Generator starts then shuts down within a few seconds; controller displays E03.

Safety first: Turn the generator OFF, disconnect the battery negative cable, and wait for all moving parts to stop. Do not work near the flywheel or belts with the engine running unless you are trained and using proper precautions.

• Inspect throttle and governor linkage: Remove the side panel to access the carburetor and governor arm. Manually move the throttle plate and governor linkage; it should move smoothly and return by spring tension. Clean any dirt or corrosion and lubricate pivot points lightly with a dry lubricant.
• Check for binding: Ensure no wiring harness, cable, or debris is interfering with the governor arm or throttle lever. Re‑route or secure any loose wiring.
• Verify governor spring: Inspect the governor spring between the governor arm and throttle lever. If stretched, broken, or missing, replace the governor spring with a WEN‑compatible part.
• Inspect RPM sensor: Many WEN standby units use a magnetic pickup or ignition coil signal for RPM feedback. Locate the RPM sensor near the flywheel or crankshaft. Check the air gap (refer to your WEN manual, typically 0.3–0.5 mm) and clean any metal shavings from the sensor tip. Replace the engine speed sensor if its wiring is damaged or if it fails continuity tests.
• Controller reset: Reconnect the battery, clear the E03 code, and attempt a manual start while observing engine speed. If the engine still surges or immediately shuts down with E03, the control board's RPM sensing circuit may be faulty and should be tested or replaced by a technician.