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boiler noise

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JOHN121254 | 21:50 Tue 09th Aug 2005 | How it Works
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I have a Potterton combi boiler (Lynx 2). Recently it has started making a huming noise when the heating is switched on. It starts after about 5 minutes of operation and gets louder and louder. It doesn't do it when heating the hot water. Has anyone any ideas what this could be.
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Avatar Image cyNick
Bleed your rads and re-pressurise the system. If that does not work, it's the circulation pump.
03:46 Wed 10th Aug 2005
Avatar Image Octavius
Yep, most likely to be the bearings in the pump
11:36 Fri 12th Aug 2005

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