Frigidaire Dishwasher Water Supply Line Leak: Brass vs.... | appliancefaults.com

Technical Background:

The Frigidaire dishwasher's water inlet valve is typically controlled by the Main Control Unit (MCU). When the MCU signals the valve to open (usually with 120V AC), it allows water to flow into the dishwasher. Leaks often occur at the threaded connection between the supply line fitting and the valve body, either due to damaged threads, a worn-out sealing washer, or material incompatibility (brass fitting on a plastic valve).

Symptoms:

The homeowner observes water leaking from the connection point where the water supply line meets the dishwasher's water inlet valve. The leak may be a slow drip or a steady stream, depending on the severity and the water pressure.

Possible Causes:

Cracked or damaged plastic inlet valve housing.
Deteriorated rubber sealing washer or O-ring.
Loose connection between the water supply line and the inlet valve.
Cross-threading of the fitting during system.
Brass fitting corroding the plastic threads over time (electrolysis).
Excessive water pressure.

Solution:

1

Turn off the water supply to the dishwasher at the shut-off valve under the sink.
2

Disconnect the power to the dishwasher at the breaker panel (LOTO).
3

Carefully disconnect the water supply line from the inlet valve using a wrench (usually 1/2 inch or 9/16 inch).
4

Inspect the threads on both the fitting and the valve for damage. Check the rubber washer for cracks or wear.
5

If the plastic valve body is cracked, replace the entire water inlet valve assembly. Use a 1/4-inch nut driver to remove any mounting screws.
6

If the threads are intact but the washer is worn, replace the washer with a new one. Use Teflon tape on the threads for a better seal.
7

Reconnect the water supply line to the inlet valve, tightening the fitting snugly but not overtightening (to avoid cracking the plastic). Restore power to the unit at the breaker panel. Turn the water supply back on slowly and check for leaks.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before working on any electrical components. Lockout/Tagout (LOTO) procedures must be followed. Water and electricity are a dangerous combination. Verify there is no voltage present using a multimeter before touching any components.

Prevention:

Periodically check the water supply line and fitting for any signs of leaks. Replace the rubber washer every 2-3 years or when replacing the water inlet valve.

Expert Tip:

Many Frigidaire dishwashers have a diagnostic mode. Press and hold the 'Start/Cancel' and 'Options' buttons simultaneously for 3 seconds to enter the service mode. Navigate to the water inlet valve test to verify proper operation after the repair.

Follow-up Questions:

Frequently Asked Questions

•What is the correct torque specification for the water supply line fitting on a plastic inlet valve?

Generally, tighten the fitting snugly by hand and then another 1/4 turn with a wrench. Avoid overtightening, which can crack the plastic. If a torque wrench is available, consult the service manual for the specific model, but a general recommendation is 10-15 inch-pounds.

•Can I use a metal (copper) water supply line instead of a flexible braided line?

Yes, a copper supply line can be used, but it requires proper fittings and installation to prevent leaks and corrosion. Ensure a dielectric union is installed to prevent galvanic corrosion between dissimilar metals (copper and the valve's material).

•How can I test the water inlet valve to make sure it's working correctly after replacing the fitting?

After reconnecting the water and power, run a short wash cycle. Listen for the valve to open and allow water to enter the dishwasher. Also, use a multimeter to check for 120V AC at the valve terminals during the water fill cycle. If no voltage is present when the valve should be open, there may be an issue with the control board or wiring.

Frigidaire Dishwasher Water Supply Line Leak: Brass vs. Plastic Fitting Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct torque specification for the water supply line fitting on a plastic inlet valve?

•Can I use a metal (copper) water supply line instead of a flexible braided line?

•How can I test the water inlet valve to make sure it's working correctly after replacing the fitting?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: