Timeguard ETU17 - Manual (Page 10)

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8. Self Cancelling Override:
To change the output status from ON to OFF or vice versa press the
button whilst in normal operating mode. The output
status will change and indicate override is in operation by flashing
either the ON or OFF symbol on the display. The override will end at
the next programmed change, or sooner, if the button is
pressed again.
9. Random Operation:
By pressing the for around three seconds whilst in normal
operating mode a small R appears on the display. The ETU17 will
now switch ON and OFF in a random fashion during programmed
ON periods. Both the ON and the OFF periods will vary in a random
way between 10 and 31 minutes. Normal switching can be restored
by pressing the button for around three seconds until the
R symbol reappears.
10. Operation:
Plug the ETU17 into a 13A socket and switch ON if necessary. Plug in
the appliance or lamp(s) to be controlled into the ETU17 and ensure
the appliance or lamp(s) are switched ON.