DHW temp fluctuation with viessmann vitodens 100 combi

dawson6777 · 8 Nov 2011

Hi, I have a viessmann vitodens 100 condensing combi boiler. It has been fine until now. The water temp. when in the shower fluctuates, warm, then cold then back warm again. It repeats this until shower is turned off. I have metered the boiler temp sensor, and according to the book at 50 degrees should be around 4 k ohms. which it is.
Could it be the heat exchanger?

Dawson

adlplumbing · 8 Nov 2011

it could be catirage in your shower gone
if the hot tap is fine

diynot

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DHW temp fluctuation with viessmann vitodens 100 combi

dawson6777

adlplumbing

DIYnot Local

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