Frigidaire Dishwasher Error Code i59

The i59 code means the main control board has detected a fault in the circuit that reads the wash pump motor's current, including a failure in the analog-to-digital conversion process. The board cannot obtain a valid current measurement, so it stops the cycle to prevent potential damage. This fault is rooted in the signal path between the wash motor and the control board, or within the board's own sensing circuitry.

A power reset may temporarily clear the code, but if the underlying fault in the current-sensing circuit or harness is still present, the i59 error will return once the dishwasher attempts to run the wash cycle. A reset is useful as a first step to confirm whether the fault is intermittent, but it does not repair the root cause.

If the fix is simply reseating or replacing a damaged wire harness, costs are generally low, typically in the range of $20 to $80 for parts. Replacing the wash motor can cost between $100 and $250 in parts alone, while a new main control board typically ranges from $100 to $300 or more depending on the model. Labor charges from a technician will add to these estimates.

Start by inspecting the wash motor wire harness and all connectors leading to the main control board, looking for loose terminals, corrosion, or damaged wires. Reseat every connector firmly and clear any corrosion with electrical contact cleaner. If the harness is in good condition, the wash motor or the main control board may need to be replaced.

It is not advisable to continue running the dishwasher while this code is active. The i59 fault means the control board cannot monitor the wash motor's current draw, which removes an important safeguard against motor overloads or overheating. The dishwasher should be diagnosed and repaired before returning to regular use.