Bryant air conditioner will not start at all; thermostat calls for cooling but neither indoor blower nor outdoor unit run.

Safety first: Turn off breakers before removing any panels. Use caution around live circuits.

Steps:

• 1. Check breakers and disconnects: Verify that the indoor air handler/furnace breaker and outdoor condenser breaker are ON. Reset if tripped once; if they trip again, stop and call a professional.
• 2. Confirm thermostat settings: Set thermostat to COOL and fan to AUTO, and lower the setpoint at least 3°F below room temperature. Replace thermostat batteries if applicable.
• 3. Inspect indoor unit: Remove the blower door. Many Bryant furnaces have a door switch; ensure the door is properly closed to engage it. Look for an LED on the control board; if dark, the transformer or board may be bad.
• 4. Check low-voltage fuse: Inspect the 3–5A fuse on the Bryant control board. Replace if blown; if it blows again, there is a short in the thermostat or outdoor wiring.
• 5. If still no operation: The transformer, thermostat, or control board may need replacement. This should be done by a qualified technician.