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How can I fix my Vaillant boiler Turbo max plus 824E?

After switching off boiler ( to remove radiator) and re - filling via the filling loop, the hot water is intermittent. When the yellow light comes on, hot water sometimes works but more often does not. Keeps reverting to flashing green light.
Fault code F64 is showing. Any advice?
Jane, August 2008
Have you bled the system

atozbs(at)yahoo(dot)co, May 2010
Hi there
You need to call an engineer boiler needs adjusting internally.I'm a gas engineer.

ron, August 2008
link Click here to see other fixes for Vaillant.