How can I fix the boiler it shows CON message and teperature 0. I have no hot water, tried to turn the heating on, but still doesnt work...please help

bobbie, September 2009

Bobbie ... I assume this has now been fixed? Can you tell me the cause and how it was corrected?

Many thanks, John

Jareus, March 2010

In the manual it explains 'con' as no communication to mainboard, connection error display mainboard.

On the display it just shows 0 on temperature and pressure and if I press 'Flame' button then it shows the error.

Any chance I can fix it?
thanks

bobbie, September 2009

I have not come across a CON message before, but from memory most Vaillant Fault codes are F**, and the display is flashing,

Does the user manual give any indication of what this is? it could be Connection error, such as phase & neutral reversed or similar?

Check your Controls are correctly set as well

then call an Engineer

www.elanar.co.uk, September 2009