LG Refrigerator Model LFXS28968S: Linear Compressor... | appliancefaults.com

Technical Background:

The LG LFXS28968S uses a linear compressor controlled by the main control board (MCU). The MCU regulates the compressor speed based on temperature sensors in the refrigerator and freezer compartments. Voltage is supplied to the compressor via a relay. Abnormal compressor operation can result in unusual sounds.

Symptoms:

The homeowner reports a rattling noise originating from the rear of the refrigerator, near the compressor. The noise is intermittent and may be louder during certain cycles. The refrigerator is still cooling, but the homeowner is concerned about potential compressor failure.

Possible Causes:

Compressor mounting bolts loose.
Internal compressor damage.
Refrigerant line vibration.
Defective compressor relay.
Incorrect compressor voltage.
Main control board failure.

Solution:

1

Unplug the refrigerator and ensure it is de-energized. Verify 0V AC at the wall outlet.
2

Locate the compressor at the rear of the refrigerator.
3

Inspect the compressor mounting bolts for tightness. Tighten any loose bolts using a 1/2-inch socket.
4

Check the compressor relay/overload. Use a multimeter to test for continuity. Replace if faulty.
5

Verify proper voltage at the compressor. Should be 120V AC. Use a multimeter to test.
6

Inspect refrigerant lines for contact with the refrigerator cabinet. Gently bend lines away from contact points.
7

If the rattle persists, the compressor may be internally damaged and require replacement. This requires refrigerant recovery and recharge by a certified technician.

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. Use proper lockout/tagout (LOTO) procedures to prevent accidental energization. High voltage is present at the compressor and control board. Exercise caution.

Prevention:

Regularly clean the condenser coils located at the bottom or rear of the refrigerator. This improves airflow and reduces compressor workload. Check the compressor mounting bolts annually for tightness.

Expert Tip:

Try entering the service mode by pressing and holding the Freezer and Refrigerator buttons simultaneously for 5 seconds. This may initiate a compressor test cycle that can help isolate the source of the noise.

Frequently Asked Questions

•What is the proper resistance reading for the compressor relay?

The compressor relay should have low resistance (near 0 ohms) when tested for continuity. Infinite resistance indicates an open relay.

•How do I properly discharge the start capacitor before working on the compressor?

Use a 20,000-ohm 2-watt resistor to slowly discharge the capacitor. Connect the resistor leads to the capacitor terminals for several seconds. Verify with a multimeter that the voltage is near 0V before touching the terminals.

•What type of refrigerant is used in the LFXS28968S and what are the proper charging procedures?

The LFXS28968S typically uses R-134a refrigerant. Charging requires a certified technician with EPA Section 608 certification. Refer to the unit's service manual for specific charging procedures and pressures.

LG Refrigerator Model LFXS28968S: Linear Compressor Rattle Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance reading for the compressor relay?

•How do I properly discharge the start capacitor before working on the compressor?

•What type of refrigerant is used in the LFXS28968S and what are the proper charging procedures?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: