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Thank you for the reply and good to know for the future. I have examined the situation further and actually I think the issue is with the water system now following the bathroom refit and not the radiator. Occasionally if using the water supply - a loud whistling sound appears - it may be in the...

As part of a bathroom refurbishment, our installers fitted a new radiator. Since then we have noticed significant whistling in our central heating system (not on start up of the system). I have bled the radiators (air was in one radiator only but no further air released in subsequent bleeding)...