This operation is only available when UV lamp duration time is set. Configuration menu item 18 explains the way for
inquiry for the UV lamp duration time.
Press CLEAN DISPLAY to lock the screen for cleaning.
The screen will remain locked for 30 seconds so you
can clean the screen without changing any setting.
After 30 seconds, press DONE to resume normal
operation, or press CLEAN DISPLAY again if you
require more time for cleaning.
Note: Do not spray any liquid directly on the thermostat.
Spray liquids onto a cloth, then use the damp cloth to
clean the screen. Use water or household glass cleaner.
Screen lock timer
(count back 30 seconds)