Quoted for Full System Replacement: Only Outdoor Unit Needed
Aircon case in Tampines, Singapore: cooling loss traced to refrigerant leak isolated to corroded outdoor unit pipe connections — indoor units unaffected after targeted diagnosis checks.
Case Details
| Unit | LGWall-mounted |
|---|---|
| Age | 6 years old |
| Location | CondoTampines, Singapore |
| Reported | The unit had been losing cooling over the past few weeks. Another company had assessed and quoted full system replacement — indoor and outdoor. A second opinion was requested before committing to that scope. |
What We Checked
- Refrigerant pressure was low, confirming active gas loss.
- Indoor flare joints on all units showed no signs of leakage.
- Indoor fan coils, filters, and drain pans were in good working condition for their age.
- Outdoor unit pipe connections showed corrosion and green oxidation.
- Bubble test confirmed active leak at the outdoor unit gas line connection.
The Diagnosis
The gas leak was confined to the corroded pipe connections at the outdoor unit. Moisture exposure over the years had weakened the joint seals at the connection points. The indoor units were not contributing to the refrigerant loss. Their flare joints were intact and the fan coils showed normal wear for a unit of this age. The previous contractor had quoted full replacement without isolating the leak location.
What Fixed It
We confirmed the indoor units did not need replacement. The leak was isolated to the outdoor unit connections. We recommended replacing the outdoor unit with a compatible LG model while retaining the existing indoor units. This addressed the corroded connections without unnecessary cost. Outdoor-only replacement was approved, and we verified compatibility between the new outdoor unit and existing indoor units before proceeding.
The outdoor unit was replaced, existing indoor units reconnected, and the system pressure-tested and charged to specification. Cooling returned to normal across all rooms with no further gas loss.
Why This Happens
When outdoor-only replacement makes sense for gas leaks.
- If the leak is confined to the outdoor unit connections, check the indoor units separately. When they are in good condition, replacing only the outdoor unit is a valid and cost-effective option.
- Compatibility between the new outdoor unit and existing indoor units must be verified before proceeding.
- Full system replacement is not always necessary — the decision depends on where the leak is and the condition of each component.
- Getting a second opinion before committing to a full replacement can save significant cost when the fault is localised.
Related Reading
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