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F24 code on Honeywell Smartfit?

I have a code saying F24 on my Honeywell Smarfit, which is on the wall and controls the setting, timings for the boiler. What does it mean? How can I get rid of it? Does something need fixing.
It does interfere at all with the workings of it.

Any ideas?

Thanks

KJ
December 2010
HoneywellHoneywell SmartfitHeating, Home Heating SystemsHoneywell Controls Boiler

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