LG LMXS28626S Refrigerator: Loud Jackhammer Noise When... | appliancefaults.com

Technical Background:

The water dispenser system on the LG LMXS28626S uses a water inlet valve controlled by the main control unit (MCU). When the dispenser paddle is pressed, the MCU sends a 120V AC signal to the valve solenoid, opening the valve and allowing water to flow. A malfunction in the valve, excessive pressure, or trapped air can cause the noise.

Symptoms:

The LG LMXS28626S refrigerator makes a loud, repetitive jackhammer-like noise whenever the water dispenser is activated to fill a glass.

Possible Causes:

Defective water inlet valve: The solenoid may be malfunctioning, causing rapid opening and closing.
High water pressure: Excessive pressure can cause the valve to vibrate.
Loose plumbing connections: Vibration in the lines can amplify the noise.
Air trapped in the water line: Air bubbles can cause sputtering and noise as they pass through the valve.
Restricted or clogged water filter: Can cause strain on the system, leading to valve noise.
Icemaker fill valve malfunctioning while dispenser is running.

Solution:

1

Disconnect power to the refrigerator at the breaker panel.
2

Turn off the water supply to the refrigerator at the shut-off valve.
3

Using a 1/4-inch nut driver, remove the back panel of the refrigerator to access the water inlet valve.
4

Disconnect the water lines from the water inlet valve and inspect for mineral buildup or obstructions.
5

Disconnect the electrical connector from the water inlet valve and using a multimeter, check for 120V AC when the dispenser paddle is activated.
6

Replace the water inlet valve with a new, OEM LG valve.
7

Reconnect the water lines and electrical connector, and turn the water and power back on. Test the dispenser.

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. Lock out/Tag out (LOTO) the breaker to prevent accidental re-energizing. High voltage components are present; use caution.

Prevention:

Replace the water filter every 6 months with an LG LT1000P filter. Check water pressure annually and ensure it's within the recommended range (30-100 PSI).

Expert Tip:

Run the refrigerator in test mode by holding the freezer and refrigerator temperature buttons simultaneously for 5 seconds. This will cycle the water valve, allowing you to further diagnose the issue.

Frequently Asked Questions

•How do I check the water pressure to my refrigerator?

You can use a water pressure gauge that attaches to the water line fitting. Most hardware stores sell these gauges. Simply attach it to the fitting after shutting off the water supply and releasing any pressure in the line.

•What is the correct replacement part number for the water inlet valve?

The correct replacement part number for the water inlet valve on the LG LMXS28626S is likely the original part number specified by LG, which can be found on the valve itself or in the refrigerator's parts diagram. A common replacement number is 5221JA1064A but you should confirm compatibility with your model.

•How do I bleed the air from the water line after replacing the filter?

After replacing the filter, dispense water for 5-10 minutes continuously to purge any air from the line. You may hear sputtering initially as the air escapes. Continue until the water flows smoothly.

LG LMXS28626S Refrigerator: Loud Jackhammer Noise When Filling Water

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I check the water pressure to my refrigerator?

•What is the correct replacement part number for the water inlet valve?

•How do I bleed the air from the water line after replacing the filter?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: