Roper Dishwasher Leaving White Film on Glasses: Hard... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) controls the water inlet valve, wash motor, heating element, and drain pump. Proper voltage and current are required for each component to function correctly. The MCU receives input from sensors, such as the water temperature sensor, to regulate the wash cycle. Hard water can cause scaling on the heating element, reducing its efficiency. A malfunctioning rinse aid dispenser won't properly introduce the rinse aid to neutralize hard water deposits.

Symptoms:

US homeowners are reporting a persistent white film or residue on their glasses and dishes after running a cycle in their Roper dishwasher, even after using detergent. This is happening despite cleaning the dishwasher regularly. The film is particularly noticeable on glassware and dark-colored plastics.

Possible Causes:

Hard water mineral deposits
Low rinse aid dispenser level or malfunction
Water temperature too low
Improper detergent usage
Faulty water softener (if equipped)
Recirculation pump failure (less common but possible)

Solution:

1

Check water hardness: Use a water hardness test kit to determine your water hardness in grains per gallon (GPG).
2

Adjust rinse aid dispenser: Ensure the rinse aid dispenser is filled and set to the appropriate level (usually between 3-5) based on your water hardness.
3

Verify water temperature: Use a thermometer to check the water temperature entering the dishwasher. It should be at least 120°F.
4

Inspect detergent: Use a dishwasher detergent specifically formulated for hard water. Avoid using too much detergent.
5

Check water inlet valve: Disconnect the water supply and inspect the water inlet valve screen for debris. Clean or replace as needed.
6

Inspect the spray arms: Remove and clean the spray arms to ensure they are not clogged with mineral deposits. Use a small wire or toothpick to clear any blockages.
7

Regenerate water softener: If your dishwasher is connected to a water softener, ensure it is properly regenerated with salt.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Exercise caution when working with electrical components, as 120V AC is present.

Prevention:

Regularly use a dishwasher cleaner to remove mineral deposits. Check and refill the rinse aid dispenser monthly. Ensure the water softener (if present) is functioning correctly and has sufficient salt. Periodically check the spray arms for clogs.

Expert Tip:

Roper dishwashers have a diagnostic mode. Consult the service manual for the specific button sequence for your model to access error codes. Error codes can help pinpoint the problem. Often pressing 'High Temp' and 'Heated Dry' simultaneously for 3 seconds will enter diagnostic mode.

Frequently Asked Questions

•How do I test the water inlet valve with a multimeter?

Disconnect power to the dishwasher. Access the water inlet valve. Disconnect the wires. Set your multimeter to ohms (resistance). Test across the terminals. You should see a resistance reading; an open circuit indicates a faulty valve. Typical resistance is between 500 ohms and 1.5k ohms.

•What is the proper setting for the rinse aid dispenser?

The rinse aid dispenser setting depends on your water hardness. Start with a setting of 3. If you still see spotting, increase the setting. If you see excessive suds, decrease the setting. Experiment to find the optimal setting for your water.

•How do I manually clean the inside of the dishwasher to remove hard water buildup?

Pour 1 cup of white vinegar into a dishwasher-safe bowl and place it on the top rack of the empty dishwasher. Run the dishwasher on a hot water cycle. Alternatively, you can use a commercial dishwasher cleaner according to the manufacturer's instructions. Regularly scraping food particles can help with this process.

Roper Dishwasher Leaving White Film on Glasses: Hard Water Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the water inlet valve with a multimeter?

•What is the proper setting for the rinse aid dispenser?

•How do I manually clean the inside of the dishwasher to remove hard water buildup?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: