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    Viessman Vitodens 100 with Santon cylinder - no hot water

    I have the Viessman wireless controller for the boiler. The HW demand light comes on on the programmer and the boiler. The wireless connection is working OK.
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    Viessman Vitodens 100 with Santon cylinder - no hot water

  3. D

    Viessman Vitodens 100 with Santon cylinder - no hot water

    thanks That was my hunch but both are new Honeywells. I've tested them out by reducing the water temp on the cylinder and the HW valve changes position. Other than that I'm pretty short on ideas of how to test an electrical fault. Are you suggesting that the valve is set to closed...
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    Viessman Vitodens 100 with Santon cylinder - no hot water

    Hello, I have a newly installed Vitodens 100 (35kw) connected to a Sandon 210 indirect cylinder. I noticed yesterday that we had no hot water and when I switched to manual HW - even though the boiler light for hot water demand came on - the boiler didn't fire. i'm pretty competent around the...
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