How do I lock and unlock the keyboard to prevent accidental changes?
To lock the keyboard, press and hold the up and down arrow keys together for more than 3 seconds until the 'OF' message is displayed. To unlock, press and hold the same two keys together for more than 3 seconds until the 'On' message is displayed. (Page 2)
From the official Dixell XR06CX Temperature Controller manual, page 2
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