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Vaillant Ecomax 828 E?

I currently have central heating, but no hot water. The error code is E12. Does anyone know how to fix it?

Sarah
November 2010

Vaillant Heating, Home Heating Systems Hot Water Code

I have hot water but no heating unless I push the + & - buttons together error code is F30, help?

Linz
January 2011

E12 refers to water deficiency (same as E13), as you have not hot water but heating is ok, I would suggest your DHE is blocked, this would lock the boiler out as described.

Ignore the answer below, your boiler dosen't have a DHW diaphragm

Carefree
November 2010

dhw diaphram

deano
November 2010

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