What are the temperature setting ranges for heating and cooling?
The heating temperature setting range is 40°F to 90°F (4.5°C to 32°C), and the cooling temperature setting range is 50°F to 99°F (10°C to 37°C). If temperature settings do not change, verify that you are setting them within these ranges. (Page 8)
From the official Honeywell TH5110D Home Programmable Thermostat manual, page 8
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