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Error code reference

Amana Dryer Error Code F:25

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

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Inlet thermistor is shorted (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:25 means on a Amana dryer

The F:25 error code on an Amana dryer indicates that the inlet thermistor circuit has shorted. The inlet thermistor is a temperature-sensing component that monitors the air temperature entering the dryer drum. When a short circuit condition is detected in this sensor's circuit, the control board registers F:25. Importantly, this code only appears during Diagnostic Test Mode, meaning it will not display during normal drying operation. This is relevant for technicians running the built-in diagnostic routine to evaluate sensor health before or after a complaint.

A shorted thermistor typically means the resistance across the sensor has dropped abnormally low, often approaching zero ohms. Under normal operating conditions, a thermistor's resistance varies predictably with temperature, but a short bypasses this relationship entirely, sending the control board an inaccurate signal. This can occur due to internal component failure within the thermistor itself, damaged wiring that allows conductors to contact each other, or moisture intrusion into the connector or sensor housing.

The first recommended diagnostic step is TEST #4a, which addresses thermistor circuit evaluation. This test involves checking resistance values at the thermistor and tracing the wiring harness back to the control board to isolate whether the fault is in the sensor itself or in the associated wiring. Technicians should disconnect power before probing components and verify that connector pins are not corroded, bent, or bridged. Replacing a confirmed shorted thermistor is typically the resolution once wiring integrity has been confirmed.

Source: manufacturer service documentation.

Common causes of F:25

  1. 01

    Failed inlet thermistor

    Part replacement

    The thermistor itself has internally shorted, causing resistance to drop to near zero. This is the most common cause and can be confirmed by measuring resistance across the thermistor terminals and comparing to the expected range.

  2. 02

    Damaged wiring harness

    Part replacement

    Insulation on the thermistor wiring can wear, melt, or chafe against the dryer cabinet, causing two conductors to contact each other and create a short. Inspect the full length of the wire harness from the thermistor to the control board.

  3. 03

    Corroded or bridged connector pins

    Wiring / connection

    Moisture or debris in the thermistor connector can bridge adjacent pins, simulating a short circuit. Inspect the connector carefully and clean or replace as needed.

  4. 04

    Moisture intrusion at the sensor

    Part replacement

    Water or condensation entering the thermistor housing can create a low-resistance path across the sensor terminals. Check for signs of moisture or corrosion at the sensor mounting location.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the control board's thermistor input circuit can malfunction and incorrectly report a short condition even when the sensor and wiring are intact. This should only be considered after the thermistor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about F:25

What does F:25 mean on a Amana dryer?
F:25 on an Amana dryer means the inlet thermistor has been detected as shorted during Diagnostic Test Mode. The inlet thermistor is a sensor that monitors incoming air temperature, and a short means its resistance has dropped to an abnormal level. This code only appears during the dryer's built-in diagnostic routine, not during regular operation. It signals that the thermistor or its associated wiring circuit needs inspection.
Can I fix the F:25 error code myself?
A knowledgeable DIYer can tackle this repair by following TEST #4a in the diagnostic procedure. The process involves checking the resistance of the inlet thermistor and inspecting the wiring harness for damage or pinched conductors. If the thermistor measures a near-zero resistance when disconnected from the control board, it has shorted and needs replacement. Always disconnect the dryer from power before inspecting or replacing any components.
Is it safe to use my Amana dryer when F:25 is showing?
The F:25 code only appears in Diagnostic Test Mode and will not interrupt a normal drying cycle on its own. However, a shorted inlet thermistor means the dryer cannot accurately monitor incoming air temperature, which could affect drying performance or thermal safety controls over time. It is advisable to diagnose and resolve the fault before continued heavy use.
How much does it cost to repair the F:25 error on an Amana dryer?
If the inlet thermistor is the faulty part, replacement thermistors typically cost anywhere from $15 to $50 depending on the specific part. If a technician is hired for the diagnosis and repair, total labor and parts costs generally fall in the range of $100 to $250. Control board replacement, if required after ruling out the thermistor and wiring, would push costs considerably higher.
Will resetting my Amana dryer clear the F:25 code?
Because F:25 only appears during Diagnostic Test Mode, exiting the diagnostic routine will cause the code to stop displaying. However, resetting or power cycling the dryer does not repair the underlying shorted thermistor circuit. The next time a diagnostic test is run, the code will return until the faulty component or wiring is actually repaired or replaced.

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