Hi, I have a Vaillant TURBOmax VUW 242/1E combi boiler. Recently the instant hot water has stopped working. Central heating is fine, but when I run the hot tap (upstairs and down) the boiler just doesn't react. It doesn't try and ignite or anything. Any clues??
Most likey problem is the diverter valve, not energising fully. This in turn will not move the little plastic lever arm that actuates the microswitch on the side, sending the signal to ignite.
You can buy a diaghram kit from most local plumb centres, you need to replace the diaghram and seals, don't forget the silicon grease to ensure the plunger doesnt stick. Kits less than a tenner.
You should have noticed before it stopped working completely the water had reduced in temperature before the weeks it failed.
To make sure it is a diverter valve fault, depress the microswitch if you can, when the hot water is flowing and hey presto the demand for hot water light should shine.
Hi
Should work for short term but it will eventually stop when the arm doesnt move anymore.
When it does here is a good web page to show you just what to do.
http://www.plumbingwoes.co.uk/vaillant%2...
got similar problem hot water works intermitantly and c/heating pressure drops now and then. new diverter valve fitted a year ago?
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Have a vailiant combi have no hot water.had new heat exchanger put on and diverter valve is 2 years old.heating is fine what could be problem
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Hi there.. Any luck on the problem? I have the same problem now.. Thanks in advance.
Thanks for the advice!! I actually had a mate of mine come around and have a look - he diagnosed it as a the flow switch not making a connection.
To remedy this he packed the underside of the flow switch with a small piece of card - thus raising the contact of the switch slightly - and this worked a treat!! So i now have hot water again and spent absolutely no money at all.
Hope you find this helpful!!!
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