my hot water system is making a horrible noise

Joined
21 Mar 2009
Messages
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Location
Isle of Wight
Country
United Kingdom
I have a gravity hot water system with a back boiler. The back boiler is working fine but a horrendous noise comes from my airing cupboard where the immersion heater is - it seems to be coming from a brass pump with a large cross headed screw in the middle.

Can anyone help
 
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