What temperature range can I set for heating and cooling?
The acceptable temperature setting range for Heat is 40°F to 90°F (4.5°C to 32°C), and for Cool it is 50°F to 99°F (10°C to 37°C). If temperature settings do not change, make sure you are setting within these acceptable ranges. (Page 18)
From the official Honeywell TH6110D Programmable Digital Thermostat manual, page 18
Have a follow-up question?
Answers from the official manual.
Common questions