Booking today · Miami, Los Angeles, Houston, New York and San Diego · three-hour arrival windows Independent commercial equipment repair · Every maker on this site Mon–Fri 7:00 AM - 8:00 PM · Sat 8:00 AM - 6:00 PM
(844) 393-0816 Schedule a Visit
Error code · ACP Amana · High-speed ovens

ACP Amana High-Speed Oven Error Code H3: Main Board

H3 on an Amana Xpress AXP22 or MXP22 touch panel oven is another main board code, and the maker table lists replacing the board, as it does for A0 and H2. The oven stops because the control cannot trust the board. Pull the plug, wait a moment, replug, and call us if H3 shows again.

Medium · inspection needed

Medium: the oven stops because the board cannot be trusted, but leaving it off is safe.

Schedule a Visit(844) 393-0816
Code
H3
Maker
ACP Amana
Equipment
High-speed ovens
Applies to
AXP22 / MXP22 (touch panel)

What does ACP Amana error code H3 mean?

H3 joins A0 and H2 as a main board entry. The main board runs the magnetrons, the heater and the fans, and the control stops the oven because it can no longer trust the board that does all that. The maker table lists replacing the main board for H3, as it does for A0 and H2. H3 shows on the display. The manual's list names a main board that the maker tables list for replacement, a harness plug loose or burned at the main board, unstable outlet power that has stressed the board, and heat or damp damage inside the board area. The owner step is to pull the plug, then push it in again after a short pause. If H3 shows again, keep the oven switched off and call us. Tell us whether the lights flickered or a breaker tripped beforehand, because surges damage boards. The board is inside the sealed body next to high voltage parts, so nobody should open it, and a technician checks the supply and harness before condemning the board.

Affected models and control systems

This applies to the Amana Xpress AXP22 and MXP22 touch panel combination ovens, as covered in the ACP Commercial Service and Training Manual. The older AXP20/MXP20 list H-2 and H-3 together.

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

  • H3 on the display
  • The oven stops and will not continue
  • The oven will not start a new program
  • The code returns after replugging

Possible causes

Listed in ACP Amana's documentation

  • Main board failed and due for replacement
  • Harness plug loose or burned at the main board
  • Unstable outlet power stressing the board
  • Heat or damp damage in the board area

Other likely causes — what usually sits behind error code H3 on this control. A technician confirms which one it is before any part is replaced.

  • A breaker or wiring on the oven's circuit that trips or sags, dropping the board's supply during heating
  • A harness plug at the board with a loose terminal that arcs lightly under load

Safe checks before calling for service

✓ What an operator can do
  1. Pull the plug, then push it in again after a short pause.
  2. If H3 shows again, keep the oven switched off and call us.
  3. Tell us whether the lights flickered or a breaker tripped beforehand.
  4. Do not open the sealed body.
  5. Note how long the oven ran before H3.

How a technician diagnoses error code H3

  1. Read the code and confirm it repeats.
  2. Check outlet voltage idle and under load.
  3. Inspect the harness plugs for burned terminals.
  4. Check the board for damp and heat damage.
  5. Replace the main board after the supply and harness are sound.
! Leave this to a technician
  • The board is inside the sealed body next to high voltage.
  • Supply problems must be found or they return after a new board is fitted.
  • The maker table lists board replacement, which is technician work.

How error code H3 differs from similar codes

A0 and H2 are also main board entries on this oven. H3 is listed on its own, and the maker table gives the same replacement action.

Technical reference

Document
ACP Commercial Service and Training Manual
Edition
December 2011, 16400012
Models / control
AXP22 / MXP22 (touch panel)
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.

→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 3ACP Amana ACE14 / MCE14 Oven Error 3: High-Voltage BoardError 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 Board
H3Questions about ACP Amana error code H3
Do A0, H2 and H3 all mean a bad board?

They all point to the main board, and the maker table lists replacement for each. We test supply and harness first.

Can a power surge cause H3?

Yes. Surges damage boards, so tell us about flickering lights or tripped breakers.

Is a restart enough?

A restart is fine once. If H3 returns, the oven should stay off.

Book a visit

Need help with ACP Amana error code H3?

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

(844) 393-0816
Open the booking form
☎ Call our office ▤ Schedule a Visit