What temperature ranges are acceptable for the Honeywell thermostat?
The TH6210U2001 thermostat has the following acceptable temperature ranges: Heating minimum setpoint of 40°F to maximum of 90°F (4.5°C to 32.0°C) and Cooling minimum setpoint of 50°F to maximum of 99°F (10.0°C to 37.0°C). The working ambient temperature range is 32°F to 120°F (0°C to 48.9°C), and the operating ambient temperature range is 37°F to 102°F (2.8°C to 38.9°C). If temperature settings will not change, verify they are within these acceptable ranges.
From the official Honeywell T6 Pro TH6210U2001 Thermostat manual, page 12
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