E02
Rheem
Flame Sense Failure / Flame Loss
Heater attempts to start but shuts down with E02 on the display
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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
Contaminated flame sensor, Poor burner ground, Unstable gas pressure, Faulty ignition control board
How to Fix / Troubleshooting
Safety First: Disconnect electrical power and shut off gas before servicing.
- Clean the flame sensor: Remove the flame sensor from the burner assembly. Lightly polish the sensing rod with fine steel wool to remove oxidation and soot. Reinstall and ensure it is properly positioned in the burner flame path.
- Check ground connections: Verify that the burner tray and ignition control board have solid ground connections to the chassis. Tighten any loose screws and clean rusted contact points.
- Inspect burners: Remove and visually inspect burners for rust flakes, spider webs, or debris that could cause unstable flame. Clean with a soft brush and compressed air.
- Monitor gas pressure (pro only): If flame appears to light but then drops out, a licensed technician should check inlet and manifold gas pressure against Rheem specifications.
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Repair Difficulty
Hard
4/5
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