On the covered Honeywell Home T6 Pro Smart thermostat, alert 171 means set the Date and Time. The time and date on the thermostat need to be set so features like scheduling can operate. First, open the thermostat's date and time settings.
Differential
Likely causes of “Honeywell Home T6 Pro Smart thermostat alert 171”, and how to tell them apart
- 1
The clock was never set
What separates it A new install shows alert 171 from the first day
How to confirm Nothing else is wrong: the heating and cooling still run, but the program schedule has no time to follow
- 2
A power loss cleared the clock
What separates it The alert returns after the furnace breaker tripped or the batteries were swapped
How to confirm Set the time again; if it returns every few days, check the C wire or the batteries
Try in this order
0 of 4 completedWhat to do first
ReversibleOpen the thermostat's date and time settings.
Correct only the documented fault domain
ReversibleThe T6 Pro guide's action is to set the time and date on the thermostat, and it points to its date and time instructions on page 23.
Set the time
ReversiblePress Menu, use + or - to reach TIME, press Select, pick 12 or 24 hour, then set the hour and the minutes, pressing Select after each.
Set the date
ReversiblePress Menu, use + or - to reach DATE, press Select, then set the year, the month and the day in turn.
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Exact questions
Common questions
What does alert 171 mean on a Honeywell Home T6 Pro Smart thermostat?+
Set the Date and Time. The time and date on the thermostat need to be set so features like scheduling can operate.
Is alert 171 a fault?+
No. It is a reminder. The thermostat heats and cools without the date, but schedules and other time-based features cannot run until you set it.