I have a Vaillant Ecomax 800 condensing boiler.

Joined
2 Nov 2008
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Devon
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United Kingdom
The problem is the heating system wont turn off even though the system is showing off, also the water is luke warm.
any suggestions.
 
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Sounds like the diverter valve stuck on ch for starters. This would cause the luke warm water.

I would get this sorted first then see what happens. Tackle one fault at a time, if there 'appears ' to be more than one.
 
252457 is the part you need, call Vaillant and they'll do it for £215 with a guarantee
 

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