Hi. I have the above the above boiler and am trying to turn the temperature control from 'E' to 'Max'. However the control does not turn that far. It feels like it is being blocked by something, even though the instructions say i can turn it up that far. There is a little round yellow thing on the control which I thought might be some sort of safety lock but I cannot remove it or turn it. The hot water control can easily turn to max. Any ideas what I need to do to turn up the central heating control? Thanks in advance.
Kevin.
Kevin.
