Rheem
Short Cycling / Flame Dropout
Heater lights but shuts off after a few seconds or minutes without showing an error
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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
Marginal flame sensor signal, Unstable gas pressure, Blocked burners, Over-sensitive high limit
How to Fix / Troubleshooting
Safety First: Turn off power and gas before servicing.
- Clean flame sensor: Remove and gently clean the flame sensor rod with fine steel wool. Reinstall ensuring it is fully in the flame.
- Inspect burners: Remove burner tray and clean out rust flakes, spider webs, and debris. Ensure burner ports are clear.
- Check filter and flow: Low flow can cause rapid temperature rise and high limit trips. Clean the filter and verify valves are open.
- Have gas pressure checked: A technician should verify inlet and manifold pressure to ensure stable combustion.
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Repair Difficulty
Hard
4/5
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