100 and 200 series boilers. This should be done yearly to maintain efficiency and longevity of parts. After cleaning the heat exchanger surface, be sure to clean out the internal condensate trap as debris will fill and clog it. Backed up condensate will cause burner faults and the refractory plates will fail prematurely, causing further issues and cost for the owner.

Recommended equipment: Viessmann HX cleaning tool 7858492, Axiom Clean F Steel cleaner AXTH-CFSTEEL-1L (or CitriSurf 77), a nylon brush (non-metallic only), and water to flush after cleaning. A Viessmann service tool kit 7725667 makes disassembling the boiler easier, but is not required.