Roper Washer Error Code LF: Long Fill Troubleshooting... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) monitors the water level via the pressure switch. The MCU energizes the water inlet valves (hot and cold) with 120V AC based on water level feedback. If the pressure switch doesn't signal a sufficient water level within a set timeframe, the MCU throws the LF error and halts the wash cycle to prevent overflow or damage.

Symptoms:

The Roper washer displays an 'LF' error code, and the tub fills very slowly, or doesn't fill at all. The washer may take an excessively long time to start the wash cycle or might not start at all.

Possible Causes:

Clogged or kinked water inlet hoses
Defective water inlet valve (hot or cold)
Low water pressure (below 20 PSI)
Malfunctioning pressure switch
Blocked drain hose creating siphoning effect
Faulty Main Control Unit (MCU)

Solution:

1

Turn off the water supply to the washer at the shut-off valves.
2

Unplug the washer from the 120V AC outlet.
3

Disconnect the water inlet hoses from the back of the washer and inspect for clogs or kinks. Clean or replace as needed.
4

Using a multimeter, test the water inlet valve solenoids for continuity. A reading of approximately 1.3k ohms to 1.8k ohms is expected. Replace the valve if open or shorted.
5

Check the water pressure at the faucet. It should be at least 20 PSI. If not, contact a plumber.
6

Inspect the pressure switch and its hose for obstructions. Blow through the hose to ensure it is clear.
7

If all other components test good, the MCU may be faulty. Replace the MCU.

Safety Warning:

Always disconnect power to the appliance before attempting any repairs. Lock Out Tag Out (LOTO) procedures should be followed. Water and electricity are a dangerous combination. Verify the appliance is unplugged before working on any water-related components. High voltage is present when the unit is plugged in.

Prevention:

Periodically inspect and clean the water inlet hoses and the screens in the water inlet valve. Check the water pressure regularly. Avoid overloading the washer to prevent strain on the components.

Expert Tip:

To enter service mode on some Roper washers, press and hold the start/pause button for 3 seconds while simultaneously pressing the cycle selection knob three times within 5 seconds. This might allow you to run diagnostic tests or reset the error code, but it varies by model.

Frequently Asked Questions

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

Disconnect the power to the washer. Disconnect the wires to the water inlet valve solenoid. Set your multimeter to the ohms setting (usually 2000 ohms or higher). Place one probe on each terminal of the solenoid. A reading between 1.3k and 1.8k ohms indicates a good solenoid. An open circuit (no reading) or a short circuit (very low reading) indicates a faulty solenoid.

•Where is the pressure switch located on my Roper washer?

The pressure switch is usually located on the top of the outer tub, near the back. It has a small hose connected to it that runs to the bottom of the tub. Access may require removing the top or front panel of the washer.

•How do I check for a siphon issue with the drain hose?

Ensure the drain hose is properly installed and is not pushed too far down the drain pipe. The drain hose should have an air gap to prevent siphoning. The top of the drain hose should be higher than the water level in the washer tub.

Roper Washer Error Code LF: Long Fill Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

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

•Where is the pressure switch located on my Roper washer?

•How do I check for a siphon issue with the drain hose?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: