I have just had a rad changed and a new rad added in our newly converted loft. Since this change, our water has been running hot then cold? I have a funny feeling it has air trapped in the system. I have blead all the rads but yet the problem still persists. Bar is at 1.2.

What can i do to clear the air in the system, if it is this?

ihatemyboiler, March 2009

if it's a linea 24 or 28, what you could do to test it yourself is with the hot tap open and the burner ignited, watch the burner through the inspection glass and when the burner goes out and the water still running from the tap than quickly turn off the cold feed to the boiler (black leve moves anti-clockwise to the 9 o'clock position) the led display will then display a temperature in excess 90degrees - if it does then your plate hat ecxhanger is blocked.

Big A, March 2009