Two Bedrooms Losing Cooling Together: Pinhole Coil Leak

Two bedrooms that stopped cooling within the same few weeks, while the living area and the remaining room are entirely unaffected. Both bedrooms sit adjacent to one another. Each indoor unit is clean and running normally.

Two rooms failing together and two rooms unaffected is a much stronger signal than either fact alone. A shared fault at the outdoor unit would have taken all four, and two separate faults arriving in the same weeks is unlikely enough to set aside. So the search is for something serving exactly those two, which means following the pipework from the outdoor unit and finding where it divides. The point where the branch to those two rooms separates is the candidate.

Refrigerant leaving a shared outdoor unit is divided among the indoor units through distributor joints, and those joints sit part-way along the run. A failure at one of them starves every room downstream of it and leaves everything upstream untouched. The pattern of affected rooms is therefore a direct read of the pipework layout, whether or not anyone has the original drawings.

Repairing the distributor joint and recharging the system restores both rooms at once. The transferable part is the reading rather than the repair. Before opening anything, list which rooms are affected and which are not, then find the point in the pipework that serves exactly that set. On a multi-room system, that single step removes most of the search before it begins.