Light Fault – LED Module Failure

What Does the JennAir Light Fault Error Code Mean?

One or more LED light modules in the ventilation hood are not functioning. On JennAir hoods with integrated LED lighting, the LED modules are not standard bulbs — they are solid-state components wired to a driver board. If replacing the LED module does not resolve the issue, the LED driver board may need replacement.

When your JennAir Ventilation displays the Light Fault code, it means the appliance's self-diagnostic system has detected a fault that requires attention. A single power cycle that clears the code is not a reliable fix if the underlying cause has not been addressed.

Common Causes of the Light Fault Error

Based on our technicians' experience servicing JennAir Ventilations, the Light Fault code is most frequently triggered by:

• Component failure: A worn or failed internal part — motor, pump, sensor, or control board — is the most common root cause when this code appears repeatedly.
• Blockage or restriction: Debris, lint, or mineral buildup in filters, hoses, or drain paths can trigger this error without any component failure.
• Wiring or connector issue: Vibration over time can loosen harness connectors, causing intermittent faults.
• Control board fault: Less commonly, the main control board may misread sensor signals and generate a false error.
• Installation issue: Improper leveling, restricted ventilation, or incorrect water supply pressure can cause error codes under normal operation.

Step-by-Step Troubleshooting

Before scheduling a service call, work through these steps in order:

1. Power cycle the appliance. Unplug from the wall outlet and leave unplugged for 60 seconds. Plug back in and run a short test cycle.
2. Inspect and clean filters. Locate the filter or trap for your specific model. Remove, rinse, and reinstall.
3. Check hoses and connections. Inspect drain hose, water inlet hose, and any visible connections for kinks, blockages, or loose fittings.
4. Verify installation conditions. Confirm the appliance is level, has adequate ventilation clearance, and water supply pressure is within spec.
5. Run a diagnostic cycle. Many JennAir models support a built-in diagnostic mode. Consult your owner's manual for the key sequence.

When to Call a Professional

If the Light Fault code returns after completing the steps above, a component has likely failed. Continuing to run the appliance with an active fault may cause secondary damage.

JennAir Support Center technicians carry the most common replacement parts on every service vehicle. In most cases, we diagnose and complete the repair in a single visit.

Repair Cost Estimate

Typical ranges based on our service history:

• Blockage removal / filter cleaning: Covered under the diagnostic fee if no part is needed
• Pump or motor replacement: $150-$350 including parts and labor
• Sensor or harness repair: $100-$220 including parts and labor
• Control board replacement: $200-$450 including parts and labor

All repairs include a 30 day parts and labor warranty. A written estimate is provided before any work begins.