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Vaillant ecoMax boiler - no hot water?

Getting CH and checked CH pipes after running hot tap to check if it was valve problem. Nothing! Could it be a pressure thing? Really annoyed, Please help : /
Georgina, June 2008
if its not firing when tap is opened, and fires on demand for ch, it is the dhw flow switch that is either scaled up or failed

T, June 2008
link Click here to see other fixes for Vaillant.