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Caleb BowersSep 12, 2025
Why is my American Standard Thermostat fan not running when set to ON?
- RRebekah ThomasSep 12, 2025
If your American Standard Thermostat fan is set to ON but not running, it could be because Humidity Control is engaged. If the indoor humidity is higher than the desired setpoint, the blower will cycle off with the equipment. A humidity icon will be displayed on the Fan Mode button when the blower operation is being inhibited due to high humidity. Alternatively, the blower motor may not be functioning, in which case you should check/repair the system.