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The red indicator flashes '1999' or '9999'.

If '1999' flashes, this means that either no measurable signal is present (probe break) or the configuration under C111 is incorrect.
1. Check the measurement signal (resistance measurement, current/voltage measurement), if necessary, define values using a signal source.
2. Check configuration code C111 (default setting Pt100, Chapter 7.1 of the Operating Instructions).