Does a weather shield fully prevent outdoor unit corrosion?

It reduces the rate of corrosion by limiting direct rain and wind exposure, but does not eliminate it. Humidity and airborne moisture still contribute over time. It extends the timeline, which makes it worthwhile.

Are high-floor units more likely to develop gas leaks?

Units on exposed high floors are at higher risk because wind drives moisture into connection areas more aggressively. The risk depends on the specific mounting position and how shielded the unit is.

Should I check my outdoor unit connections regularly if I live on a high floor?

Yes, an annual visual check for corrosion or green oxidation at the pipe connections is a good practice. Catching corrosion early gives you more repair options before it spreads.

LG Outdoor Unit Gas Leak From High-Floor Wind and Rain Exposure

Aircon case in Punggol, Singapore: cooling loss traced to accelerated corrosion at outdoor unit connections due to high-floor wind and rain exposure after targeted diagnosis checks.

Case Details

Reported: The aircon is not cooling well. It is only four years old so I did not expect any major issues. My previous technician topped up the gas, but cooling started dropping again. The outdoor unit is on my balcony.
Unit: LG · Wall-mounted · 4 years old
Location: Condo · Punggol, Singapore

What We Checked

Refrigerant pressure was below normal operating range despite recent top-up.
Outdoor unit was mounted on an open high-floor balcony with no overhead cover.
Pipe connections showed corrosion and oxidation more advanced than expected for a four-year-old unit.
Bubble test confirmed active leak at the gas line connection on the outdoor unit.
Indoor unit flare joints showed no signs of leakage.

The Diagnosis

The outdoor unit was fully exposed to wind-driven rain on a high-floor balcony. Without any overhead cover or barrier, moisture collected around the pipe connections more frequently and in greater volume than a sheltered installation. This accelerated corrosion at the connection joints. At four years old, the corrosion was already at a stage typically seen on units aged six to eight years in more protected positions. The LG error code CH35 flagged low-pressure protection, consistent with refrigerant loss.

What Fixed It

We welded the leaking connection and recharged the system. Because the corrosion was caught relatively early and had not spread across a wide area, a weld repair was viable. We also recommended installing a weather shield over the outdoor unit to reduce future moisture exposure. The homeowner agreed to both the repair and the shield. We noted that the connections should be inspected annually given the exposure level, and that the weld may need monitoring over the coming years.

The leak was welded and the system recharged. A weather shield was installed over the outdoor unit to reduce direct rain exposure. Cooling has been stable since, with a follow-up inspection scheduled.

Why This Happens

Why high-floor outdoor units corrode faster.

Outdoor units on upper floors face stronger wind speeds and more direct rain exposure than sheltered ground-level or ledge installations.
Wind drives moisture into connection areas that would normally stay relatively dry in a sheltered position.
Corrosion timelines shorten significantly when the unit has no overhead cover or wind barrier.
A weather shield or cover over the outdoor unit can slow corrosion, though it does not eliminate it entirely.

Same situation with your aircon?

Describe what’s happening. We’ll work out the likely cause and tell you the right next step.

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