The pilot light does not ignite when the heating is put on or the hot water is run.

Jez Clark, December 2008

This helped. Mine wasn't a red switch/button. It was small on a vertical pipe. It was a small reset button which had 2 wire also connecting to it. Left hand side.

Thanks

CJ, October 2010

If the pressure in your boiler has gone below about 0.5 bar then your boiler might have gone to lockout.
You will need to reset boiler, this can be done by removing the boiler outer cover. Then look for a sensor on the left side of boiler (look carefully) you will see a small red button on the upper sensor. Press this and see if your boiler now works.
Good luck...

M, December 2008