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F22 and F25 errors?

I have a glow-worm boiler only 8 months old and keep getting a F22 error and now F25 wish to know what these errors are, and what part of the boiler is affected
peter robertson, June 2013
Low water pressure/circulation issue

A1, June 2013
link Click here to see other fixes for Glow-worm F22/F25.