In the manual it shows only two times, and 10secs is not one of them. > 15 & 30secs.
Turn the mains off, open the panel, there will be a Tamper sound, enter your code, noise stops.
Above all the connections at the bottom of the circuit board, to the right of the tamper switch, there are a pair of switches, the left hand is the one you want.
You will find it in the upper position (15secs), flick it to the lower position (30secs)
Close control panel, enter your code to cancel the tamper notification & Fanny's your aunt!
Please post back HERE to let us know how you got on, it will help others in the future.
Good luck.
acorn, February 2013