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how to fix my valliant combi boiler?

i have a vailliant eco max combi boiler it gives us hot water no problem but when we turn the heating on it works for about 2mins then goes off and comes up with a fault saying pump over run has any body got any ideas plz
chris, September 2008
Is your heating circuit heating up ? if not then the diverter valve is not opening which will cause the overrun to activate as there is no circulation.

Engineer De Gaz, October 2008
link Click here to see other fixes for Vaillant ecoMAX.