A.O. Smith Water Heater Error Code 17

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.

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.

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.

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.

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.