Payne air conditioner displays E6; system may not respond to thermostat commands or may operate erratically.

Safety: Disconnect power to the system before opening any control panel.

• 1. Confirm model compatibility: Check the model numbers on the indoor air handler/furnace and outdoor condenser. Verify in the Payne installation manual that they are an approved match.
• 2. Inspect dip switches/jumpers: On the indoor control board, locate dip switches or jumpers that set tonnage, airflow, and staging. Compare their positions to the Payne installation instructions for your specific model combination. Correct any obvious mis-settings.
• 3. Reset control board: Some Payne boards allow a factory reset by moving a jumper or pressing a reset button (refer to the service manual). Perform a reset if available, then reconfigure as required.
• 4. Check thermostat programming: Ensure the thermostat is configured for the correct system type (conventional AC, heat pump, number of stages). Incorrect thermostat setup can cause communication faults.
• 5. Professional service: If E6 persists, the control board may have corrupted memory and require replacement by a technician who can also verify proper system configuration.