Controller shows F20 Exhaust Temperature High; generator shuts down under load.

Safety first: Exhaust components are extremely hot. Allow sufficient cooling time before touching any exhaust piping or sensors.

• Check load level: Review the total connected load during operation. If the generator is consistently loaded above its rated kW, reduce load by shedding non-essential circuits.
• Inspect exhaust piping: Look for crushed, kinked, or blocked exhaust sections. Ensure that rain caps and spark arrestors are not clogged with soot.
• Verify fuel quality and mixture: For gas units, confirm correct gas pressure and that no air is entering the fuel line. For diesel units, ensure fuel is clean and not contaminated with water.
• Inspect exhaust temperature sensor: Locate the sensor on the exhaust manifold or pipe. Check wiring and connector. Replace the sensor if it shows unrealistic readings compared to engine load and coolant temperature.
• Professional evaluation: Persistent high exhaust temperature under normal load may indicate injector or combustion issues and should be evaluated by a technician.