5
Adaptive Intelligent Recovery
Over time, the Honeywell T6 Pro Thermostat “learns” how long it takes your 
system to reach the temperature you want. It turns on the heating or cooling 
system earlier to make sure you’re comfortable at the time you expect. 
Damage can occur if the compressor is 
restarted too soon after shutdown. This 
feature forces the compressor to wait for a few 
minutes before restarting.
During the wait time, the display will flash 
the message Cool On (or Heat On if you have 
a heat pump). When the safe wait time has 
elapsed, the message stops flashing and the 
compressor turns on.
Built-in compressor protection
Message flashes until safe 
restart time has elapsed.
Adjusting keypad lockout
1  Press Menu on the thermostat. 
2  Press   or   to go to LOCK. Press Select.
3  Press   or   to go to OFF, PART, or ON, and then press Select. 
OFF: Unlocked, and full access allowed. 
PART: Partial lockout, allowing only the temperature to be changed. 
ON: No access allowed.
4  To unlock the keypad, press the CENTER button and then enter the password 
“1234”. To enter the password, press 
 or    to change the first digit of the 
number. Then press Select. Repeat this process to enter the second through 
fourth digits of the number. Once all four numbers have been entered, press 
Select again.
5  This will unlock the keypad.
6  If the code is incorrect, the screen will flash the lines "--".
7  Press Back to go back a step to enter the correct number and press Select.