Pump will not start, display shows E01 immediately when Start is pressed

Safety first: Turn off power at the pool sub‑panel and main breaker before opening any electrical box. Use a non‑contact voltage tester to confirm power is off.

• Verify supply voltage: Check the nameplate on the Pentair Sta‑Rite variable‑speed pump (e.g., IntelliPro VS‑SR) for rated voltage (typically 230V). With a multimeter and power on, measure line‑to‑line voltage at the pump disconnect or control box. If it is more than 10% below rating, the pump will fault with E01.
• Inspect wiring connections: Turn power back off. Open the pump wiring compartment or external control box. Tighten all line and ground lugs feeding the pump. Look for heat discoloration, melted insulation, or corrosion on terminals and replace damaged lugs or wire ends.
• Check wire gauge and run length: Compare installed wire size to Pentair Sta‑Rite installation manual. Long runs with undersized wire cause voltage drop. If wire is undersized, have an electrician pull the correct gauge conductors.
• Isolate the circuit: Ensure the pump is on a dedicated breaker. Large loads (heat pump, air conditioner, electric range) on the same circuit can cause dips. Move the pump to its own breaker if needed.
• Reset the pump: After corrections, restore power, wait 30 seconds, then press Start. If E01 persists with correct voltage, the drive electronics may be damaged and require replacement.