Amana Dryer Error Code F:28

The F:28 error code on an Amana dryer indicates that the moisture sensor strip circuit is open. This code appears exclusively during Diagnostic Test Mode, meaning it will not surface during a normal drying cycle. The moisture sensor system consists of two metallic sensor bars located inside the dryer drum. As wet clothes tumble and contact these bars, the conductivity between them allows the control board to measure remaining moisture levels. When the circuit reads as open, the control board detects no electrical continuity through the sensor strip assembly, signaling a break somewhere in that circuit.

An open circuit in the moisture sensor system typically points to a physical break in the sensor bars themselves, corroded or disconnected wiring, or a failed connection at the control board harness. Residue buildup from dryer sheets and fabric softener can coat the sensor bars heavily enough to interfere with conductivity, though this more commonly causes erratic readings rather than a fully open circuit. A complete open reading usually suggests a wiring fault, a broken sensor bar, or a disconnected connector in the sensor circuit path.

Diagnosis should begin with TEST #5 as directed by the Amana diagnostic procedure. This test is designed to isolate whether the fault lies in the sensor bars themselves, the wiring harness connecting them to the control board, or the control board input circuitry. Technicians should inspect the sensor bars for physical damage or heavy coating, check all connectors in the circuit for corrosion or looseness, and use a multimeter to verify continuity through the sensor strip wiring before condemning any individual component.