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Ok, so the water level in the header tank falls as water is let out of the system, and tops itself back up. Is it likely that there is a blockage near the boiler? As the pipes from the boiler get very hot very quickly and a boiling sound happen before the boiler switches itself off...

Excellent, will try that later!

Hi thanks for the reply. The pump seems to work ok when the boiler is running... i.e. it heats the top of the house. The header tank is full. How would I test if there is a blockage from the header tank? Thanks

Hi, I have been trying to solve this problem for a week now and the house is not 7 deg C. I have a Glow Worm back boiler - approx 10-15 years old, not sure of model because I'm at work. The problem is that the boiler stay on for approx 3 mins before the thermostat on the boiler cuts it...