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How to start the calibration process?

To be able to start calibration, activate the controller.
Start situation > Measuring mode > Repeatedly press the PGM key until CODE appears > Enter 0300 and confirm with PGM > Press the Exit key once > Simultaneously press the PGM + Down key.
A temperature of 25.0 appears in the top (red) display, °C appears in the bottom (green) display, the decimal point in the bottom display flashes. Refer to the operating instructions for the further procedure.