unless the air is gathering in a high spot, then being distributed round the system when the pump comes round, otherwise you would normaly get pipe knocking and stuff like that.
Pump, big thing on the main pipe coming out of the boiler usualy (depends on the system), it will be on some 22mm pipe (3/4" for older houses), bout 10cm in diameter and 10-15cm long, have an electrical wire coming from the control unit into it.
Graham, if you are unsure, British Gas do a home care policy, which is monthly (no 12month minimum) cost £12 for boiler, £16 for boiler and systems cover, per month. Let them do it.
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