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How to Fix F22 problem on Eco Tech plus 630?

Our hot water has stopped working. The Boiler has a flashing message to say F:22. Safety switch off - low-water pressure.
Does anyone knowhow i fix this?
Gwyther Debbie, June 2016
Plenty of ways to do that here:

http://tinyurl.com/zr2pjwo

Anon, June 2016