E16
Rheem
Abnormal Combustion / Flame Signal Error
Rheem tankless water heater displays E16 and shuts down intermittently
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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
Dirty burner, Incorrect gas pressure, Blocked vent or intake, Faulty flame sensor or control board
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas. Combustion issues can be hazardous.
- Inspect vent and intake: Remove obstructions and verify proper vent configuration.
- Clean burner and flame rod: Access the burner assembly. Blow out dust with compressed air and clean the flame rod with fine abrasive pad.
- Check gas pressure (technician): Have a licensed technician verify inlet and manifold gas pressures and adjust regulator if needed.
- Check condensate drain (condensing models): Ensure the condensate trap and line are clear to prevent combustion disturbance.
- If E16 persists: The control board or gas valve modulation may be faulty; professional service is recommended.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Burner Assembly
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