Dimplex SPF1808L-IR Owner's Manual page 10

Operation
UP/DOWN Buttons
These buttons are used to adjust heater, timer and flame settings.
Child Lock Enable & Disable:
When the fireplace is ON, press and hold the Power ON/OFF Button on
the fireplace for 10 seconds. Three beeps and flashing 'E3' indicate that
the Child Lock function is activated. The Mode, Up or Down buttons will
not operate and 'E3' will be displayed when pressed. The power ON/OFF
button will also not operate, but only beeps will indicate that the child lock
has been activated.
To disable the Child Lock, again press and hold the Power ON/OFF
Button for 10 seconds.
! NOTE: This function can only be done through the fireplace controls, not
using the remote control.
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