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How can I get veirfy my radiators are operating properly?

MY Worcestero Bosch high flow 400 had not been working for the past month. Recently the Heat exchanger and pump were replaced along with other minor components. The system appeared to work but was slow to heat the radiators. (Hot water works well, finally). When the pump is operating it sound like a washing machine; like there may be air in the system; I venter all the radiators in the flat, but it doesn't appear to have any affect.
John, April 2009
After Venting have you refilled the System to 1-00 Bar?
On a Sealed System you have to ensure that the system is properly pressurised after venting is complete

Boiler. Repairman - Ipswich, April 2009
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