If the above method does not work, the LNB may have a fault.
Press the [SERVICES] button and then press    then [SELECT]
On Sky HD, press the [SERVICES] button and then press    then [SELECT]
Press the buttons in the sequence above exactly - do not atttempt to use [UP] or [DOWN]. Note that when you press the second 0 and 1 nothing happens on the screen until you press the final [SELECT]. This is a "hidden menu".
David Rose: Well you have certainly tried to correct the problem, as about the only possible reasons left are either your dish having moved slightly out of alignment, or alternatively the LNB having failed, if not indeed the box itself!
Would appreciate an update on the outcome of the engineers visit.
I had a spare satellitedish which I moved to 19.2 to get European stations. When the lnb packed up I found an offer of a new twin offset lnb at the same price as a normal one. I didn't know that my dish was too small but fitted it anyway. The 19.2 signal was improved in both quality and strength . I have just retuned the box and now find that I am getting not only 19.2 but the majority of 28 programmes. Is this an anomaly (I live in Poole Dorset) or has something else changed.
Further to your article regarding loss of signal it may be useful to read the following comment.
I purchased a satellite kit which had all of the components necessary to receive free to air transmissions. At a later date I upgraded the receiver with a freesatbox and used the existing set up with the addition of a further cable to the new dual LNB.
The freesat box started to lose channels. I investigated and found that the original cable (which was only four years old) had perished on the inside due to inferior materials.
Other people must be having this problem. The kit was manufactured by Ross (it had a Ross box).