E20
Westinghouse Rich Fuel Mixture / Exhaust Overfuel Fault

Generator shuts down and displays E20, often with a strong fuel smell at the exhaust

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Stuck-open fuel solenoid, misadjusted carburetor (gaseous models), clogged air filter, failed oxygen sensor (if equipped)

How to Fix / Troubleshooting

Safety first: Excess fuel in the exhaust can be a fire hazard. Turn the controller to OFF, open the main AC breaker, disconnect the negative battery cable, and ventilate the area.

  • Inspect air filter: Remove and inspect the air filter. Replace if dirty or oil-soaked to restore proper air flow.
  • Check fuel solenoid: Locate the fuel shutoff solenoid on the gas train or carburetor. Ensure it closes when the generator is off. If it remains open or leaks, replace the solenoid.
  • Verify regulator settings: Have a qualified gas technician confirm that the gas regulator outlet pressure matches Westinghouse specifications. Overpressure can cause rich running.
  • Exhaust inspection: Check that the exhaust is not restricted by nests or debris, which can affect mixture control.

Persistent E20 faults require professional adjustment of the carburetor or fuel mapping.

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Repair Difficulty

Hard 4/5

Required Part

Fuel Shutoff Solenoid
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