Boiler was in Stag Lane, Kingsbury London NW9. The radiators were making noices when heating was on. Also the radiators are not worming up properly. It was found that the primary pressure gauge was not working and stuck at zero pressure. It was not possible to measure and charge the system pressure. The pressure gauge was replaced and the system was recharged with new chemical inhibitor and noise reducer from sentinel. The heating problems were sorted out !
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