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Insinkerator boiling water tap vent leakage

Joined
17 Nov 2010
Messages
28
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0
Location
Oxfordshire
Country
United Kingdom
Hi,

I have an Insinkerator 4in1 boiling water tap which started leaking water from the mixer block when the boiling water tap was in use. The tap was installed in around 2018 and so I decided to try and descale the tank, hoping this would cure the issue.

I filled the tank with vinegar and a lot of scale and other debris came out when I drained it. I connected it all backup and the problem is actually worse! The basic issue seems to be that whenever the boiling water tap is in use, water constantly streams out of the vent pipe.

I removed the boiler again and opened up the case. The vent is actually attached to a small plastic tank which has an inlet on the bottom connected to the main tank cold water inlet. There seems to be a ball bearing or similar on this inlet which is (I guess) meant to block it off - at least that's what I'm guessing.

I'm currently not convinced buying a replacement NeoTank will solve the issue so am looking for some advice / thoughts on potential root causes. Does anybody know how this little plastic tank with its ball bearing is supposed to work under normal conditions?

Thanks!
 

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