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Thank you everyone for your rerplies. Will do as everyone suggsted, I'll keep you posted. Tony

When I first filled the system and restarted the boiler the display window showed the water temperature get very high very quickly u9 and then a square symbol flashing at it's diaginal corners. Since then it will run up to 75-80 dec and shut down until cool. Hot water side still running fine!

Just recently drained down the central heating system to fit a new radiator. Now that the system is filled back up again the the boiler seems reluctant to circulate hot water and shuts down until cool, where upon starts up again and so on. I have bled all the rads several times to no avail and...