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How can I fix my Glowwarm combi heating. It keeps shutting down?

I have a glowwarm compact 100e combi boiler (not sure of age - inherited it with house). The problem is:
Within 1 hr after the heating starts the boiler shuts down. The overheating warning light comes on and the boiler is indeed quite hot. The water pressure rises from 0 (does not remain at the set 1.3 bar, and always returns to 0 when heating is off) to it's max then shuts down. Once the heating has been switched off for a couple of seconds the warning light disappears and it powers up again when switched back on.

Can anyone help?
Sam, March 2011
link Click here to see other fixes for Glowwarm Compact 100e.