Whirlpool AccuBake Oven Temperature Too Low: Broil... | appliancefaults.com

Technical Background:

The Whirlpool AccuBake system relies on the oven control board (MCU) to precisely regulate oven temperature. The MCU receives input from the oven temperature sensor (RTD) and controls the broil and bake elements via relays. Voltage is supplied to the broil element based on the set temperature and the RTD feedback. Failure of the RTD, broil element, or the MCU itself can lead to inaccurate temperatures.

Symptoms:

The oven is taking longer to preheat, food is undercooked, and the oven temperature is significantly lower than the set temperature. The broil function may be weak or non-existent.

Possible Causes:

Faulty broil element
Defective oven temperature sensor (RTD)
Malfunctioning oven control board (MCU)
Miscalibration of oven temperature
Weak or failing igniter (gas ovens)
Wiring harness issues

Solution:

1

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

Locate the broil element at the top of the oven cavity.
3

Visually inspect the broil element for any breaks, blisters, or damage.
4

Using a multimeter, measure the resistance across the broil element terminals. A typical resistance range is between 15-30 ohms. Open circuit indicates a failed element.
5

Check the oven temperature sensor (RTD) resistance. At room temperature (75°F), the resistance should be approximately 1080 ohms. Refer to the service manual for the exact resistance chart.
6

Inspect the wiring harness connecting the broil element and RTD to the oven control board (MCU) for any loose connections or damaged wires.
7

If the element and sensor test good, suspect a faulty oven control board (MCU). Replacement may require licensed technician assistance.

Safety Warning:

Disconnect power to the oven at the breaker panel before performing any repairs. High voltage (120V AC or 240V AC) is present within the oven. Use extreme caution when working with electrical components. Lock Out / Tag Out (LOTO) procedures must be followed.

Prevention:

Avoid using abrasive cleaners inside the oven. Regularly clean the oven interior to prevent buildup that can affect temperature sensing. Periodically check the oven temperature calibration using an oven thermometer.

Expert Tip:

Many Whirlpool ovens have a service mode that allows you to run diagnostic tests and calibrate the oven temperature. Consult the service manual or search online for the specific key sequence for your model.

Frequently Asked Questions

•What is the proper resistance range for the oven temperature sensor (RTD) at different temperatures?

The resistance of the RTD varies with temperature. Refer to the Whirlpool service manual for your specific model. A typical RTD will read around 1080 ohms at 75°F. You can find resistance charts online or in the service manual.

•How do I access the oven control board (MCU) to inspect the wiring harness?

Accessing the MCU usually involves removing the top or back panel of the oven. Disconnect power first. The location varies by model, so consult the service manual. Common fasteners are 1/4-inch hex head screws.

•If the broil element tests good, what else could be causing the weak broil function?

If the element tests good, check the relay on the oven control board that controls the broil element. A faulty relay may not be providing full voltage to the element. Also, ensure the oven is properly calibrated.

Whirlpool AccuBake Oven Temperature Too Low: Broil Element Test

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance range for the oven temperature sensor (RTD) at different temperatures?

•How do I access the oven control board (MCU) to inspect the wiring harness?

•If the broil element tests good, what else could be causing the weak broil function?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: