Maytag Dishwasher Error Code SF4

SF4 indicates a cold water problem, meaning the temperature sensor at the inlet is detecting water below 80°F entering the dishwasher. The control board triggers this fault because water that is too cold can prevent proper cleaning and detergent performance. The issue is most often related to cold water sitting in the supply lines rather than a failed component. Checking the water supply and inlet valve are the recommended first steps.

The SF4 code itself does not indicate a dangerous condition, but running a cycle with water that is too cold will result in poor cleaning performance and inadequate sanitization. It is best to resolve the water temperature issue before running full cycles. The dishwasher may not complete cycles normally while the fault is active.

If the fix involves only adjusting the water heater temperature or flushing the supply lines, there may be no parts cost at all. Replacing a faulty inlet valve typically costs between $20 and $80 for the part, with additional labor charges if a technician is hired. A temperature sensor replacement is generally in a similar price range for the part. Total repair costs including labor can range from around $80 to $200 or more depending on the specific component and your location.

Start by running the hot water tap at your kitchen sink for about a minute before starting the dishwasher to flush cold water from the supply lines. Also confirm that the water heater is set to an appropriate temperature and that the supply line shut-off valve is fully open. If the error persists after improving the hot water supply, inspect the inlet valve for restrictions and consider testing the temperature sensor for accuracy.

A reset may temporarily clear the SF4 code, but the fault will return if the underlying cause has not been addressed. If the incoming water is still below 80°F when the next cycle begins, the sensor will detect the cold water again and re-trigger the error. Resolve the water supply or component issue first for a lasting fix.