Whirlpool Dryer Error Code F:28

F:28 indicates that the moisture sensor strip circuit is open, meaning the control board is detecting no electrical signal from the sensor. This points to a break somewhere in the sensor circuit, whether in the sensor bars themselves, the wiring harness, or the terminal connections. This code only appears during the dryer's built-in diagnostic test mode and will not display during a normal drying cycle.

The dryer may continue to operate in timed dry mode even with a faulty moisture sensor, since F:28 only surfaces in diagnostic mode. However, without a functioning moisture sensor, the dryer cannot accurately detect when clothes are dry, which may result in under-dried loads or unnecessarily long cycles. It is best to diagnose and repair the sensor circuit before continued regular use.

If only cleaning the sensor bars or reseating a connector resolves the issue, the repair may cost very little beyond your time. If the moisture sensor strip itself needs replacement, parts typically range from $15 to $50 depending on the specific model. Adding professional labor, a complete repair can range from $75 to $200 or more depending on your location and the complexity of access to the sensor.

Resetting the dryer will not permanently clear F:28 because the code only appears during diagnostic test mode rather than during standard operation. The underlying open circuit in the moisture sensor will still be present after a reset. The fault will reappear the next time a technician runs the diagnostic sequence unless the root cause is repaired.

A failed moisture sensor is generally not a direct safety hazard, as it does not affect the heating or venting systems. However, running the dryer without accurate moisture sensing can lead to over-drying, which puts unnecessary wear on fabrics and the machine itself. Repair is recommended to restore proper cycle control and prevent inefficient operation.