"Gravesy" wrote in message
oups.com...
I am having problems drawing hot water from my Vaillant Turbomax
boiler. Sometimes it will be fine but most of the time it takes an age,
if at all, to get any hot water through.

The diverter valve was replaced at the beginning of the year so I do
not think it is this. The central heating is fine.

The green demand light flashes but the boiler does not fire up. It
makes no difference if the heating is on or off, it is alwyas the same!

Any ideas?

Have you interrogated it for the fault codes? Look in your manual.
I take it it has an LCD display.

Andy.