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Vaillant ectotec Pro Mk1 boiler does not keep temperature

View the thread, titled "Vaillant ectotec Pro Mk1 boiler does not keep temperature" which is posted in Boiler Advice Forum on UK Plumbers Forums.

Vaillant Ecotec Pro MK 1 combined gas heater does not keep temperature when using shower or basin tap. Boiler heats up to 65C, then a few seconds later turns off and temp drops down to 54C. Have tried different temp settings but no joy. Any idea about possible defect/fault? I have short video showing the issue.
 
Could be the diverter, or as Shaun says a few things. A blocked plate ime usually the temp goes up to 80 degrees plus.
 
One thing you could try is isolating the cold inlet for the hot water under the boiler, run a hot outlet and see if water carries on running.
 

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