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Vaillant 824E DHW going hot & cold?

Hi,

I have a Vaillant 824E. When I turn on the hot water is comes hot for a few seconds then goes, luke warn then cold. I though it would be the temprature sensor which I just changed but no joy. When I turn the water on the burner keeps going on and off which is causing the water to go hot & cold. Anybody have any ideas.

Thanks Prav

Prav
December 2008

Vaillant Heating, Home Heating Systems Dhw Hot Cold

You're not alone. I have an 8 year old 824E that does the same thing - and it probably is the heat exchanger. How strong is your hot water pressure? Mine is very poor. Quite expensive replacement job; you may as well replace the boiler.

Simon
December 2008

DHW heat exchanger\plate heat exchanger is blocked scaled up.
either de scale it or replace it

justeve
December 2008

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