Indoor unit displays E3 and outdoor unit does not run or stops shortly after starting

Safety: Turn OFF power at the outdoor disconnect and breaker before working near the condenser fan or electrical compartment.

• Step 1 – Check airflow: Ensure the outdoor unit (condenser) is not blocked by debris, plants, or covers. Maintain at least 2–3 feet clearance on all sides and clear the top.
• Step 2 – Clean condenser coil: Remove the top grille if needed. Using a garden hose on low pressure, rinse the coil from inside out to remove dirt. Do not bend fins. Let dry before restoring power.
• Step 3 – Inspect condenser fan: Confirm the fan spins freely by hand (power OFF). If stiff or noisy, the fan motor may be failing and causing high head pressure.
• Step 4 – Reset power: Restore power and run the system. If E3 returns quickly, shut it down to avoid compressor damage.
• Step 5 – Call a technician: High-pressure switch, refrigerant charge, and compressor current draw require gauges and meters. A Carrier technician should check for overcharge, non-condensables, or a failing compressor.