Rheem mini‑split shows E5 and the outdoor unit does not start or stops shortly after starting.

Safety first: This fault involves high current and high voltage. Turn OFF the breaker and outdoor disconnect. Only proceed with basic visual checks unless you are trained.

• Visual inspection: Remove the outdoor panel. Look for burnt wiring, melted connectors, or scorch marks on the outdoor control board and compressor terminals.
• Check fan operation: Ensure the outdoor fan spins freely by hand. A seized fan motor can increase current draw. If stiff or noisy, the fan motor may need replacement.
• Verify supply voltage: With a multimeter and power restored (if you are qualified), confirm that line voltage matches the Rheem nameplate rating. Low or high voltage can trigger E5.
• Compressor test (advanced): With power off and wires removed from compressor terminals, measure resistance between terminals and to ground. Very low resistance or any continuity to ground indicates a shorted compressor.
• Next steps: If wiring and fan are good, E5 usually indicates a failing compressor or inverter module. These require a licensed HVAC technician for diagnosis and replacement.

Warning: Do not bypass overloads or fuses. Doing so can cause fire or catastrophic compressor failure.