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Error code reference

Amana Dryer Error Code F:24

Inlet thermistor is open (appears ONLY in Diagnostic Test Mode).

Amana codesAmana dryer codes

Inlet thermistor is open (appears ONLY in Diagnostic Test Mode).

First step from the service manual

See TEST #4a.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F:24 means on a Amana dryer

The F:24 error code on an Amana dryer indicates that the inlet thermistor circuit is open. A thermistor is a temperature-sensing resistor whose resistance changes predictably with temperature. An open circuit in this component means the electrical path through the thermistor has been completely broken, so the control board receives no usable signal from that sensor. This fault is only detectable and displayed during Diagnostic Test Mode, meaning the dryer's self-test routine actively checks the thermistor circuit and flags the failure rather than displaying it during normal operation.

The inlet thermistor monitors the temperature of air entering the dryer drum. This data feeds directly into the control board's ability to regulate the heating element and prevent overheating. When this sensor goes open, the control board loses its ability to accurately monitor inlet air conditions, which can affect drying performance and thermal protection logic.

Common root causes include a failed thermistor with an internal break in its resistive element, damaged wiring in the harness connecting the thermistor to the control board, or a corroded or loose connector at either the thermistor or the board. Physical damage from heat exposure near the inlet area can degrade both the component and the surrounding wiring over time. Diagnostic Test #4a is the designated starting point for isolating whether the fault lies in the thermistor itself or in the wiring and connectors leading to it.

Source: manufacturer service documentation.

Common causes of F:24

  1. 01

    Failed inlet thermistor

    Part replacement

    The thermistor's internal resistive element has broken, creating an open circuit. This is the most common cause and the thermistor will need to be tested with a multimeter and replaced if it shows infinite resistance.

  2. 02

    Damaged wiring harness

    Wiring / connection

    The wires connecting the inlet thermistor to the control board may be broken, frayed, or pinched, interrupting the circuit. A visual inspection and continuity test of the harness will identify any breaks.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The connector at the thermistor or at the control board may have worked loose or developed corrosion, breaking the electrical path. Disconnecting and reseating the connectors while inspecting the terminals for corrosion can resolve this.

  4. 04

    Heat damage to thermistor or wiring

    Part replacement

    Prolonged exposure to high temperatures near the inlet can degrade the thermistor body or melt insulation on nearby wiring. Look for discoloration, melted plastic, or brittle wire insulation in the area.

See the test procedure for each cause

Frequently asked questions about F:24

What does F:24 mean on a Amana dryer?
F:24 means the control board detected an open circuit in the inlet thermistor during Diagnostic Test Mode. The inlet thermistor is a temperature sensor that monitors incoming air temperature. Because the circuit is open, no signal is reaching the control board from that sensor. The fault points to either the thermistor itself, its wiring, or the connectors in that circuit.
Will resetting the dryer clear the F:24 error code?
A simple power reset is unlikely to permanently clear F:24 because the fault reflects an actual open circuit in the thermistor or its wiring, not a temporary control glitch. The code will return when Diagnostic Test Mode is run again if the underlying hardware problem is not corrected. The root cause must be diagnosed and repaired to resolve the code.
How do I fix the F:24 error on my Amana dryer?
Start by running Diagnostic Test #4a as directed, which is the designated test for isolating this fault. Use a multimeter to check the inlet thermistor for continuity, and inspect the wiring harness and connectors for damage or looseness. If the thermistor reads infinite resistance, it has failed and needs replacement. If the thermistor tests good, trace the wiring back to the control board to find any breaks or corrosion.
Is it safe to use my Amana dryer when the F:24 code is present?
F:24 only appears during Diagnostic Test Mode, so the dryer may still run normal cycles. However, with a non-functional inlet thermistor, the control board cannot accurately monitor incoming air temperatures, which can affect heating regulation and thermal safety logic. It is best to address the fault before continued heavy use to avoid potential overheating issues.
How much does it cost to repair an F:24 error on an Amana dryer?
If the fix is a loose connector or minor wiring repair, costs may be limited to diagnostic labor, typically in the range of $50 to $100 for a service call. If the inlet thermistor needs replacement, the part itself is generally inexpensive, with total repair costs including labor often ranging from $100 to $200 depending on your location and service provider. Control board replacement, if ultimately required, would push costs higher.

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