Honeywell TH4000 Series - Quick Reference to Controls and Display; Display Screen Elements; Fan Switch Function; System Switch Function

Fan Switch (see page 8)
On: Fan runs continuously.
Auto: Fan runs only when the heating or cooling system is on.
Set: Press to set time/day/ schedule.
Hold: Press to override programmed temperature control.
Run: Press to resume program schedule.
System switch (see page 7)
Cool: Cooling system control.
Off: All systems off.
Heat: Heating system control.
Em Heat: Emergency & Auxiliary Heat control. The compressor is locked out. (Select models only.)
A quick reference to display screen
Set the time and day
Press SET, then adjust the time.