Bryant system logs code 67; indicates low outdoor ambient lockout or low temperature operation fault. System may not run in very low outdoor temperatures.

Safety first: None beyond normal precautions; this is a control/operating condition, not a high-voltage fault.

Steps:

• 1. Check outdoor temperature: Verify actual outdoor temperature. Many Bryant air conditioners are not designed to run below ~55°F without low-ambient kits.
• 2. Verify sensor reading: Compare the thermostat's displayed outdoor temperature to a reliable thermometer. If readings are far off, inspect and possibly replace the outdoor ambient sensor.
• 3. Confirm configuration: Ensure the thermostat and control board are configured for an air conditioner (not heat pump) and that any low-ambient lockout settings are appropriate.
• 4. Avoid low-temp cooling: Do not force the system to run in low ambient conditions; this can damage the compressor.