Honeywell TH400 User Manual
PRO TH40D / TH420D
Note: Make sure the thermostat is set
to the system you want to control (heat
or cool).
to the system you want to control (heat
or cool).
Press to permanently adjust temperature.
Press
HOLD to permanently adjust
the temperature. This will override
the temperature settings for all time
periods.
The “Hold” feature turns off the
program schedule and allows you to
adjust the thermostat manually, as
needed.
Whatever temperature you set will be
maintained 24 hours a day, until you
manually change it, or press
the temperature settings for all time
periods.
The “Hold” feature turns off the
program schedule and allows you to
adjust the thermostat manually, as
needed.
Whatever temperature you set will be
maintained 24 hours a day, until you
manually change it, or press
RUN to
cancel “Hold” and resume the program
schedule.
schedule.
Program schedule override (permanent)
Set To
AM
70
6:30
Hold
Set To
AM
75
6:30
Press to resume program schedule.