Whirlpool AccuBake Oven: Troubleshooting a Cold Heating... | appliancefaults.com

Technical Background:

MCU logic and voltage paths.

The AccuBake system utilizes the main control unit (MCU) to regulate the oven's temperature. The MCU monitors the oven temperature sensor (RTD) and cycles the bake element on and off to maintain the set temperature during preheat. If the MCU doesn't detect a temperature increase, or if any safety circuits are triggered, it may prevent the element from energizing. The element is supplied with 240V AC when the MCU determines it should be on.

Symptoms:

US homeowner observations.

The Whirlpool AccuBake™ oven display shows "Preheating," but the element remains cold. The oven does not heat up.

Possible Causes:

Failed oven bake element.
Defective oven temperature sensor (RTD).
Faulty oven control board (MCU).
Open thermal fuse or safety thermostat.
Wiring issue between the control board and the element or sensor.
Burnt wire connector on the element

Solution:

1

Disconnect power to the oven at the breaker panel (LOTO).
2

Using a multimeter, test the bake element for continuity. A good element typically reads between 15-30 ohms. If open (no continuity), replace the element.
3

Check the oven temperature sensor (RTD) resistance. At room temperature (70°F), it should read approximately 1080-1100 ohms. Check the tech sheet for the exact value. Replace if out of spec.
4

Inspect the thermal fuse or safety thermostat (usually located on the back of the oven). Use a multimeter to check for continuity. Replace if open.
5

Visually inspect the wiring and connections between the control board, element, and sensor for any signs of damage or loose connections. Repair or replace as needed.
6

If the element, sensor, thermal fuse, and wiring check out, the oven control board (MCU) may be faulty. Replace the control board.
7

After repairs, restore power and test the oven's preheating function.

Safety Warning:

LOTO and high voltage warning.

Disconnect power to the appliance at the breaker panel before performing any repairs. Ovens operate at 240V AC, which can cause serious injury or death. Always use proper safety precautions and wear appropriate personal protective equipment (PPE).

Prevention:

• Avoid placing heavy items on the oven door.

• Clean the oven regularly to prevent grease buildup that can damage components.

• Ensure proper ventilation around the oven to prevent overheating.

Expert Tip:

Trade secret or service mode sequence.

Many Whirlpool AccuBake ovens have a diagnostic mode. To access it, simultaneously press and hold the "Cancel" and "Start" buttons for 3 seconds. This will often display error codes related to the heating element or sensor.

Frequently Asked Questions

•How do I locate the thermal fuse on my Whirlpool AccuBake oven?

The thermal fuse is typically located on the back of the oven, often near the vent or exhaust area. It is a small, rectangular or cylindrical component with two wires connected to it. Consult your oven's wiring diagram for its precise location.

•What is the correct resistance value for the oven temperature sensor at different temperatures?

The resistance value of the oven temperature sensor (RTD) varies with temperature. Refer to the oven's technical service manual or wiring diagram for a temperature-resistance chart. At room temperature (70°F), it's typically around 1080-1100 ohms.

•How do I know if the oven control board is the problem?

The oven control board is usually the last component to suspect. First confirm that the element, sensor, thermal fuse, and wiring are all functioning correctly. If all other components test good, and the oven still fails to heat, the control board is likely the issue. You may also see erratic behavior from the display or other oven functions.

Whirlpool AccuBake Oven: Troubleshooting a Cold Heating Element During Preheating

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I locate the thermal fuse on my Whirlpool AccuBake oven?

•What is the correct resistance value for the oven temperature sensor at different temperatures?

•How do I know if the oven control board is the problem?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: