Sta-Rite digital pool pump attempts to start, then shuts down with E03 on the display.

Safety first: Turn off the breaker and lock it out if possible. Verify the pump cannot start unexpectedly.

• Check for hydraulic blockage: Close valves, remove the pump lid, and inspect the Sta-Rite pump basket and volute for debris (leaves, stones, toys). Clear all obstructions and ensure the basket is intact and seated properly.
• Spin the motor shaft: With power off, remove the rear motor cover or fan shroud and try to rotate the shaft by hand. It should turn smoothly. If it is stiff or frozen, the motor bearings or impeller may be seized.
• Inspect impeller: Disconnect unions, remove the pump housing bolts, and separate the wet end. Check the Sta-Rite impeller for wrapped debris or melted plastic. Clean or replace the impeller if damaged.
• Check for blocked plumbing: Ensure suction and return valves are open. Backwash or clean the Sta-Rite filter (cartridge or sand) to reduce system pressure.
• Test again: Reassemble, restore power, and restart the pump. If E03 persists with free-spinning shaft and clear plumbing, the motor windings or drive may be failing and should be tested by a technician.