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Error code reference

Amana Microwave Error Code E24

Microwave temperature reaches 500°F (260°C) in an overheat condition; microwave cancels all functions.

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Microwave temperature reaches 500°F (260°C) in an overheat condition; microwave cancels all functions.

First step from the service manual

Check thermal or gas sensor, 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 E24 means on a Amana microwave

The E24 error code on an Amana microwave indicates that the internal cavity temperature has reached or exceeded 500°F (260°C), triggering an overheat protection condition. When this threshold is detected, the control board immediately cancels all active functions to prevent damage to internal components and reduce fire risk. This is a safety-driven shutdown, not a nuisance fault, and the unit will not resume operation until the fault condition is resolved.

The overheat condition is monitored by a thermal sensor or gas sensor positioned inside the microwave cavity or on the magnetron assembly. These sensors report temperature data back to the PCB (printed circuit board), which acts on that data to determine whether operating conditions are safe. If the sensor itself has failed and is sending an inaccurate high-temperature reading, the board may trigger E24 even when the actual cavity temperature is normal. Similarly, damaged or shorted wiring between the sensor and the PCB can produce false signals that mimic an overheat condition.

Actual overheat causes can include blocked ventilation preventing adequate airflow, a malfunctioning cooling fan, or prolonged high-power cooking cycles that push temperatures beyond safe limits. In cases where the temperature rise is genuine, the magnetron or its associated components may also be suspect. Diagnosis should begin by inspecting the thermal or gas sensor for continuity and proper resistance values, checking all associated wiring harnesses for damage or loose connections, and evaluating the PCB for visible signs of burning or component failure.

Source: manufacturer service documentation.

Common causes of E24

  1. 01

    Faulty thermal or gas sensor

    Part replacement

    A failed sensor can send incorrect high-temperature readings to the control board, triggering E24 even when the cavity is not actually overheating. Check the sensor for proper continuity and resistance values.

  2. 02

    Blocked or restricted ventilation

    Wiring / connection

    If the microwave's air vents are obstructed by grease buildup, debris, or improper installation clearance, heat cannot escape and the cavity temperature rises to dangerous levels. Inspect and clear all vent openings.

  3. 03

    Damaged or shorted wiring harness

    Part replacement

    Wiring between the thermal sensor and the PCB can develop shorts, breaks, or loose connectors that cause erroneous temperature signals. Inspect the harness for visible damage, melting, or disconnected terminals.

  4. 04

    Malfunctioning cooling fan

    Part replacement

    The cooling fan is responsible for drawing heat away from internal components during operation. If the fan motor has failed or the fan blade is obstructed, temperatures can climb rapidly and trigger the overheat shutdown.

  5. 05

    PCB failure

    Part replacement

    The control board itself may have a defect that causes it to misread sensor data or incorrectly trigger the overheat protection circuit. Look for visible signs of burning, scorched traces, or damaged components on the board.

See the test procedure for each cause

Frequently asked questions about E24

What does E24 mean on a Amana microwave?
E24 means the microwave has detected an internal temperature of 500°F (260°C) or higher, which activates an overheat protection shutdown. The unit cancels all functions automatically to prevent damage and reduce safety risks. The error points to a problem with the thermal or gas sensor, the wiring connecting it, or the PCB that processes those readings. The microwave will remain inoperable until the root cause is corrected.
Can I fix the E24 error myself on my Amana microwave?
Some causes, such as clearing blocked vents or checking for obvious wiring damage, can be addressed by a knowledgeable DIYer. However, testing the thermal sensor for correct resistance values, inspecting internal wiring harnesses, and evaluating the PCB require disassembly of the microwave. Microwaves contain high-voltage capacitors that can retain a lethal charge even when unplugged, so internal repairs should only be attempted by someone with proper training and discharge procedures.
Is it safe to keep using my Amana microwave when E24 appears?
No, you should not attempt to continue using the microwave while E24 is active. The error indicates a potential overheat condition that can damage internal components, degrade the magnetron, or in severe cases create a fire hazard. The unit is designed to cancel all functions when this code triggers, and bypassing or ignoring that shutdown is not safe.
Will resetting the microwave clear the E24 error?
A simple power reset by unplugging the unit or cycling the breaker may temporarily clear the error code, but it will return if the underlying cause has not been addressed. If the thermal sensor is defective, the wiring is damaged, or the PCB has a fault, the condition will persist or reappear during the next cooking cycle. A reset alone is not a repair.
How much does it cost to repair an Amana microwave showing E24?
Repair costs vary depending on which component has failed. A replacement thermal or gas sensor typically runs in the range of $15 to $50 for the part, while a new PCB can cost anywhere from $60 to $150 or more. If you hire a technician, add labor charges on top of parts costs. In some cases, particularly with older units, the total repair cost may approach or exceed the cost of a replacement microwave.

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