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PostPosted: Sun Oct 16, 2011 10:51 pm 
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Hi everyone. Had boiler for almost 2 years. Recently drained 1 radiator to add inhibitor and after I've refilled the system, a DV started to leak out of the piston. Leaks only when piston is pressed, when CH is working. When pushed out, or in DHW mode,- it doesn't leak. It have had some sludge around the piston (don't know magnetic or not). The system in rads used to be dirty, but I've done chemical flush, then filled/drained for 4 times and since then have always had inhibitor in a system. It drained very clean this time as well. Is it possible to clean/repair the DV in this case? Part No. 178978 from Vaillant. And do I have to replace all 4 O-rings? :dunno:


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PostPosted: Sun Oct 16, 2011 11:14 pm 
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No idea, but logic would dictate that you replace all the rings/washers, whilst you have it in bits.


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PostPosted: Mon Oct 17, 2011 2:01 pm 
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Cannot be repaired. needs to be replaced.

Generall a DIYer is better replacing all seals/washers. A pro can often get away with no doing so ( rarely on some Worcesters! )



For this message the author Agile has received gratitude : manik10
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PostPosted: Mon Oct 17, 2011 4:07 pm 
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They're cheap enough that I usually just replace them :wink:

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PostPosted: Tue Oct 18, 2011 6:10 pm 
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Hi, thanks for reply. Vaillant confirmed-not a service item. But it's price varies from 80 to 140£. Trying to get cheaper and spend saved money on chemical cleaners or will fit Magnaclean Adey complete. Was really surprised it broke so quickly. I had impression Vaillant is at least for 2 years a hassle free boiler


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PostPosted: Tue Oct 18, 2011 7:19 pm 
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DV, water pressure sensor, pumps, expansion vessels, are all known problem areas for Vaillants. Their reputation is better than their products in many instances :dunno:

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www.drlgas.co.uk


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