- Joined
- 29 Mar 2008
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- 6
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After the hot water tap is turned off there is a noise from the boiler that lasts anything from a few seconds to several minutes. This only happens when the CH is also on. The noise sounds like it is a valve trying to open/close. The DHW and CH pressure differential valve diaphragms have both been checked and they are fine. Everything works as it should except this noise.