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Error code reference

Maytag Microwave Error Code Err1

Failed H.V

Maytag codesMaytag microwave codes

Failed H.V. Board or Shorted Touch Panel.

First step from the service manual

Replace H.V. board; if touch panel is shorted, replace touch panel. Before scheduling service, instruct customer to unplug oven for 1 minute, reconnect power, and retest.

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
  • Wiring diagram references and connector pinouts from the OEM service manual
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What Err1 means on a Maytag microwave

Err1 on a Maytag microwave indicates the control system has detected a fault in the high-voltage (H.V.) board or a shorted touch panel. The H.V. board is responsible for converting standard household current into the high-voltage power required to drive the magnetron, which generates the microwave energy used for cooking. A shorted touch panel means the membrane keypad is sending a continuous or erroneous signal to the control board, which the system interprets as a fault condition. Both faults trigger the same error code, so diagnosis requires identifying which component has failed.

For a homeowner, this error means your microwave has detected a problem with either the internal high-voltage electronics or the keypad you press to set cook times. The unit will not operate normally while this fault is active. In plain terms, the microwave's control system received a signal it could not interpret as a valid input, likely because something in the high-voltage circuit board has failed or because a button on the control panel is stuck or short-circuiting internally.

This error is not caused by a power surge reset or a minor software glitch. It points to a hardware failure in one of two specific components. Unplugging the unit and plugging it back in may temporarily clear the display, but the error will return if the underlying component is not replaced.

Source: manufacturer service documentation.

Common causes of Err1

  1. 01

    Failed H.V. Board

    Part replacement

    The high-voltage board has malfunctioned internally, preventing it from properly regulating or delivering power to the magnetron. This is the most likely cause and requires replacing the H.V. board to restore normal operation.

  2. 02

    Shorted Touch Panel

    Part replacement

    The membrane touch panel has developed an internal short, causing it to send a continuous or invalid signal to the control board. This can result from moisture intrusion, physical damage, or normal wear degrading the membrane contacts.

  3. 03

    Damaged Wiring Between Touch Panel and Control Board

    Wiring / connection

    A pinched, burned, or corroded wire harness connecting the touch panel to the main control board can mimic a shorted touch panel signal, triggering Err1. Inspecting and reseating or replacing the harness may resolve the fault.

  4. 04

    Control Board Communication Fault

    Part replacement

    If the main control board itself has failed and is misreading signals from the H.V. board or touch panel, it may generate Err1 even when those components are functioning correctly. This is less common but possible if replacing the H.V. board and touch panel does not clear the error.

See the test procedure for each cause

Frequently asked questions about Err1

What does Err1 mean on a Maytag microwave?
Err1 indicates the microwave has detected a failure in the high-voltage (H.V.) board or a shorted touch panel. The H.V. board manages the high-voltage power supply for the magnetron, and the touch panel is the membrane keypad on the front of the unit. Either component failing can trigger this specific code.
How do I fix Err1 on a Maytag microwave?
Start by replacing the H.V. board, as this is the most common cause of Err1. If the error persists after replacing the H.V. board, inspect the touch panel for signs of damage or shorting and replace it if necessary. Both repairs require disconnecting the microwave from power and discharging the high-voltage capacitor before working inside the unit, which stores a lethal charge even after unplugging.
Is it safe to use my Maytag microwave when Err1 is displayed?
No. Err1 points to a fault in the high-voltage board or touch panel, and the microwave will not function reliably or safely with this error active. A failed H.V. board can cause erratic behavior in the high-voltage circuit, which poses a fire and shock risk. Do not attempt to operate the microwave until the faulty component has been replaced.
How much does it cost to fix Err1 on a Maytag microwave?
A replacement H.V. board for a Maytag microwave typically costs between $40 and $120 depending on the model. A replacement touch panel generally runs $30 to $80. If you hire a technician, expect to add $75 to $150 in labor. Because the H.V. board and capacitor circuit carry lethal voltage, DIY repair is only advisable for those comfortable with high-voltage appliance work and proper capacitor discharge procedures.
Will unplugging my Maytag microwave clear the Err1 code?
Unplugging the microwave may temporarily clear the Err1 display, but the error will return once the unit is powered on if the underlying component has not been repaired. Err1 is a hardware fault code, not a software or memory error, so a reset does not address the failed H.V. board or shorted touch panel causing it.

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