Roper Dishwasher Leaving White Film: Troubleshooting... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) controls the water inlet valve, heating element, dispenser, and motor. Voltage is supplied to these components based on sensor inputs like the thermistor for water temperature. Low water temperature or improper detergent dispensing can leave a white film.

Symptoms:

The homeowner observes a white, powdery or cloudy film on dishes after a complete wash cycle, even with rinse aid properly dispensed. This film is more noticeable on glassware and darker-colored dishes.

Possible Causes:

Hard water mineral deposits
Low water temperature
Detergent dispenser malfunction
Blocked spray arms
Faulty wash impeller
Incorrect detergent type or amount

Solution:

1

Test water hardness using a water hardness test kit. Aim for a reading below 7 grains per gallon.
2

Verify the water heater is set to at least 120°F. Use a thermometer to check the water temperature at the faucet nearest the dishwasher.
3

Inspect the detergent dispenser for clogs or damage. Clean with warm water and a small brush. Ensure it opens and closes freely.
4

Remove spray arms and check for obstructions. Rinse under running water. Use a small wire or pin to clear blocked nozzle holes.
5

Inspect the wash impeller for cracks or damage. Replace if necessary.
6

Use a high-quality dishwasher detergent formulated for hard water if applicable. Adjust detergent amount based on water hardness and load size. Usually 1-2 tablespoons is enough.
7

Run a cleaning cycle with a dishwasher cleaner according to the manufacturer's instructions.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. Lockout/Tagout (LOTO) procedures must be followed. High voltage components are present. Use caution when testing electrical components with a multimeter. Wear safety glasses.

Prevention:

Regularly clean the dishwasher filter. Add dishwasher cleaner monthly. Check the water softener if applicable and replenish salt as needed. Scrape food off dishes before loading.

Expert Tip:

Enter service mode by pressing the 'High Temp Wash' and 'Heated Dry' buttons simultaneously within 5 seconds. This will initiate a diagnostic cycle that may reveal hidden error codes related to water temperature or dispenser operation.

Frequently Asked Questions

•How do I test the water inlet valve?

Use a multimeter to test for continuity when the valve should be open. Disconnect power first. Should read approximately 1k ohms. If open or shorted, replace the valve.

•What is the correct water pressure for a dishwasher?

The ideal water pressure is between 20 and 120 PSI. If the pressure is too low, the dishwasher may not fill properly. Too high, and you could damage the valve.

•How do I descale the dishwasher?

Pour 1 cup of white vinegar into the bottom of the dishwasher and run a normal cycle without detergent. This will help remove mineral deposits. Repeat monthly.

Roper Dishwasher Leaving White Film: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the water inlet valve?

•What is the correct water pressure for a dishwasher?

•How do I descale the dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: