Two bedrooms losing cooling traced to indoor coil leak
Aircon case in Sembawang, Singapore: cooling loss traced to pin-hole leak at indoor coil return bend on one fan coil after targeted diagnosis checks.
Case details
What client reported
Two bedrooms would cool for a period after top-up, then both became warm again. The living room remained better than the bedrooms.
What we found
We prioritized leak tracing around shared paths serving the weaker rooms before suggesting broad replacement.
- Operating pressure dropped below expected range
- Shared bedroom branch showed the earliest cooling decline
- General flare checks were negative
- Localized leak evidence appeared at one indoor coil return bend
A pin-hole leak developed at an indoor coil return bend. Refrigerant escaped gradually, causing repeated loss of cooling performance in the linked bedrooms.
What we did
We advised targeted coil-side repair path options based on the confirmed leak point and system condition, instead of repeated top-ups.
After leak-path correction, cooling stability improved and the repeat top-up cycle was no longer needed.
Timeline
Day 1
Two bedrooms repeatedly lost cooling after top-ups
Day 2
Combined pressure hold with targeted dye and bubble tracing around coil return bends
Day 2
Leak source identified at indoor coil bend
What we learned
Why linked room decline points to a shared refrigerant path.
- When two rooms decline together, the root cause is often upstream of both zones.
- Local leak tracing around coil bends can reveal faults missed by general checks.
- Confirming the leak location turns repeated top-ups into one targeted repair path.
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