The light on my Potterton Suprima 60 (don't laugh) boiler occasionally goes red and stays red i.e it is a lock-out and I understand that this is a common fault! Then it frees itself and frees up and the little green light comes on and all is well. However when the green light comes on, I turn the switch for the heaters to fire up - but they don't, irrespective of whether it's a red light or a green one ..... so does this lock-out stop the radiators coming on by messing up the three way valve or have I got a a red/green light fault AND a 3-way valve fault?