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No hot water from Vaillant Turbomax 828E?

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 always the same!

Any ideas?

Gravesy
November 2006

Vaillant Heating, Home Heating Systems Vaillant 828e Boiler

i have a turbo max vum gb 242-5 turbo max plus 824e boiler&there is no hot water or heating.the green light is flashing and the message on the tempreture gage is f.22 or f.20.plz help.

Goshka
December 2006

It could be the fan proving switch then. This located at the back of the boiler and is accessible from the top right hand side. The switch is factory sealed so you can't really repair it but from experience, I have found that removing it and giving it a few gentle knocks with the back of a screwdriver, it may start working again. If this solves the problem, be prepared to replace the part soon as it will probably happen again.

John
November 2006

Thanks for your reply John. I have checked the heating flow pipe and it does not heat up.

The biggest issue I am having is the boiler fails to light up when drawing water even though the green light flashes indicating a demand for water.

Ben
November 2006

Open a hot water tap and if the boiler fires up, check the heating flow pipe (big one on the left) to see if it heats up. If it does, then it's the D/Valve again. There is a common problem with the D/Valve on this boiler.

John
November 2006