Repair of a Goodman wall-mounted heat pump in Chomedey (Laval): complete recommissioning on a wall bracket

In the Chomedey sector of Laval , we serviced a Goodman wall-mounted heat pump (mini-split) installed high on a brick facade, directly under a balcony. This type of installation is common in residential buildings (condos, plexes, co-ownerships): the outdoor unit is mounted on wall brackets to free up floor space, protect the unit from snow accumulation, and keep a yard or parking area clear.

This visit was for a repair (not an installation): the client contacted us because the system was no longer delivering the expected comfort, with performance becoming erratic over the weeks.

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Context: reported symptoms and initial observations

Upon our arrival, the client described typical signs of a problem that is gradually “taking hold”:

• Insufficient cooling in air conditioning mode (interior temperature drops very slowly).

• Short cycles : the unit would start, then stop quickly.

• Noise is more noticeable outside during start-up attempts.

• The heat pump feels like it's "working hard", without a proportional result.

Visually, the installation presented several elements useful for diagnosis:

• Goodman outdoor unit mounted on metal brackets on the wall.

• Electrical disconnect box installed nearby.

• Refrigerant lines running inwards (consistent layout, but exposed to temperature variations and vibrations, which can affect the fittings over time).

• Position under balcony: partial protection, but be careful of clearance and air circulation.

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AirGreen diagnosis: method, measurements and validation

At AirGreen, we don't "guess." A drop in performance on a wall-mounted heat pump can stem from several causes: fouling, ventilation, electronics, sensors, drainage, or even the refrigerant circuit. Our diagnosis therefore followed a logical sequence.

1) Verification of operating parameters

We first confirmed:

• Requested mode (air conditioning/heating) and setpoint.

• Response of the indoor unit (airflow, louver behavior, stability).

• Anomalies were present at startup.

2) Mechanical inspection and ventilation (exterior)

On the outdoor unit:

• General condition check, fixing of supports, vibrations.

• Fan propeller and motor check (no blockage, correct rotation).

• Coil inspection (cleanliness, debris, partial obstruction).

A clogged coil can be enough to cause a drop in performance, but in this particular case, dirt alone did not explain the symptoms.

3) Electrical measurements and protections

We then checked:

• Power supply to the disconnect switch.

• Voltage stability.

• Connections and signs of overheating.

Everything was in order, which led us to a more thorough diagnosis of the refrigeration circuit .

4) Most likely hypothesis: pressure drop / slight leak

The symptoms (gradually decreasing performance, unstable cycles, lack of “cooling power”) are often consistent with an insufficient refrigerant charge , usually caused by a micro-leak (often on flare fitting, especially when the unit is high up and subject to more vibration and expansion).

We therefore carried out confirmation tests.

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Repair: Steps taken on the Goodman wall-mounted heat pump

Step 1 — Locating the leak (rigorous approach)

We inspected the sensitive areas:

• Flare fittings and accessible connections.

• Tracing of connections, friction zones.

• Signs of oil (a common indicator of a slow leak).

After checks, the analysis converged on a fitting with insufficient sealing (typical: slight play, micro-irregularity, or tightening that has changed over time).

Step 2 — Reconnecting the joint: re-flare and adjustment

We dismantled the relevant section, then:

• Resumed the preparation of the tube (clean cut, deburring).

• Created a high-quality flare (uniform geometry).

• Replace the fitting with controlled tightening to avoid:

  • under-tightening (leak),

  • overtightening (flare crack).

Step 3 — Leak test and pressurization

Before putting the system back into service, we carried out the following:

• A leak test (pressure testing procedure).

• Confirmation that there was no further loss at the connection point.

This is an essential step: recharging a system without ensuring it is airtight guarantees the problem will return.

Step 4 — Vacuuming and recharging

Once the seal is confirmed:

• Complete vacuuming with a stable vacuum objective (proof of absence of moisture and residual leaks).

• Recharging according to system parameters and link length (methodical and measured approach).

Step 5 — Performance testing under real-world conditions

After restarting, we confirmed:

• Stability of pressures and temperatures.

• Heat transfer quality (clear improvement in cooling).

• Absence of a short cycle.

• Normalized noise level.

Result: the Goodman heat pump has returned to stable operation, with a noticeable performance recovery almost immediately.

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Installation details observed: what this photo tells us (and what we are monitoring)

This installation, typical of condominiums, has a few key points:

• Outdoor unit on wall brackets : excellent for avoiding snow and clearing space, but it increases the importance of anti-vibration and the quality of the connections.

• Installation at height : makes access more technical (safety, ladder, handling), and can complicate maintenance if periodic inspections are not planned.

• Proximity to a balcony : good clearance must be maintained for the unit to breathe. Reduced air circulation can degrade efficiency and put strain on the compressor.

Our recommendation, after repair, therefore included a simple reminder: an annual check (or every two years depending on usage) limits surprises, especially when the unit is exposed to freeze/thaw cycles and vibrations.

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Results: restored comfort and peace of mind

After the procedure:

• The customer has regained efficient and consistent cooling .

• The system has stopped "straining" unnecessarily, which helps to protect the compressor.

• The cycles have returned to normal, with better temperature stability.

Beyond repair, the objective is always the same: to restore comfort , reduce the risk of recurrence and extend the lifespan of the equipment.

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Why entrust a Goodman repair to AirGreen in Laval?

Because on a wall-mounted heat pump, the quality of a repair depends on:

• the accuracy of the diagnosis (avoiding unnecessary replacements),

• the rigor of the leak tests,

• the recharging procedure,

• and the final validation under real-world conditions.

In Chomedey as elsewhere in Greater Montreal, we intervene with the same approach: methodical, documented, results-oriented .