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tank which the expansion pipe goes in keeps filling up when central heating is on and over flowing why? can someone explain

can someone please tell me how to drain a central heating system and then re fill system :?

can some one help,please. when central heating prog comes on for hot water only,it heats up my rads.

iam going to do my inspection & testing in a few weeks, is there anyone who can email me past papers and exam papers or any information on the subject.

when the heating system fires up the upstairs rads r nice and hot but the downstairs rads are cold any one help