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Error code reference

Maytag Microwave Error Code E23

Preheat did not reach preset temperature within 30 minutes; preheat cycle canceled.

Maytag codesMaytag microwave codes

Preheat did not reach preset temperature within 30 minutes; preheat cycle canceled.

First step from the service manual

Check if convection heater or grill heater is unplugged; inspect wiring and PCB assembly.

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

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What E23 means on a Maytag microwave

E23 on a Maytag microwave indicates the control board monitored the preheat cycle and determined the cavity did not reach the target temperature within the 30-minute window. When this threshold is exceeded, the board cancels the preheat cycle and throws E23. The fault points directly to the convection heater or grill heater failing to generate adequate heat, or a break in the wiring or PCB assembly that prevents those components from receiving power or sending feedback to the control board.

For a homeowner, this means your microwave started a convection or grill preheat but gave up before reaching the set temperature. The oven essentially timed out waiting to get hot enough. This is not a standard microwave function issue, it only applies when you are using convection or grill cooking modes that require preheating. Standard microwave heating may still work normally.

The most common culprits are a disconnected or damaged wiring harness leading to the convection heater or grill heater, a failed heating element itself, or a faulty PCB assembly that cannot properly control or detect heater output. Because these components involve high-voltage circuits, any physical inspection beyond checking visible connections should be performed with the microwave unplugged.

Source: manufacturer service documentation.

Common causes of E23

  1. 01

    Disconnected convection or grill heater wiring

    Wiring / connection

    If the wiring harness to the convection heater or grill heater has come loose or separated, the heater receives no power and cannot raise the cavity temperature. This is the first thing to check per the diagnostic steps and requires no parts if the connector is simply reseated.

  2. 02

    Failed convection heater or grill heater element

    Part replacement

    A burned-out or open heating element will draw no current and produce no heat, causing the preheat cycle to time out and trigger E23. The element must be tested for continuity and replaced if it shows an open circuit.

  3. 03

    Damaged wiring harness between heater and PCB

    Part replacement

    Chafed, burned, or broken wires along the harness running from the heater assembly to the PCB can interrupt the power or signal path. This prevents the heater from operating at full capacity or at all, causing the 30-minute timeout.

  4. 04

    Faulty PCB assembly

    Part replacement

    If the control board cannot properly energize the relay or triac that switches power to the convection or grill heater, the heater will not activate regardless of element condition. A failed PCB is less common than wiring or element failure but will produce the same E23 result.

See the test procedure for each cause

Frequently asked questions about E23

What does E23 mean on a Maytag microwave?
E23 means the microwave attempted a convection or grill preheat cycle but the cavity did not reach the preset target temperature within 30 minutes. The control board canceled the preheat and displayed E23. This fault is specific to convection and grill heating modes and does not affect standard microwave operation.
How do I fix E23 on a Maytag microwave?
Start by unplugging the microwave and checking whether the convection heater or grill heater wiring harness is disconnected or visibly damaged. Reconnect any loose connectors and test again. If the wiring looks intact, use a multimeter to test the heating element for continuity. A reading of OL or no continuity means the element has failed and needs replacement. If both the wiring and element test good, the PCB assembly may need to be replaced.
Can I still use my Maytag microwave if it shows E23?
Standard microwave heating functions typically remain operational when E23 is active because the fault is tied specifically to the convection heater or grill heater, not the magnetron. You can use normal microwave modes, but convection and grill cooking modes will not complete a preheat cycle until the underlying fault is resolved. Do not attempt to use grill or convection modes repeatedly while the error persists, as doing so will not override the fault.
How much does it cost to fix E23 on a Maytag microwave?
If the fix is a loose wiring connector, there is no parts cost. A replacement convection or grill heating element typically runs between $30 and $80 depending on the model. A PCB assembly is the most expensive repair, usually between $80 and $180 for the part alone. If you are not comfortable working with high-voltage microwave components, a professional appliance technician will add a service call and labor fee, which commonly brings total repair cost to $150 to $300.
Is E23 on a Maytag microwave a serious problem?
E23 is a functional fault rather than a safety emergency. The control board detected that the heating system could not perform as required and shut the preheat cycle down as a protective measure. The issue should be diagnosed and repaired before using convection or grill modes again, but the microwave does not pose an immediate hazard when the error is present. Inspect the wiring and heating element before assuming the PCB needs replacement, as those components are the most frequent causes.

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