your pump is probabily on its way out, so probabily need a new one
mac
December 2009
shut off your valves on your rads upstairs and bleed the ones downstairs remembering that if its a combi you will need to repressurise the system through your filling loop.if its gravity feed it will replenish itself through the slave tank which will be a small tank next to your cold water tank
mark
December 2009
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