Honeywell T1 Pro User Manual

3
Batteries are optional (to provide backup power) if your thermostat was wired to
run on AC power when installed. If your thermostat was not wired to run on AC
power, then batteries are required.
Install fresh batteries immediately when the low battery icon appears. The icon
appears about two months before the batteries are depleted.
Even if the low battery icon does not appear, you should replace batteries once a
year, or before leaving home for more than a month.
NOTE: When replacing batteries, alkaline batteries are recommended.
Battery replacement
When the low battery
warning appears, press
gently to loosen the
thermostat and then
carefully pull it from
the wall mount.
Insert fresh alkaline AA
batteries and reinstall
thermostat.
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Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions. Most
problems can be corrected quickly and easily.
Display is blank • Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed (see
above).
Heating or
cooling system
does not
respond
• Press Mode button to set system Heat (see page 2). Make sure
the desired temperature is set higher than the inside temperature.
• Press Mode button to set system Cool (see page 2). Make sure
the desired temperature is set lower than the inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
Temperature
settings do not
change
• If you are in the correct mode, but you cannot set the heat from
32 °F to 90 °F (0 °C to 32 °C), or set the cool from 50 °F to 99 °F
(10 °C to 37 °C), you may have range-stops restricting your
setting. Check with the installer to see if they set range-stops.
“Cool On” or
“Heat On” is
flashing
• Compressor protection feature is engaged. Wait 5 minutes for the
system to restart safely, without damage to the compressor (see
page 2).

Honeywell T1 Pro Specifications

General

Model	T1 Pro
Programmable	Non-programmable
Power Source	Battery or Hardwired
Stages	1 Heat/1 Cool
Changeover	Manual
Geofencing	No
Remote Control	No
Warranty	1-Year Limited Warranty
Temperature Range	Heat 40-90 °F, Cool 50-99 °F
Display Type	LCD
Compatibility	Compatible with most single-stage heating, cooling, and heat pump systems