Amana Oven Error Code 20

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.

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.

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.

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.

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.