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Error code reference

A.O. Smith Water Heater Error Code 17

Power Anode circuit failure.

A.O. Smith codesA.O. Smith water heater codes

Power Anode circuit failure.

First step from the service manual

Turn power off for 10 to 20 seconds then on again to clear the error code.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 17 means on a A.O. Smith water heater

Error code 17 on an A.O. Smith water heater indicates a Power Anode circuit failure. The powered anode rod is an active corrosion protection system that uses a small impressed electrical current to protect the tank lining from electrochemical corrosion. Unlike a traditional sacrificial magnesium or aluminum anode rod that physically depletes over time, the powered anode system relies on a control circuit to deliver that protective current continuously. When the water heater's control board detects an interruption or fault in this circuit, it triggers error code 17.

The failure can originate at several points in the circuit: the anode rod itself, the wiring harness connecting the rod to the control board, or the control board's anode driver circuitry. A broken or corroded connection anywhere along this path will cause the circuit check to fail. In some cases, the anode rod element may have degraded or shorted internally, producing an out-of-range signal that the board interprets as a circuit fault.

The first diagnostic step is a power cycle, turning the unit off for 10 to 20 seconds and then back on, to determine whether the fault was a transient signal anomaly or a persistent hardware failure. If the error returns immediately after the reset, a physical inspection of the anode rod, its connections, and the wiring harness is warranted. Persistent code 17 faults that survive a power cycle almost always require component-level attention.

Source: manufacturer service documentation.

Common causes of 17

  1. 01

    Loose or corroded anode rod connection

    Wiring / connection

    The wiring connector at the powered anode rod can loosen or corrode over time, breaking the circuit. Inspect the connector at the rod head for oxidation, moisture intrusion, or a loose fit.

  2. 02

    Failed powered anode rod

    Part replacement

    The anode rod element itself can degrade or fail internally, producing a shorted or open circuit that triggers code 17. Replacing the powered anode rod is the most common repair when the wiring checks out normal.

  3. 03

    Damaged wiring harness

    Part replacement

    The harness running from the control board to the anode rod can sustain damage from heat, pinching, or rodents. Visually trace the harness and check for any breaks, melted insulation, or severed wires.

  4. 04

    Transient electrical disturbance

    Wiring / connection

    A brief power surge or voltage fluctuation can cause a one-time false circuit fault. If the code clears after a 10 to 20 second power cycle and does not return, no further action is needed.

  5. 05

    Control board anode driver circuit failure

    Part replacement

    If the wiring and anode rod both test normal, the fault may lie in the portion of the main control board that drives the anode circuit. A failed board will produce a persistent code 17 that survives all resets.

See the test procedure for each cause

Frequently asked questions about 17

What does 17 mean on a A.O. Smith water_heater?
Error code 17 indicates a Power Anode circuit failure. The water heater has detected a fault in the electrical circuit that drives the powered anode rod, which is the component responsible for protecting the tank from internal corrosion. The fault can be caused by a loose connection, a failed anode rod, damaged wiring, or in some cases a faulty control board. The first step is to power cycle the unit for 10 to 20 seconds to see if the fault clears.
Will resetting the water heater clear error code 17?
A power cycle of 10 to 20 seconds will clear code 17 if the fault was caused by a transient electrical disturbance. If the underlying cause is a physical component failure such as a bad anode rod or damaged wiring, the code will return shortly after the reset. A reset that holds with no returning fault is a good sign that no hardware repair is needed.
Is it safe to use my water heater when error code 17 is displayed?
The water heater will generally continue to heat water with code 17 active, so there is typically no immediate safety hazard for the household. However, the powered anode corrosion protection system may not be functioning, which means the tank lining could be exposed to accelerated corrosion over time. It is advisable to diagnose and resolve the fault promptly to avoid long-term tank damage.
How do I fix error code 17 on an A.O. Smith water heater?
Start by turning the unit off for 10 to 20 seconds and then back on. If the code returns, inspect the wiring connector at the powered anode rod for looseness or corrosion and reseat it firmly. If the connection is secure, the anode rod itself is the most likely failed component and should be replaced. If a new anode rod and intact wiring do not resolve the fault, the control board may need evaluation.
How much does it cost to repair error code 17 on an A.O. Smith water heater?
If the fix is simply reseating a connector, there is no parts cost involved. A replacement powered anode rod typically runs in the range of $30 to $80 depending on the model. If the control board requires replacement, parts and labor costs combined can range from $200 to $500 or more. Having a technician diagnose the specific failed component before ordering parts is recommended to avoid unnecessary expense.

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