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Error code · ACP Amana · High-speed ovens

ACP Amana Oven Error Code M-1: Magnetron 1 Low Current (AXP20)

M-1 on an older Amana Xpress AXP20 or MXP20 oven means magnetron 1 draws low amps. A weak magnetron heats food more slowly, and the oven may stop programs that call for full microwave power. Turn it off at the plug, let it cool, clean the filter and vents, and call us for the service test.

Medium · inspection needed

Medium: one magnetron is weak, so the oven is slower but usable until it is tested.

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Code
M-1
Maker
ACP Amana
Equipment
High-speed ovens
Applies to
AXP20 / MXP20 (earlier AXP; listed in the AXP20 error table)

What does ACP Amana error code M-1 mean?

This oven has two magnetrons, and the service test checks magnetron 1 by itself. M-1 appears when magnetron 1 draws low amps, meaning it is producing less microwave power than it should. A weak magnetron means slower heating, and the oven may stop programs that call for full microwave power. The manual's list names a weak magnetron 1 that draws too little current, a high-voltage transformer or diode that feeds magnetron 1 poorly, a burned connector on the magnetron 1 supply wiring, and a current sense circuit that misreads the magnetron 1 draw. The owner steps are to turn off the oven at the plug and give it time to cool, then clean the filter and clear the vents, and think about whether food has been heating more slowly lately. Magnetron 1 is the one in question; do not run the oven hard until it is checked. The microwave section stores a charge and uses very high voltage, so the body stays closed and a technician runs the magnetron 1 service test.

Affected models and control systems

This applies to the older Amana Xpress AXP20 and MXP20 touch pad combination ovens, as listed in the ACP Commercial Service and Training Manual's AXP20 error table. M-2 names the second magnetron, and M-0 is the general entry.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • M-1 on the display
  • Food heats more slowly than before
  • Programs needing full power stop early
  • The oven otherwise runs normally

Possible causes

Listed in ACP Amana's documentation

  • Magnetron 1 weak and drawing too little current
  • High-voltage transformer or diode feeding magnetron 1 poorly
  • Magnetron 1 supply connector burned
  • Current sense circuit misreading the magnetron 1 draw

Other likely causes — what usually sits behind error code M-1 on this control. A technician confirms which one it is before any part is replaced.

  • A magnetron whose output has slowly dropped after years of heavy use in a busy kitchen
  • A burned terminal at the magnetron 1 supply that adds resistance and starves it

Safe checks before calling for service

✓ What an operator can do
  1. Turn off the oven at the plug and give it time to cool.
  2. Clean the filter and clear the vents.
  3. Think about whether food has been heating more slowly lately.
  4. Do not run the oven hard until it is checked.
  5. Keep the body closed; the microwave section stores a charge.

How a technician diagnoses error code M-1

  1. Read the code and ask about cooking times.
  2. Run the service test on magnetron 1 alone.
  3. Check the transformer and diode feeding magnetron 1.
  4. Inspect the supply wiring and connector for burning.
  5. Replace the magnetron or feed part that fails, then retest.
! Leave this to a technician
  • The microwave section uses very high voltage and stores a charge, so the body must stay closed.
  • The magnetron 1 service test is run by a technician.
  • A burned connector can look like a weak magnetron.

How error code M-1 differs from similar codes

M-2 names magnetron 2, and M-0 is the general low-current entry. M-1 is specific to magnetron 1.

Technical reference

Document
ACP Commercial Service and Training Manual
Edition
December 2011, 16400012
Models / control
AXP20 / MXP20 (earlier AXP; listed in the AXP20 error table)
Section
Display Diagnostics - Error Codes: AXP20/MXP20 (hyphenated codes, M-0 to M-2) printed p. 58 (PDF p. 65); AXP22/MXP22 printed p. 74 (PDF p. 81)
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

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M-1Questions about ACP Amana error code M-1
Is the oven unsafe with M-1?

The risk is in opening it, not in a weak magnetron. Leave the body closed and have it tested.

Why is cooking slower?

Magnetron 1 is making less microwave power, so food takes longer.

Is M-1 a bad magnetron for sure?

Not always. The transformer, diode or supply wiring can give the same reading.

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Need help with ACP Amana error code M-1?

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