LG LFX28978ST: Freezer Stopped Cooling, Fresh Food at 73°F in Houston, TX
📞 Call (346) 512-3688🔧 Performed by Serhii T.
The Problem
- •Freezer completely stopped cooling while the fresh food section still ran
- •Both the freezer and fresh food compartment measured above 73°F by the time I arrived
- •Refrigerator had been running for 14 years without any compressor service or refrigerant work
🔍 Diagnosis
When I arrived at the 77073 address the next morning, I found a 14-year-old LG LFX28978ST/02 made in Korea. The customer had already moved her food to a second refrigerator, so there was no urgency around food loss. Both compartments read above 73°F on my digital probe thermometer. The unit was still powered and attempting to run. I connected my manifold gauges to the sealed system. What I pay close attention to at this stage is how the system equalizes. On a clean, leak-free sealed system, the pressures balance out smoothly and predictably. On this LG, the equalization behavior confirmed the sealed system itself was in good condition, with no leaks and no contamination. That pointed the diagnosis directly at the compressor. LG linear compressors on this generation of French door models are a known failure point. The linear compressor uses a piston driven by electromagnetic coils rather than a rotary mechanism, and after 10 to 14 years the coil windings or piston assembly degrade to the point where the compressor loses its ability to build pressure. I confirmed compressor failure through gauge readings and electrical checks. Despite the compressor failure, the sealed system was notably clean, which made this a straightforward overhaul rather than a complicated contamination case.
🔧 The Repair
- ✓Step 1: Connected manifold gauges to the LFX28978ST/02 sealed system and observed equalization behavior. Confirmed clean system with no refrigerant contamination or pressure anomalies beyond compressor failure.
- ✓Step 2: Recovered the R-134a refrigerant charge from the sealed system per EPA 608 protocol before opening the system.
- ✓Step 3: Disconnected and removed the failed LG linear compressor. Inspected the compressor cavity and refrigerant lines for oil residue or debris. Found the lines clean.
- ✓Step 4: Installed the replacement LG linear compressor. Brazed all refrigerant line connections using nitrogen-purged brazing to prevent oxidation scale inside the copper tubing.
- ✓Step 5: Replaced the filter drier with a new OEM-spec unit. Any time the sealed system is opened, the drier gets replaced regardless of system condition. The old drier absorbs moisture during the open period and cannot be reused.
- ✓Step 6: Pressure-tested the reassembled sealed system with dry nitrogen. Held pressure to confirm all brazed joints were leak-free before pulling vacuum.
- ✓Step 7: Evacuated the sealed system to a deep vacuum using a two-stage vacuum pump. Held vacuum to confirm system integrity.
- ✓Step 8: Recharged the sealed system with fresh R-134a to the label specification of 4.94 oz. Powered the unit on. The compressor started immediately and both compartments began dropping in temperature. Verified the system was cooling on both circuits within the first 30 minutes. Target temperatures of 0°F in the freezer and 37°F in the fresh food section were expected to be reached within 24 hours of runtime.
✓ Result
The LFX28978ST/02 started cooling immediately after the recharge. I told the customer to expect both zones to reach their set points within 24 hours: 0°F for the freezer and 37°F for the fresh food section. For a 14-year-old LG that had never had compressor work done, this unit was in genuinely good shape internally. The sealed system was clean, the lines were clear, and the new linear compressor went in without complications. The customer was relieved. She said she had been on the fence about replacing the refrigerator entirely, and now she has a compressor that should give her another decade of service.
💡 Technician Notes
LG linear compressors in French door models from this era, roughly 2008 to 2014, tend to fail between years 10 and 15. The early sign specific to this failure is that the freezer loses cooling first while the fresh food section appears to keep working for a short time. That happens because the fresh food section draws cooled air from the freezer, and as the freezer warms, the fresh food section eventually follows. If you notice your LG freezer running warmer than usual but the fresh food section still feels cool, do not wait. That gap closes fast. One maintenance action that matters for these units is keeping the condenser coils clean. A compressor working harder against dirty coils has a shorter lifespan. On a 14-year-old LG, if the compressor fails and the sealed system is otherwise clean, repair is almost always the right call over replacement. A contaminated system is a different conversation.
Frequently Asked Questions
Why did my LG French door refrigerator freezer stop cooling but the fresh food section still works?
On LG French door models like the LFX28978ST, the fresh food section is cooled by air circulated from the freezer. When the linear compressor starts failing, the freezer loses cooling first. The fresh food section feels okay for a short time because it still holds some residual cold air. Once the freezer warms fully, both sections climb together. This pattern almost always points to compressor failure in LG units of this generation.
How much does it cost to replace a linear compressor on an LG refrigerator in Houston?
A linear compressor replacement on an LG French door model in Houston typically runs between $600 and $900 for parts and labor combined, depending on the specific model and sealed system condition. If the sealed system is clean and requires only a standard drier swap and recharge alongside the compressor, the job stays toward the lower end of that range. Factor in 24 to 48 hours for the refrigerator to reach full operating temperature after the repair.
What happens if I delay repairing my LG refrigerator when the freezer stops cooling?
If you delay repair on an LG like the LFX28978ST once the freezer stops cooling, the fresh food section will also warm to room temperature within hours. Any food left inside will be lost. Beyond the food, running a refrigerator with a failed compressor puts strain on the control board and other electrical components that continue cycling. Getting the repair done quickly avoids turning a single compressor replacement into a more expensive multi-component repair.
Is it worth repairing a 14-year-old LG refrigerator with a failed compressor?
In most cases, yes, if the sealed system is clean. A clean sealed system means the repair is limited to the compressor, drier, and refrigerant charge. The LFX28978ST/02 is a well-built unit, and LG made these in Korea with quality internals that hold up. A new linear compressor in a clean system gives realistic expectations of another 8 to 12 years. If the sealed system shows contamination or multiple components have failed, replacement becomes the better financial decision.
What does it mean that the LG sealed system was clean, and why does that matter for the repair?
A clean sealed system means the refrigerant lines contain no moisture, acid, or compressor debris. When a compressor fails catastrophically, it sometimes sends metal particles and oil sludge through the lines, which contaminates the evaporator and condenser. On this LFX28978ST, the system equalized smoothly on the gauges, confirming no contamination. A clean system means the new compressor, drier, and fresh R-134a charge go into an environment that won't shorten the replacement compressor's lifespan.
Repair Summary
- Brand
- LG
- Model
- LFX28978ST/02
- Repair Type
- Linear Compressor Replacement and Sealed System Overhaul
- Refrigerant
- R-134a
- Root Cause
- Failed linear compressor after 14 years of continuous operation
- Parts Replaced
- ✓LG linear compressor (direct replacement for LFX28978ST/02, Korean-manufactured unit)
- ✓Filter drier (replaced as standard protocol on any sealed system opening)
- ✓R-134a refrigerant, 4.94 oz per label specification (fresh charge)
- Location
- Houston, TX 77073
- Status
- ✓ Completed
Service Area
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LG LFX28978ST/02 repair in Houston, TX — photo 3
LG LFX28978ST/02 repair in Houston, TX — photo 4
LG LFX28978ST/02 repair in Houston, TX — photo 5
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