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Thanks Martin, This make more sense now as I've been told in the past that our pump may be on it's may out. It has three settings and is on the top setting. I stops pumping on the lower speeds. This isn't overflowing into the header tank, it's going outside the house. This is a bit of a...

Hi All, I've noticed that if I have the boiler thermostat turned up too high, (over 4 on a 1 to 6 scale) I seem to get an overflow from an expansion pipe that runs outside. Also, I'm sure I have to bleed one of the rads far more frequently as well. Once a week. Any idea what might be the...