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Error code · ACP Amana · High-speed ovens

ACP Amana ACE14 / MCE14 Oven Error 3: High-Voltage Board

Error 3 on an Amana ACE14 or MCE14 touch pad speed-cook oven means the high-voltage board has failed. That board feeds the magnetron and the heater, so the oven cannot cook. Unplug it for one minute and test it, then switch it off at the plug and leave it if Error 3 returns.

Medium · inspection needed

High: the oven cannot cook, and the board involved works at high voltage.

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Code
Error 3
Maker
ACP Amana
Equipment
High-speed ovens
Applies to
ACE14 / MCE14 (touch pad speed-cook oven)

What does ACP Amana error 3 mean?

The high-voltage board is the part that feeds the magnetron and the heater. The control talks to it, and Error 3 appears when the control determines that the board has failed. Without a working high-voltage board the oven cannot cook, so it stops rather than try. The manual points to a board that has failed and cannot feed the magnetron, a loose or burned connector on the board's heater feed, a failed link between the display board and the high-voltage board, and damage on the board that cuts power to the heater. The maker advises unplugging the oven for a full minute and reconnecting it, then testing again before calling. That helps only if the board's link was disturbed momentarily. If Error 3 returns, switch the oven off at the plug and leave it. The high-voltage board holds charge, even unplugged, so nobody should open the oven. Nothing about the error is something an operator can see or reach, and attempting to look inside could cause serious injury.

Affected models and control systems

This applies to the Amana ACE14 and MCE14 touch pad speed-cook ovens, as covered in the ACP Commercial Service and Training Manual. Other ACP oven families report high-voltage board problems with different codes.

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

  • Error 3 on the display
  • The oven will not heat or cook
  • The error returns after a one-minute unplug
  • A burned smell near the oven

Possible causes

Listed in ACP Amana's documentation

  • High-voltage board failed and cannot feed the magnetron
  • Heater feed connector on the board loose or burned
  • Link between the display board and the high-voltage board failed
  • Board damaged so that power to the heater is cut

Other likely causes — what usually sits behind error 3 on this control. A technician confirms which one it is before any part is replaced.

  • A heater feed connector that has overheated and left a carbon track across its pins
  • A high-voltage board whose output has failed after repeated hard starts

Safe checks before calling for service

✓ What an operator can do
  1. Unplug the oven for a full minute and reconnect it, then test it as the maker advises.
  2. If Error 3 returns, switch the oven off at the plug and leave it.
  3. Do not open the oven, even unplugged.
  4. Call us and tell us about any burned smell.
  5. Keep the oven unplugged until we arrive.

How a technician diagnoses error 3

  1. Read the error and confirm it repeats after a power-up.
  2. With the oven unplugged and the capacitor discharged, inspect the board and heater connectors for burn marks.
  3. Check the link between the display board and the high-voltage board.
  4. Test the board's outputs once discharged.
  5. Replace the high-voltage board, connector or link that fails.
! Leave this to a technician
  • The high-voltage board holds charge even when the oven is unplugged, so opening it risks a serious shock.
  • It feeds the magnetron, so an error here can mean real damage that needs a trained technician.
  • Discharging and testing the board safely needs proper tools and training.

Technical reference

Document
ACP Commercial Service and Training Manual
Edition
October 2012, 16400018
Models / control
ACE14 / MCE14 (touch pad speed-cook oven)
Section
Display Diagnostics - Error Codes, printed p. 33 (PDF p. 60)
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.

→Same maker

Related ACP Amana high-speed oven error codes

Error 1U / Error 1FACP Amana ACE14 / MCE14 Oven Error 1U / Error 1F: Memory Not FoundError 2ACP Amana ACE14 / MCE14 Oven Error 2: Memory Not ProgrammedError 4ACP Amana ACE14 / MCE14 Oven Error 4: High-Voltage BoardError 5ACP Amana ACE14 / MCE14 Oven Error 5: Panel Short or Wrong BoardError 6ACP Amana ACE14 / MCE14 Oven Error 6: Options ScrambledError 7-OACP Amana ACE14 / MCE14 Oven Error 7-O: Temperature Sensor OpenError 7-SACP Amana ACE14 / MCE14 Oven Error 7-S: Temperature Sensor ShortedDoor OpenACP Amana ACE14 / MCE14 Oven Message: Door OpenError - Control TCO open / Oven too hotACP Amana ACE14 / MCE14 Oven: Control TCO Open / Oven Too HotA0ACP Amana High-Speed Oven Error Code A0: Main BoardA2ACP Amana High-Speed Oven Error Code A2: Display BoardB0ACP Amana High-Speed Oven Error Code B0: Touch Panel
Error 3Questions about ACP Amana error 3
Is Error 3 dangerous?

The board works at high voltage and holds charge, so do not open the oven. Switch it off at the plug.

Can unplugging fix it?

The maker advises it once. If Error 3 returns, the board needs a technician.

Is the magnetron broken?

Not necessarily. Error 3 points to the board that feeds it.

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Need help with ACP Amana error 3?

A technician confirms the cause on site and gives you the price in writing before any work starts.

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