You can find a manual by Googling Worcester Bosch 24i - it comes as a PDF.
You are supposed to be able to light the pilot by turning the temp control knob to max. First check the pressure is OK and the power is switched on.
However if this does not work you may be locked out and need to press reset. This is where I am also stuck....one of the buttons on the top is supposed to be a reset button but as you say they do not depress....
Good luck anyway :-)
Gabe
March 2007