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Thanks, Chris. The pump is only about 4 or 5 years old. Is there any way to check if it's OK or needs replacing? I phoned the IPHE technical helpline this afternoon and the man said that air is getting into my (vented) central heating system, probably from the header tank. When the air gets...

My pump makes a screeching noise sometimes. I turn the bleed screw on the pump and let some steam and hot water come out. The noise immediately reduces and then stops. What is causing the noise and how can I get rid of it? I love peace and quiet, so any help would be very gratefully received.