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what does the error code F1 mean?

My boiler is flashing an error code F1 and whilst it lights, it immediately goes out and I cannot get any hot water or heating
Carol, June 2012
????????????boiler make &model?????????????
???????????boiler make & model????????????
????????????boiler make & model????????????
????????????boiler make & model????????????
????????????boiler make & model????????????
????????????boiler make &model?????????????
???????????boiler make & model????????????
????????????boiler make & model????????????
????????????boiler make & model????????????
????????????boiler make & model????????????

manwithnoname, June 2012
NTC is defective ,may be wire is loose or broken,change both heating and hot water

ltd, June 2012