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Error code reference

Amana Microwave Error Code E22

Thermal sensor short error.

Amana codesAmana microwave codes

Thermal sensor short error.

First step from the service manual

Check sensor connection, wiring, or PCB.

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
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What E22 means on a Amana microwave

The E22 error code on an Amana microwave indicates a thermal sensor short condition. The thermal sensor, also called a thermistor, is a temperature-monitoring component responsible for measuring heat levels inside the microwave cavity or near critical components. When the control board detects that the sensor's resistance has dropped to an abnormally low level, consistent with a short circuit rather than a valid temperature reading, it triggers this fault code and halts operation to prevent damage or overheating.

A shorted thermal sensor typically presents with a resistance reading that falls well below the expected range for the ambient or operating temperature. In a properly functioning circuit, the thermistor's resistance changes predictably with temperature. A short causes the resistance to collapse, sending a signal to the PCB that the appliance is at an impossibly high temperature, or simply producing an out-of-range reading the board cannot interpret as valid.

The first diagnostic step is to inspect the sensor's wiring harness and connector for signs of damage, pinched wires, or corrosion at the terminals. If the connections appear sound, the sensor itself should be tested with a multimeter for a shorted condition. If the wiring and sensor both check out, the PCB may be misreading the sensor signal due to a faulty input circuit on the control board itself.

Source: manufacturer service documentation.

Common causes of E22

  1. 01

    Faulty or shorted thermal sensor

    Part replacement

    The thermistor itself may have failed internally, creating a short circuit across its terminals. Testing the sensor with a multimeter will show abnormally low or near-zero resistance regardless of temperature.

  2. 02

    Damaged sensor wiring or harness

    Part replacement

    Wires leading to the thermal sensor can become pinched, melted, or abraded inside the microwave cavity or chassis. Inspect the full length of the wiring harness for contact with hot surfaces or mechanical damage.

  3. 03

    Corroded or loose sensor connector

    Wiring / connection

    The connector that joins the thermal sensor to the main wiring harness can develop corrosion or back out of its socket, causing an intermittent or continuous short reading at the PCB input.

  4. 04

    Faulty PCB or control board

    Part replacement

    If the sensor and all associated wiring test correctly, the PCB's sensor input circuit may have failed and is generating a false short reading. This requires control board replacement.

See the test procedure for each cause

Frequently asked questions about E22

What does E22 mean on a Amana microwave?
E22 on an Amana microwave signals a thermal sensor short error. The control board has detected that the thermal sensor circuit is reading a shorted condition rather than a valid resistance value. This causes the microwave to stop operating as a safety precaution. The fault points to the sensor, its wiring, connectors, or the PCB.
Can I fix the E22 error on my Amana microwave myself?
A knowledgeable DIYer can begin by inspecting the sensor wiring harness and connector for visible damage or loose connections, which does not require special tools. Testing the thermal sensor with a multimeter to check for a shorted condition is also a straightforward step. However, working inside a microwave carries a serious risk of electric shock from stored capacitor charge, so anyone unfamiliar with safely discharging microwave capacitors should have a qualified technician perform the repair.
Is it safe to use my Amana microwave while the E22 code is displayed?
No, you should not attempt to use the microwave while E22 is active. The microwave typically locks out operation when this code appears specifically to prevent unsafe conditions related to unmonitored heating. Continue to keep the unit unplugged until the fault has been diagnosed and corrected.
How much does it cost to repair an E22 error on an Amana microwave?
Repair costs vary depending on the root cause. A replacement thermal sensor is generally an inexpensive part, typically in the range of $10 to $40 for the component alone. If the control board requires replacement, parts can range from $60 to $150 or more. Adding professional labor, total repair costs commonly fall between $80 and $250 depending on the failed component and service rates in your area.
Will resetting my Amana microwave clear the E22 error code?
Unplugging the microwave for a few minutes and restoring power may temporarily clear the E22 code, but it will return if the underlying fault in the thermal sensor circuit has not been corrected. A reset does not repair a shorted sensor, damaged wiring, or a faulty PCB. The root cause must be identified and resolved to permanently clear the code.

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