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Thank you Lightning & DP for your very swift replies. The filling loop is attached and seems OK. Last serviced about 18months ago, so could do with another !. Dave

Having had our boiler for 3 years and filled the system with water to bring up pressure numerous times, a problem has now occurred. When the boiler starts in the morning, water comes out of the overflow pipe. Any idea why ? and how can I rectify ?. Any help would be appreciated. Dave