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    CH Return Temp high, but Return pipe cold?

    Hi all, I have a Vaillant EcoTec 837 that is about 4 years old. HW operation is fine. CH operation isn't. I have the CH temp set to 75º. When there is a demand for CH, the pump starts, then seconds later the burner ignites and the Flow Temp starts to rise quickly. After approx. 20-30...
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