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Error code reference

Amana Washer Error Code oF

Thermistor temperature out of range low

Amana codesAmana washer codes

Thermistor temperature out of range low - control goes into this condition if the temperature near the thermistor falls below 30°F.

First step from the service manual

Disconnect electric power, remove front panel, and check for broken, loose or incorrect wiring between thermistor and control.

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

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What oF means on a Amana washer

The oF error code on an Amana washer indicates the control board has detected an open circuit from the thermistor, or a temperature reading at or below 30°F near the thermistor. An open circuit means the control is receiving no signal from the thermistor at all, which it interprets as an out-of-range low temperature condition. The thermistor is a temperature-sensing resistor that feeds real-time water or ambient temperature data to the control board to manage wash and rinse cycles accurately. When that signal is absent or falls outside acceptable parameters, the control faults out and displays oF.

For homeowners, the thermistor is a small sensor inside the washer that tells the machine how cold or warm the water is. If the washer cannot read a valid temperature, it stops the cycle and displays this code rather than risk operating incorrectly. The most common reasons this happens are a wiring problem between the thermistor and the control board, or a failed thermistor itself.

Before assuming the thermistor has failed, always inspect the wiring harness first. A loose connector, broken wire, or pin that has backed out of a connector can cause an open circuit that mimics a failed sensor. The first diagnostic step is disconnecting power, removing the front panel, and carefully inspecting all wiring between the thermistor and the control board.

Source: manufacturer service documentation.

Common causes of oF

  1. 01

    Loose or disconnected wiring between thermistor and control board

    Wiring / connection

    A connector that has vibrated loose or a wire that has pulled free from a terminal breaks the circuit between the thermistor and the control board, producing an open circuit condition that triggers the oF code. This is the first thing to inspect because it requires no parts and is a common result of normal machine vibration over time.

  2. 02

    Broken or damaged thermistor wiring harness

    Part replacement

    A wire in the harness running from the thermistor to the control board can develop a break internally or at a stress point, interrupting the signal entirely. The break may not be visible without flexing the harness along its length while checking for continuity with a multimeter.

  3. 03

    Failed thermistor

    Part replacement

    The thermistor itself can fail open, meaning it no longer passes any signal to the control board. A multimeter resistance check across the thermistor terminals will show an open reading (OL or infinite resistance) rather than the expected resistance value for the ambient temperature, confirming the sensor needs replacement.

  4. 04

    Ambient temperature below 30°F near the washer

    Wiring / connection

    If the washer is installed in an unheated garage, utility room, or other space where temperatures drop to or below 30°F, the thermistor will report a reading the control board considers out of range and display oF even though no component has failed. Moving the washer to a warmer location or warming the space resolves the code without any parts.

See the test procedure for each cause

Frequently asked questions about oF

What does the oF error code mean on an Amana washer?
The oF code means the control board detected either an open circuit from the thermistor or a temperature reading at or below 30°F near the thermistor. The thermistor is a small temperature sensor inside the washer. When the control cannot get a valid temperature signal, it stops the cycle and displays oF. Start by checking whether the washer is in a space that gets extremely cold, then inspect the wiring between the thermistor and the control board before replacing any parts.
How do I fix the oF code on my Amana washer?
Disconnect power to the washer, then remove the front panel to access the thermistor and its wiring. Check every connector and wire between the thermistor and the control board for loose connections, backed-out pins, or visible breaks. Reconnect or repair any wiring issues found. If the wiring is intact, test the thermistor with a multimeter set to resistance mode. An open reading (OL) confirms the thermistor has failed and needs to be replaced. If both the wiring and thermistor test good, the control board itself may be at fault.
Can I still use my Amana washer when it shows the oF error code?
The washer will not complete a cycle while the oF code is active because the control board has halted operation due to the invalid temperature reading. Running a wash cycle without a functioning thermistor could result in incorrect water temperature being used without the machine detecting it, which may damage fabrics or produce poor wash results. Do not bypass the code; address the root cause before resuming normal use.
How much does it cost to repair the oF error code on an Amana washer?
If the fix is a loose connector or a wiring repair, the cost is minimal and typically a DIY job with no parts required. A replacement thermistor generally costs between $15 and $40 for the part, and replacing it is a moderate DIY repair after removing the front panel. If a technician is needed, expect a service call fee of $75 to $150 plus parts and labor, making the total repair cost anywhere from $100 to $250 depending on your area and whether the control board is also involved.
Could extremely cold weather cause the oF code on my Amana washer?
Yes. The oF code is triggered when the thermistor reports a temperature at or below 30°F, which can happen if the washer is located in an unheated garage or basement during winter. In this case, no component has failed. Bring the ambient temperature in the installation space above 30°F, then clear the code by unplugging the washer for one minute and restoring power. If the code does not return in a warmer environment, the installation location was the cause.

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