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How can I reset my Valliant EcoTech plus combi boiler?

How can I reset my Valliant Eco-tech plus boiler after power and water has been off for a while. It was OK before but pressure seems low now and boiler is not operating when it should. I have no user manual. Can I get one anywhere?
Jean Horsley, February 2007
you can download the manuals from the vaillant website

Raj, February 2007
You need to repressurise the system using the filling loop, you may have a leak somewhere, have a look around rads etc for any leaks. Or have the radiators been bled and system not repressurised?

Bert, February 2007