Hotpoint Dishwasher Error Code 6-4: Float Switch... | appliancefaults.com

Technical Background:

The dishwasher's MCU (Main Control Unit) monitors the float switch. This switch is designed to activate when water levels become too high, preventing overflow. When the MCU detects a sustained high signal from the float switch indicating an overflow, it triggers the 6-4 error code. This error typically disables the dishwasher and activates the drain pump. The MCU sends a low voltage signal (typically 5V DC) to the float switch, and the return signal confirms the switch's state.

Symptoms:

The homeowner reports the dishwasher stopping mid-cycle, displaying a 6-4 error code on the control panel. Water may be present in the bottom of the tub even when the dishwasher is not running. The dishwasher might also be making unusual noises during operation.

Possible Causes:

Float switch stuck in the up position.
Excessive suds in the dishwasher.
Water inlet valve leaking.
Drain pump malfunctioning, causing backflow.
Clogged drain line.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Open the dishwasher and check for excessive suds. If present, remove them with a sponge and clean the sump area.
3

Locate the float switch. It's usually at the bottom of the dishwasher tub. Manually move the float up and down to ensure it moves freely. Clean any debris.
4

Check the water inlet valve for leaks. Disconnect the water supply line (usually 3/8-inch compression fitting) and inspect the valve for drips or signs of damage.
5

Inspect the drain hose for clogs or kinks. Disconnect it from the drain pump and check for obstructions.
6

Test the float switch with a multimeter. It should show continuity when the float is up and open when down. Replace if faulty.
7

Reconnect power and run a short test cycle to confirm the error is resolved.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Dishwashers operate on 120V AC, which can cause serious injury or death. Follow Lock Out/Tag Out (LOTO) procedures to ensure the circuit remains de-energized.

Prevention:

Use the correct amount of dishwasher detergent, avoid using regular dish soap, and periodically check and clean the float switch area to prevent debris buildup. Annually inspect the drain hose for kinks or obstructions.

Expert Tip:

Enter service mode by pressing and holding the 'Start/Reset' button for 5 seconds while simultaneously pressing another button (varies by model, consult service manual). This allows you to run diagnostic cycles and test individual components.

Frequently Asked Questions

•Where is the float switch located in my Hotpoint dishwasher?

The float switch is typically located at the bottom of the dishwasher tub, often near the sump area. It's usually a small, plastic component with a float that moves up and down.

•How do I test the float switch with a multimeter?

With the dishwasher unplugged, set your multimeter to the continuity setting. Disconnect the wires from the float switch. Place one probe on each terminal of the switch. Manually move the float up and down. You should see continuity when the float is in the up position and no continuity (open circuit) when the float is down.

•What type of detergent should I use in my dishwasher?

Use only detergents specifically designed for dishwashers. These detergents are low-sudsing and formulated to work effectively in dishwasher environments. Avoid using regular dish soap, as it will create excessive suds and can cause the overflow error.

Hotpoint Dishwasher Error Code 6-4: Float Switch Overflow Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the float switch located in my Hotpoint dishwasher?

•How do I test the float switch with a multimeter?

•What type of detergent should I use in my dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: