Aircon Gas Leak Detection in Singapore
Low refrigerant is a symptom, not the fault. Topping up without finding the leak means paying again in months. We pressure-test first to confirm whether a leak exists and exactly where it is.
What Is Gas Leak Detection
Nitrogen is injected into the refrigerant circuit at controlled pressure, then held for a set period. If pressure drops, there is a leak. If it holds, the system is sealed and just needs a refrigerant recharge. When a leak is confirmed, we locate the exact point before quoting the repair.
Common Leak Locations
Leaks occur at specific weak points in the refrigerant circuit.
Flare joints
The most common leak point — where copper pipes connect to the indoor and outdoor units. Undertightened or overtightened flares fail over time.
Service valves
Located on the outdoor unit. Valve cores and caps develop slow leaks, especially on older systems.
Evaporator coil
Corrosion from condensation and cleaning chemicals causes pinhole leaks in the indoor coil. More common on units over 7 years old.
Pipe runs
Physical damage, vibration fatigue, or corrosion along the copper pipe. Often hidden inside trunking or walls.
How We Test
Four steps from isolation to confirmed result.
- 01
System isolation
The refrigerant circuit is isolated and any remaining gas recovered safely before nitrogen is introduced.
- 02
Nitrogen pressurisation
The system is filled with dry nitrogen to a controlled pressure. Nitrogen is inert, safe, and the industry standard for leak testing.
- 03
Pressure hold test
The system is left pressurised for a set period. Pressure drop confirms a leak. Steady pressure means the system is sealed.
- 04
Leak location
If pressure drops, we use soap solution and electronic detectors to pinpoint the exact point — joint, valve, coil, or pipe run — before quoting the repair.
Benefits of Gas Leak Detection
What changes when you test before you top up.
Leak confirmed before you top up
Stops the cycle of paying for gas that escapes again within months.
Exact fault location identified
Flare joint, valve, coil, or pipe run — we find the specific point before quoting the fix.
Repair verified before recharging
After the fix, we pressure-test again to confirm the system holds.
One test prevents repeated top-up charges
Test cost is typically less than two gas refills.
When to Book Gas Leak Detection
Not every gas issue needs a pressure test — but skipping it when one is needed means paying for top-ups that escape again.
Gas dropped noticeably within a few months of a top-up
Likely a leak. Test before refilling.
System completely empty
Something has failed. Find the leak before recharging.
After piping work or unit relocation
Verify all joints are sealed before charging.
New installation commissioning
Standard practice before the first refrigerant charge.
After compressor or valve replacement
New joints must be verified before recharging.
When Gas Leak Detection Is Not the Right Call
Not every cooling or refrigerant symptom points to a leak.
Slight pressure drop over several years
Minor loss over time is normal. A top-up is sufficient, no test needed.
Unit not cooling but pressure reads normal
Refrigerant level is not the issue. Likely an electrical or mechanical fault.
Ice on the indoor unit
Usually a symptom of low gas or restricted airflow, not a standalone reason to pressure-test.
System has been stable after previous top-ups
If the system has held gas for years, a test is not warranted before every refill.
Gas Leak Detection FAQ
Gas Leak Detection Rates
Pressure testing and leak repair quoted on-site based on system size and access. We cover all areas of Singapore, Monday to Saturday. See the full price list for all services.
| Service | 3+3+ units | 22 units | 11 unit |
|---|---|---|---|
| Gas leak repair | |||
| Leak detection & diagnosis | Request quote | ||
| Pressure testing | Request quote | ||
| Joint / flare repair | Request quote | ||
| Pipe section replacement | Request quote | ||
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