How a Minor Refrigerant Leak Was Costing a Sydney Pub More Than They Realised

Not every commercial refrigeration problem announces itself with a full system failure. Some of the most disruptive and costly issues are the quiet ones — small, persistent faults that drain money gradually and go undetected for months. This is the story of a recurring refrigerant leak in a basement cake room at a city pub, and how a precise diagnosis put an end to a frustrating and expensive cycle of gas top-ups.

The Setup: A Compact Cake Room With a Specific Job

The system in question was a compact refrigerated cake room located in the basement of a Sydney CBD pub. The space was purpose-built for a single function — keeping cakes at a stable, cool temperature to maintain freshness and minimise waste.

The setup used an evaporator at the back of the room connected to a glycol tank, with an additional cabin unit positioned outside the cake room. The temperature range required was narrow. The system did not need to do anything complex — it simply needed to hold a consistent temperature reliably and efficiently.

The problem was that it kept losing refrigerant. The client had been managing the issue through repeated gas top-ups, which had become a recurring and unnecessary expense with no permanent resolution in sight.

The Diagnosis: Ruling Out the Obvious Before Finding the Real Cause

On inspection, the system did not present any obvious signs of failure. There were no visible cracks, no dramatic faults, and no failed major components. A methodical approach was required to identify what was actually causing the steady gas loss.

Several components were assessed in sequence:

The TX valve — a common source of refrigeration faults, but not the issue here
Compression fittings and connections — inspected thoroughly and found to be structurally sound
The adjustment screw and sealing components — this is where the fault was identified

The root cause was thermal cycling. Over time, the natural expansion and contraction of metal components — moving repeatedly between warm and cold conditions — places ongoing stress on seals, fittings, and brass connections. Eventually, that accumulated fatigue causes internal seals to give way. In this case, the adjustment sealing cap had deteriorated and was producing a small but continuous refrigerant leak.

A secondary access valve, used to connect gauges during servicing, was also contributing to the loss. Individually, neither issue would have seemed significant. Together, they were responsible for a persistent gas leak that had been running quietly for an extended period.

The Repair: Precise, Targeted, and Effective

The fix did not require a major overhaul. It required accurate diagnosis followed by targeted repair — which is exactly what the situation called for.

The work completed included:

Replacing the deteriorated adjustment sealing cap
Addressing the micro-leak at the access valve fitting
Re-securing all affected fittings to prevent recurrence

The repair was straightforward once the source of the problem was correctly identified. That identification was the critical part of the job.

The Result: No More Gas Top-Ups, No More Unnecessary Expense

With the leaks resolved and the system properly sealed, the refrigeration unit returned to stable, efficient operation. The client no longer needs recurring gas top-ups, the ongoing cost has been eliminated, and the cake room is maintaining the consistent temperature it was designed to hold.

A small leak, fixed properly, made a meaningful difference to the running costs and reliability of this client’s operation.

What This Job Demonstrates About Commercial Refrigeration Faults

If your refrigeration system requires more frequent gas top-ups than it used to, or if your energy costs have been creeping upward without explanation, these are signs worth investigating. Regular servicing allows technicians to identify deteriorating seals and fittings before they become a persistent and costly problem.

Commercial Refrigeration Diagnosis and Repair Across Sydney CBD

BM Refrigeration services commercial refrigeration systems across Sydney CBD and surrounding areas, including pubs, restaurants, cafes, and specialty food businesses. Whether you are dealing with a recurring fault or want to put a preventative maintenance plan in place, we are ready to help.

Contact BM Refrigeration today to book a diagnostic assessment or discuss ongoing servicing for your business.