Computherm Q7 Operating Instructions Manual page 42

buttons have successfully been locked, the notice " " appears
in place of the time characters for a couple of seconds. Until the
control buttons are locked, their normal function do not work; if any
button is pressed, then only the notice " " appears and nothing
else happens. To unlock press the and buttons together
and hold them down for at least 5 seconds. After unlocking the but-
tons, the notice " " appears in place of the time characters for a
couple of seconds, whereupon all the buttons can be used normally
again.
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