Try recharging the expansion vessel. Climb up and look down the back of the boiler. You will see a tank with an ordinary schrader valve (car tyre valve). The tank can be pressurised to 0.5-1bar with a footpump. You will have to dump the system pressure by holding open the pressure relief valve when you do it. The valve is located inside the boiler on the right hand side under the pump and has a red twist head with 3bar written on it. The expansion vessel contains a rubber bladder and to pressurise it you need to pump out the surrounding water. Once done refill the system using the filling loop.
kenneth
October 2006
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