Shut off any hot radiators, and turn the pump on and off several times. Ensure the speed is set to three. This may force the airlock into the rads. IF this doesn't work you need to open up a coupling and allow a larger quantity of water to escape bringing the air with it.
Water circulating through the header tank introduces oxygen into the closed system. This will eventually cause corrosion to the rads and the resulting sludge can block both rads and pipework.
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by Cyclefleet » Wed Dec 03, 2008 12:04 am 
