Frigidaire Professional Dishwasher Smells Like Asphalt:... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) manages the wash cycles and heating element. Voltage is supplied from the breaker panel through the power cord to the junction box, then distributed to the motor, heating element, and other components. Proper voltage levels and continuity are essential for correct operation. Failures in these paths can cause overheating and component degradation.

Symptoms:

US homeowner reports a strong asphalt-like odor emanating from their Frigidaire licensed technician dishwasher, which features Luxury-Quiet insulation.

Possible Causes:

Overheated motor windings causing insulation breakdown
Failed heating element degrading nearby components
Wire harness insulation melting due to loose connection or high resistance
Deteriorating sound dampening insulation in the unit's cabinet

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Lockout/Tagout (LOTO) procedures must be followed.
2

Remove the lower access panel using a 1/4-inch nut driver. Inspect the motor for signs of overheating, such as melted plastic or burnt wires. Resistance check of the motor windings should be in manufacturer specifications. Replace if faulty.
3

Check the heating element. Visually inspect for cracks or blistering. Using a multimeter, test for continuity. A reading of around 15-20 ohms is typical. Replace if open or shorted.
4

Inspect the wiring harness, especially near the motor and heating element. Look for melted or brittle insulation. Repair or replace damaged sections using appropriately sized wire and connectors.
5

Examine the sound dampening insulation around the dishwasher's tub. If it's deteriorated or smells strongly of asphalt, replace it with new insulation designed for high-temperature appliance use. Ensure adequate ventilation around the dishwasher to prevent future overheating.
6

After repairs, power on the unit and monitor its operation. Check for unusual noises or smells. Verify the wash and dry cycles are functioning correctly.
7

Run a test cycle with a dishwasher cleaner to remove any residual odors.

Safety Warning:

Disconnect power to the dishwasher at the breaker before any repairs. High voltage is present when the dishwasher is powered on. Lockout/Tagout (LOTO) procedures must be followed.

Prevention:

Periodically inspect the dishwasher for leaks or unusual noises. Use the recommended amount of dishwasher detergent. Clean the filter regularly. Annually inspect the wiring connections for tightness.

Expert Tip:

To enter the service mode, press and hold the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 5 seconds. This allows you to run diagnostic tests and check for error codes.

Frequently Asked Questions

•What is the typical resistance reading for the motor windings in this model?

Consult the service manual for the exact specification. Generally, you'll see a few ohms, usually less than 10 ohms, across the main windings. An open or shorted reading indicates a faulty motor.

•What type of high-temperature insulation is recommended for replacing the original?

Use fiberglass or mineral wool insulation designed for appliance applications. Ensure it is non-combustible and rated for at least 300 degrees Fahrenheit.

•Where can I find a wiring diagram for this specific Frigidaire Professional dishwasher model?

The wiring diagram is usually located inside the dishwasher's control panel or in the service manual. You can often find the service manual online by searching for the model number.

Frigidaire Professional Dishwasher Smells Like Asphalt: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance reading for the motor windings in this model?

•What type of high-temperature insulation is recommended for replacing the original?

•Where can I find a wiring diagram for this specific Frigidaire Professional dishwasher model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: