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Error code reference

Amana Oven Error Code 20

RTD (temperature sensor) open circuit detected.

Amana codesAmana oven codes

RTD (temperature sensor) open circuit detected.

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What 20 means on a Amana oven

Error code 20 on an Amana oven indicates that the control board has detected an open circuit in the RTD (Resistance Temperature Detector) sensor circuit. The RTD is a probe-style temperature sensor, typically made from platinum or a similar resistive material, that monitors oven cavity temperature by changing its electrical resistance in a predictable way as temperature rises or falls. The control board reads the resistance value from this sensor continuously during operation. When the circuit is open, meaning the electrical path between the sensor and the control board is completely broken, the board cannot receive any resistance reading and triggers error code 20.

An open circuit condition can occur at several points in the sensor circuit. The RTD sensor itself may have failed internally, causing the resistance element inside the probe to break. The wiring harness connecting the sensor to the control board may have a broken wire, a burnt connector, or a terminal that has pulled free from its housing. In some cases, the connector at the sensor end or the board end may be corroded or loose, interrupting continuity without a visible wire break.

Because the oven relies on continuous temperature feedback from the RTD to regulate the bake and broil elements, an open circuit condition will prevent the oven from heating safely or at all. The control board cannot determine whether the oven is overheating or at safe operating temperature without a valid sensor signal. Diagnosing this code requires a multimeter to check continuity and resistance across the RTD sensor and the wiring harness between the sensor and the control board.

Source: manufacturer service documentation.

Common causes of 20

  1. 01

    Failed RTD temperature sensor

    Part replacement

    The RTD probe itself has failed internally, breaking the resistive element inside the sensor. A functioning RTD sensor will show a measurable resistance when tested with a multimeter, typically around 1080 to 1100 ohms at room temperature for platinum-element sensors. A completely open reading indicates internal sensor failure.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wire harness running from the RTD sensor to the control board may have a broken conductor, often caused by heat damage, pinching, or a wire that has fatigued and snapped over time. Inspect the full length of the harness for visible breaks, burn marks, or melted insulation.

  3. 03

    Loose or corroded connector

    Wiring / connection

    Connectors at either the sensor end or the control board end of the harness can loosen or corrode over time, interrupting continuity. Unplug and firmly reseat connectors and inspect terminals for corrosion or bent pins before replacing any components.

  4. 04

    Pulled or backed-out terminal

    Wiring / connection

    Individual terminals inside a multi-pin connector can back out of their housing, breaking the circuit without any visible wire damage. Carefully inspect each terminal within the RTD circuit connector for proper seating.

  5. 05

    Faulty control board

    Part replacement

    If the RTD sensor and the full wiring harness both test correctly with a multimeter, the control board's sensor input circuit may have failed. This is the least common cause and should only be considered after ruling out the sensor and all wiring.

See the test procedure for each cause

Frequently asked questions about 20

What does 20 mean on a Amana oven?
Error code 20 on an Amana oven means the control board has detected an open circuit in the RTD temperature sensor circuit. The RTD sensor monitors oven cavity temperature by sending a resistance signal to the control board, and an open circuit means that signal path is completely broken. The oven cannot operate safely without a valid temperature reading, so heating will typically be disabled. The fault can be in the sensor itself, the wiring harness, or a connector.
Can I fix error code 20 on my Amana oven myself?
A knowledgeable DIYer can diagnose this code by using a multimeter to test continuity and resistance across the RTD sensor and its wiring harness. If the sensor reads open on a multimeter, the sensor itself can be replaced without specialized tools in most Amana oven models. Wiring repairs require more comfort working with appliance electrical components, and any work should be done with the oven fully unplugged from power.
Is it safe to use my Amana oven when error code 20 is showing?
No, it is not safe to operate the oven while error code 20 is active. The oven uses the RTD sensor to prevent overheating, and without a valid temperature signal, the control board cannot protect against runaway heating. Stop using the oven until the sensor circuit is repaired and the error is resolved.
Will resetting my Amana oven clear error code 20?
Resetting the oven by cutting power at the breaker or unplugging it for a few minutes may temporarily clear the display, but error code 20 will return as soon as the control board checks the RTD circuit again. The underlying open circuit fault must be repaired before the code will stay cleared.
How much does it cost to fix error code 20 on an Amana oven?
If the RTD temperature sensor is the cause, replacement sensors typically range from $20 to $60 for parts, depending on the specific model. Professional labor to diagnose and replace the sensor generally adds $100 to $200 to the total cost. If the control board is at fault, board replacement costs are considerably higher, often ranging from $150 to $350 or more for parts alone.

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