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    Viessmann vitopend 100 - Hot water issue: water is only lukewarm on maximum

    Dear All, please help me. My Viessmann vitopend 100 has a hot warm issue. Yesterday we had hot water, but today it is lukewarm, and only on the maximum setting. If I reset it to medium, the flame does not come on. Has anyone ever had this problem? Which part do you think I should replace? Thank...
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