I had a similar problem. Having bled a radiator the low pressure light came on, and would not go off despite repressurising the system.
Despite the pressure guage showing the water pressure at the right level, the pressure sensor light remained on. I could not find a manual online, but the flowchart and wiring diagram on the back of the boiler cover were invaluable.
Solution: I identified the yellow wires that connected the electrical unit to the water pressure sensor. With POWER OFF, pilot and CH on, front and bottom cover removed, and electrical unit hinged forward and down (by undoing retaining screw above) I could get to the pressure sensor behind the electrical unit. I disconnected the sensor (2 yellow wires) and (carefully) put the power on. The boiler fired. I then switched power off, reconnected yellow wires (tried both ways - there being no way to tell which yellow wire going to which connector) and the boiler now works fine. I assume the sensor needs to 'reset' by disconnecting it from the electrical unit?
Mark
December 2006