F18
Whirlpool
Powered Anode / Corrosion Protection Fault
F18 error, hybrid water heater indicates anode or corrosion protection system fault (on powered anode models)
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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
Failed powered anode rod, open anode wiring, control board anode driver failure, excessive water conductivity
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker.
Inspection:
- Locate the powered anode connection on top of the tank (often a small module with wires entering the tank).
- Inspect wiring for damage or loose connectors.
- Check for corrosion around the anode port.
Corrective actions:
- Replace the powered anode assembly if Whirlpool diagnostics indicate an open or shorted anode.
- Ensure proper grounding of the water heater and plumbing system.
- If the control board's anode driver circuit is faulty, replace the main control board.
Note: Operating long-term without proper anode protection can shorten tank life due to corrosion.
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Repair Difficulty
Hard
4/5
Required Part
Powered Anode Rod Assembly
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