hi all, iv recently bought a house and am having a problem with the boiler. it is a halstead eden sb condensing boiler. it is a newly fitted boiler and hardly been used. the house has been empty for 2 years and boiler not been in use. when i turn boiler on the display panel flashes red and "F2" is shown. iv had a couple of plumbers round who are lost on this. the company have sent me a maintenance manual but it doesn,t have anything in it about "F2"............. any help would be much appreciated.. thanks