Third Top-Up in a Year: The Pipe Run Settled It

A third top-up in a year, with each leak individually a small repair. When the pattern matters more than any one of them.

By Team Snowflake | Updated 24 Aug 2026

Teaching case based on recurring Snowflake service patterns; identifying details are combined.

How this presents

Repeated refrigerant loss on an original installation, with leaks found at more than one place along the pipework rather than concentrated in one. Each has been repaired successfully. A further loss has now appeared elsewhere on the same run.

Setup: LG Multi-split13-15 yearsHDBPasir Ris
Misread as: Being told the pipework needs replacing when each leak, taken alone, is a small repair.
Check first: How many separate points along the same run have leaked

What else produces this

One leak locates a fault. Several at separate points locate a condition. Where corrosion has worked along a length of pipe, the wall thins everywhere the conditions are the same, and leaks appear wherever it thins fastest first. Counting how many distinct points have failed is what turns a series of repairs into a single decision about the run, and that count is usually available without any further testing.

Leaks at separate points along the run describe a condition spread through the pipework rather than a fault at one place.
Each repair holding successfully afterwards shows the work was sound and that the metal around it is not.
Corrosion visible along the exposed length confirms the wall is thinning generally.
A further loss appearing elsewhere on the same run establishes the pattern beyond doubt.

Why it happens

Copper exposed to the same conditions along its length loses wall thickness at broadly the same rate. Leaks appear one at a time because the thinning is uneven, not because the problem is local. Each repair restores one point and leaves every other part of the run exactly where it was, so the sequence continues at intervals that shorten as the metal grows thinner.

What resolution involves

The pipework is replaced as a run, and the new pipe insulated and protected against the conditions that took the last one. On an installation of this age the decision usually widens. Replacing pipework means opening the system, so it is worth asking what else sits at the same point in its life. That is a genuine comparison rather than an upsell, and it should be made against numbers.

How to tell it worked

How many separate points have leaked, counted deliberately rather than remembered. Three on one run is a different decision from three across an entire property.

Before you approve a quote

Several leaks on one run is one decision

One leak is a fault. Several at separate points on the same run is a condition along its length.
Repairs that hold well and are followed by new leaks elsewhere point at the metal, not the work.
Count the distinct failure points. That number is what turns a sequence of repairs into one decision.

Questions this case answers

Why does aircon gas keep running out after every top up?

Because the corrosion affects the whole length rather than one spot. Repairing a point restores it and leaves every other part of the run exactly as thin as it was, so the next leak follows at another weak point.

What test should be done before agreeing to another gas top up?

A leak test covering the whole run rather than the last known point, because the corrosion is spread along the pipe. Counting how many separate points have already leaked is usually enough to show the pattern, and each further repair buys less time than the one before.

Can a leaking aircon pipe be patched instead of replaced?

Once leaks have appeared at several separate points on the same run, patching leaves the rest of the thinned pipe exactly as it was, so the run should be replaced as a length. A single leak on otherwise sound copper is a different question.

Does living near the sea affect aircon pipework?

Yes, where the run is exposed to the same damp conditions along its length. Here the corrosion had thinned the copper until it leaked at several separate points, and that pattern called for replacing the run rather than patching it again.

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