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I have had to replace a seized Grundos CH pump with a Wilo gold 50, the problem is that when I have tried to get the heating back on, after filling and venting the system I have no flow of hot water to my rads. The pump is running as I can hear the noise change when the speed is changed, inlet...

Hi, I have a hot water/central heating system that is generally ok when running, although there is some noise which seems to be the pump. The system is on a timer which goes off at 2130. Just recently, most mornings between 0100-0400 there is an intermittent noise that starts coming from the...