Don't touch it for 5mins, then go back and enter your code correctly.
If you get it wrong again, WAIT a couple of minutes then have another go.
EXAMPLE >>
If you enter 1235 instead of 1234, realise what you have done and re enter, the control panel sees what you have entered as 12351234, you try again & again eventually you end up with the 'rt' display & the panel locks.
The trick is patience.
acorn, March 2010