ACP Amana ACE14 / MCE14 Oven Error 7-O: Temperature Sensor Open

What does ACP Amana error 7-o mean?

The RTD tells the control how hot the cavity is. On the ACE14 and MCE14 its wiring runs to the high-voltage board, and the control checks the circuit continuously. Error 7-O appears when the circuit is open, which means the control sees no connection to the sensor. It cannot read the cavity temperature, so it stops heating. The error stays until power is cycled, and a technician checks the RTD and the wiring to the high-voltage board. The manual lists a broken wire inside the cavity RTD temperature sensor, a loose RTD plug at the high-voltage board, a corroded connector that breaks the circuit, and a board input that reads the open sensor wrongly. The maker advises unplugging the oven for one minute and testing again before a service call. Make sure no tray is jammed against the rear of the cavity. If Error 7-O returns, the oven cannot read its temperature and should stay off. The sensor area is hot and the high-voltage board is live, so nobody should reach into the oven.

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. The letter O marks the open reading on these ovens, and the S version is the shorted one.

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 7-O on the display
• Heating stops
• The error stays until power is cycled
• The error returns at the next start

Possible causes

Listed in ACP Amana's documentation

• Break in the wire inside the cavity RTD temperature sensor
• RTD plug loose at the high-voltage board
• Connector corroded, breaking the RTD circuit
• Board input reading the open sensor wrongly

Other likely causes — what usually sits behind error 7-o on this control. A technician confirms which one it is before any part is replaced.

• A tray jammed against the rear cavity wall that bent the sensor lead until its wire broke
• A connector at the high-voltage board that has corroded in a steamy kitchen and lost contact

Safe checks before calling for service

How a technician diagnoses error 7-o

1. Read the error and confirm it repeats cold.
2. Inspect the cavity RTD and its lead for breaks.
3. Measure RTD resistance at room temperature.
4. Check the plug at the high-voltage board and the board input.
5. Replace the RTD, wiring or board that fails the test.

How error 7-o differs from similar codes

Error 7-S is the shorted reading from the same sensor. Error 7-O is the open one. The AXP20/AXP22 families use the C codes for this sensor.

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.