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How do I remove the pump head so that I inspect and clean it? I know about the four screws on the flange, just not sure where and how to isolate the pump. Thanks

Ok, Thanks. Lived here a while now and the heating never gave any problems. The balance seemed good as all rad's were getting hot. Blockage is likely I guess. Thanks for trying to help.

I can feel some flow vibration when touching the plastic part of the pump Any other ideas?

Recently returned from holiday and we are getting a problem with our central heating. Whilst away the heating was left running but on a reduced heat and no hot water setting. The rad's upstairs get hot and a couple downsatirs get warm. If I turn all of the upstairs rad's off I can get each of...