Honeywell T8090A/191108A Owner's Manual page 13

Start Or End Programs With Manual Program
Advance Button
To prevent damage to the program
IMPORTANT:
advance mechanism, DO NOT use the
program advance button within a 30-minute
period before or after a program change.
The manual program advance button
enables immediate, one-time-only program
changes to accommodate temporary schedule
changes.
Press the button to immediately begin an
energy savings period or return to the normal
setting. After pressing the button, check the
program indicator to ensure the system is in
the desired mode. If the program indicator
shows blue, the lower temperature is in effect;
if it shows red, the higher temperature is in
effect. Using the manual advance button will
not affect the stored program.
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