Generator will not start in AUTO or MANUAL mode; control panel shows E01 immediately after a start attempt.

Safety first: Place the Genergy standby generator in OFF mode, disconnect the battery negative cable, and ensure the automatic transfer switch (ATS) is isolated from utility and generator power before working on the unit.

• Check oil level: Remove the engine dipstick and verify oil level is between MIN and MAX. Top up with the oil grade specified in the Genergy manual (typically 10W‑30 or as labeled on the engine shroud). Do not overfill.
• Inspect for oil leaks: Look around the oil filter, drain plug, crankcase gasket, and oil cooler lines for fresh oil. Tighten loose fittings and replace damaged gaskets or hoses.
• Test oil pressure switch: Locate the oil pressure switch on the engine block (usually near the oil filter). Disconnect the connector and check continuity with a multimeter according to the Genergy service manual. A switch stuck open or shorted should be replaced.
• Check wiring harness: Trace the oil pressure switch wiring back to the Genergy control module. Look for chafed insulation, loose connectors, or corrosion. Clean and reseat connectors.
• Clear code and retest: Reconnect the battery, set the controller to MANUAL, and attempt a start. If E01 clears and the unit runs with normal oil pressure, return the unit to AUTO.

If the code persists with correct oil level, do not continue to crank the engine; internal lubrication failure can cause severe damage. Contact a qualified Genergy service technician for oil pump and internal engine pressure testing.