ACP Amana High-Speed Oven Error Code C0: Temperature Sensor Open
C0 on an Amana Xpress AXP22 or MXP22 touch panel oven means the temperature sensor (RTD) reads open, so the control cannot hold a cooking temperature and stops the program. Pull the plug and push it back in once the cavity has cooled, and keep the oven off if C0 returns.
Medium: the oven cannot heat reliably, but it can be left unplugged safely.
- Code
- C0
- Maker
- ACP Amana
- Equipment
- High-speed ovens
- Applies to
- AXP22 / MXP22 (touch panel)
What does ACP Amana error code C0 mean?
The oven reads cavity temperature through an RTD, a sensor that changes resistance as it heats. The control checks it constantly. With an open circuit the control sees no connection to the sensor, shows C0, and cannot hold a cooking temperature, so it stops the program. A loose connector or a broken wire is behind it. The manual lists a cavity RTD whose wire has broken or come loose, a loose RTD plug at the main board, a lead whose insulation has cracked from heat, and a main board input that reads the RTD as open. The owner step is to pull the plug and push it back in once the cavity has cooled. Check that no tray or foil is resting against the back wall of the cavity, where the sensor sits, but do not reach toward it. If C0 returns, the oven will not hold a temperature and should stay off. The sensor area is hot and the board carries high voltage. The reading is a sensing problem, not a heating one, so the magnetrons and heater are not what the code is reporting.
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 write this reading as C-0 with a hyphen.
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
- C0 on the display
- The oven does not hold a temperature
- A program stops soon after it starts
- The code returns each time
Possible causes
Listed in ACP Amana's documentation
- Cavity RTD wire broken or loose
- RTD plug loose at the main board
- RTD lead insulation cracked from heat
- Main board input reading the RTD as open
Other likely causes — what usually sits behind error code C0 on this control. A technician confirms which one it is before any part is replaced.
- A tray or foil that rested against the rear wall and pulled on the sensor lead until it came loose
- A sensor plug on the main board that has lost its grip after repeated heat cycles
Safe checks before calling for service
- Pull the plug and push it back in, once the cavity has cooled.
- Check that no tray or foil is resting against the back wall of the cavity, but do not reach toward the sensor.
- If C0 returns, the oven will not hold a temperature and should stay off.
- The sensor area is hot and the board carries high voltage.
- Note whether C0 showed at start-up or mid-program.
How a technician diagnoses error code C0
- Read the code and confirm it repeats cold.
- Inspect the cavity RTD and its lead for breaks or heat damage.
- Measure the RTD resistance at room temperature.
- Check the plug and board input for the RTD.
- Replace the RTD, lead or board that fails.
- The sensor sits on the hot cavity wall and has to be reached by opening the oven.
- An open circuit is proven with a meter, and the main board carries high voltage.
- The plug, the lead and the board input all give the same C0, so each must be tested before one is replaced.
How error code C0 differs from similar codes
C1 is the shorted reading and C2 the out-of-range reading from the same sensor on this oven. C0 is the open one.
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.
Related ACP Amana high-speed oven error codes
What is the difference between C0 and C-0?
C0 is the AXP22/MXP22 spelling. The older AXP20/MXP20 show it as C-0. The meaning is the same.
Can I put a tray back and try again?
After the cavity cools, yes, once. If C0 returns, stop.
Is the sensor the only possibility?
No. The plug and the board input can also read open, which is why the circuit is tested before parts are replaced.
Need help with ACP Amana error code C0?
A technician confirms the cause on site and gives you the price in writing before any work starts.