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Error code reference

Maytag Washer Error Code 29

Sump thermistor failure

Maytag codesMaytag washer codes

Sump thermistor failure - high/low temperature or abnormal resistance at sump thermistor.

First step from the service manual

Check harness connections and sump thermistor continuity.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 29 means on a Maytag washer

Error code 29 on a Maytag washer indicates a sump thermistor failure. The sump thermistor is a temperature-sensing component located at the sump area of the washer, responsible for monitoring water temperature during the wash cycle. The control board reads the thermistor's resistance value to determine water temperature, and when that resistance falls outside the expected range, or when the reported temperature is abnormally high or low, the board triggers error code 29 and halts operation to prevent damage.

The most common triggers for this code involve either a wiring issue or a failed thermistor component. A loose, corroded, or broken connector in the harness between the sump thermistor and the control board can cause resistance readings that appear abnormal to the board. Similarly, a thermistor that has drifted out of its normal resistance specification due to age, heat exposure, or physical damage will produce inaccurate temperature signals. In some cases, water intrusion into the connector can cause intermittent or erratic readings.

Diagnostic procedure begins with a visual and physical inspection of the harness connections at the sump thermistor and at the control board. If connectors are secure and undamaged, the next step is to check continuity and resistance across the thermistor itself. A thermistor reading an open circuit, a short, or a resistance value significantly outside the normal range for the current water temperature confirms component failure and indicates the thermistor needs replacement.

Source: manufacturer service documentation.

Common causes of 29

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    A connector that has vibrated loose or was not fully seated at the sump thermistor or control board can interrupt the signal and trigger this code. Inspect both ends of the harness for secure connections and signs of backing out.

  2. 02

    Failed sump thermistor

    Part replacement

    The thermistor itself may have failed, producing resistance values that are out of range for the actual water temperature. Testing continuity and resistance across the thermistor terminals will confirm if the component has failed and needs replacement.

  3. 03

    Corroded or damaged connector terminals

    Wiring / connection

    Water exposure or prolonged humidity can cause corrosion on the thermistor connector pins, increasing resistance at the connection point and producing false readings. Look for green or white oxidation on the terminals and clean or replace the connector as needed.

  4. 04

    Broken or chafed wiring in the harness

    Part replacement

    A wire in the thermistor harness that has been pinched, chafed against a cabinet edge, or broken internally can cause an open or intermittent circuit. Flex the harness along its routing path while monitoring for resistance changes to locate a break.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and wiring harness both test within normal specifications, the control board may be misreading the thermistor signal due to an internal fault. This is the least common cause and should only be considered after ruling out the sensor and wiring.

See the test procedure for each cause

Frequently asked questions about 29

What does 29 mean on a Maytag washer?
Error code 29 on a Maytag washer indicates a sump thermistor failure. The sump thermistor monitors water temperature at the bottom of the machine, and this code is triggered when the control board detects a temperature reading that is abnormally high, abnormally low, or a resistance value that falls outside the expected range. The washer stops operation until the fault is addressed.
Can I fix error code 29 myself on a Maytag washer?
In many cases, yes. Start by unplugging the washer and inspecting the wiring harness and connectors at the sump thermistor for loose, corroded, or damaged connections. If the connectors are secure and undamaged, use a multimeter to test resistance across the thermistor terminals. A thermistor that reads open circuit or shows clearly abnormal resistance should be replaced, which is a straightforward repair for someone comfortable working with appliance components.
Is it safe to keep using my Maytag washer when error code 29 appears?
It is not recommended to continue running the washer while this code is active. The sump thermistor helps the control board regulate wash temperature, and operating without an accurate temperature signal could result in improper wash conditions. The washer will typically halt the cycle on its own when this code is triggered, which is a protective behavior you should not attempt to bypass.
How much does it cost to repair error code 29 on a Maytag washer?
If the issue is a failed sump thermistor, the part itself typically costs in the range of $15 to $50 depending on the specific model. If you hire a technician, total repair costs including labor generally fall in the range of $100 to $200. If the control board is the root cause, costs will be higher, often ranging from $200 to $400 or more for parts and labor.
Will resetting my Maytag washer clear error code 29?
A reset may temporarily clear the code, but if the underlying problem with the sump thermistor or its wiring has not been corrected, the code will return as soon as the washer attempts to read temperature during the next cycle. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. The thermistor, wiring harness, and connectors should be inspected and tested to resolve the issue permanently.

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