What are the acceptable temperature ranges for heating and cooling settings?
Heat settings must be between 40°F to 90°F (4.5°C to 32.0°C). Cool settings must be between 50°F to 99°F (10.0°C to 37.0°C). If temperature settings are not changing, verify they are within these acceptable ranges.
From the official Honeywell T6 Pro Smart Thermostat manual, page 8
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