How do I change the differential range?
Enter programming mode by pressing SET+ for more than 3 seconds until temperature unit LEDs start blinking. Then select and modify the ‘Hy’ parameter which sets the differential range between 0,1°C ÷ 25°C / 1°F ÷ 45°F. (Page 3)
From the official Dixell XR06CX Temperature Controller manual, page 3
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