ACP Amana Oven Error Code D-1: Thermocouple Shorted (AXP20)
D-1 on an older Amana Xpress AXP20 or MXP20 oven means the thermocouple reads shorted, so the overheating check cannot be trusted and the oven stops heating soon after it starts. Pull the plug, wait for the cavity to cool, and note how long the oven ran before D-1 appeared.
High: the overheating check cannot be trusted, so the oven should stay off until it is tested.
- Code
- D-1
- Maker
- ACP Amana
- Equipment
- High-speed ovens
- Applies to
- AXP20 / MXP20 (hyphenated codes)
What does ACP Amana error code D-1 mean?
The thermocouple is the oven's second sensor. While the RTD manages cooking temperature, the thermocouple lets the control confirm the cavity is not overheating. When the circuit is shorted, the control sees a reading that cannot be real, shows D-1, and stops trusting the overheating check, so it stops heating. D-1 stops the oven soon after it starts. A pinched wire, damaged insulation or moisture at the connector can cause it. The manual lists a thermocouple wire pinched in the cabinet, a lead with worn insulation, moisture at the plug shorting the circuit, and a main board input that reads the thermocouple as shorted. The maker's step is to pull the plug, wait for the cavity to cool and plug back in. Note how long the oven ran before D-1 appeared; a short that grows with heat points to insulation damage. Leave covers on and do not bend wires. The oven stays off until a technician has tested the circuit with a meter.
Affected models and control systems
This applies to the older Amana Xpress AXP20 and MXP20 touch pad combination ovens, which use hyphenated codes, as described in the ACP Commercial Service and Training Manual. The AXP22 and MXP22 spell this reading D1.
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
- D-1 on the display
- The oven stops soon after it starts
- No heating
- The oven runs longer on some days before stopping
Possible causes
Listed in ACP Amana's documentation
- Thermocouple wire pinched in the cabinet
- Thermocouple lead insulation worn
- Moisture at the thermocouple plug shorting the circuit
- Main board input reading the thermocouple as shorted
Other likely causes — what usually sits behind error code D-1 on this control. A technician confirms which one it is before any part is replaced.
- A thermocouple lead rubbed bare where it passes a sharp edge in the cabinet, touching metal when warm
- Condensation in the thermocouple plug after a wash-down, bridging two pins
Safe checks before calling for service
- Pull the plug, wait for the cavity to cool and plug back in.
- Note how long the oven ran before D-1 appeared; a short that grows with heat points to insulation damage.
- Leave covers on and do not bend wires.
- The oven stays off until a technician has tested the circuit.
- Tell us whether the oven was washed down recently.
How a technician diagnoses error code D-1
- Read the code and note the run time before it appears.
- Trace the thermocouple lead for pinches and worn insulation.
- Measure the circuit for a short, cold and warm.
- Check the plug for moisture and the board input.
- Repair or replace the lead, thermocouple or board according to the test.
- A short that appears with heat is hard to catch without a meter and repeated testing.
- The lead runs through the hot cabinet, so tracing it means opening the oven.
- Bending wires to look for the short can make the damage worse.
How error code D-1 differs from similar codes
D-0 is the open thermocouple reading and D-2 the out-of-range reading. The C codes cover the cooking RTD.
Technical reference
- Document
- ACP Commercial Service and Training Manual
- Edition
- December 2011, 16400012
- Models / control
- AXP20 / MXP20 (hyphenated codes)
- 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
Why does the run time matter?
If D-1 comes after longer use, heat is probably expanding a damaged wire until it touches metal.
Can I run the oven with D-1?
No. The overheating check cannot be trusted while the code shows.
Is moisture a possible reason?
Yes. The manual lists it, so mention any recent wash-down.
Need help with ACP Amana error code D-1?
A technician confirms the cause on site and gives you the price in writing before any work starts.