Viessmann boiler control has two levels of parameters that can be set, level 1 and level 2, but level 2 seems to be almost identical to level 1. What is the purpose of the level2 control options?
Viessmann boiler control has two levels of parameters that can be set, level 1 and level 2, but level 2 seems to be almost identical to level 1. What is the purpose of the level2 control options?
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