Outdoor unit attempts to start, then shuts down with E3 indication, compressor is hot to the touch

Safety first: Disconnect power at the outdoor disconnect. The compressor and refrigerant lines can be extremely hot—avoid contact.

Steps:

• 1. Verify condenser fan operation: With power restored and a call for cooling, confirm the fan starts immediately and spins freely. If it hums, starts slowly, or does not run, suspect the fan motor or its capacitor.
• 2. Clean condenser coil thoroughly: Remove top grille and rinse the coil from inside out with water. For heavy buildup, use a non-acidic coil cleaner following label directions. Reassemble after rinsing.
• 3. Check for airflow obstructions: Ensure no covers, shrubs, or fences are blocking discharge air from the top of the unit.
• 4. Allow compressor to cool: Turn system off for at least 1 hour to let the internal overload reset. Then restart and monitor operation.
• 5. If E3 recurs quickly: The system may be overcharged, contaminated, or the compressor may be failing internally. These conditions require professional diagnosis with gauges and amp measurements.