Control panel shows E15 sensor fault, generator refuses to start

Safety first: Turn OFF the generator and disconnect battery negative before probing wiring.

• Identify faulty sensor: The Scheppach controller menu or manual usually indicates which sensor (oil temp, coolant temp, etc.) is in fault. Note the specific channel.
• Inspect wiring harness: Trace the harness from the controller to the suspect sensor. Look for chafed insulation, rodent damage, or loose connectors. Repair or replace damaged sections.
• Sensor resistance check: Disconnect the sensor and measure its resistance with a multimeter at ambient temperature. Compare to the Scheppach specification chart. An open circuit or zero ohms indicates a bad sensor.
• Substitute sensor: Temporarily install a known‑good Scheppach sensor of the same type. If E15 clears, replace the original sensor.
• Control board test: If wiring and sensor are good but E15 remains, the controller's input circuit may be defective and the control board will need replacement.