Repair of a Goodman wall-mounted air conditioner in Anjou (Montreal)

A Goodman wall-mounted air conditioner that was no longer blowing cold air.

At AirGreen , we recently repaired a Goodman wall-mounted air conditioner in an apartment in Montreal's Anjou district. The customer contacted us during the spring heatwave: their unit was working, but the outgoing air remained lukewarm , despite an active outdoor compressor. A typical situation where an accurate diagnosis makes all the difference.

Diagnosis: No refrigerant and faulty temperature sensor

Our technician visited the site for a complete inspection of the Goodman wall-mounted system , a compact 12,000 BTU model. After a series of tests, here is what was found:

• The indoor fan was operating normally, without obstruction;

• The external compressor started fine, but the pressures were too low;

• A faulty temperature sensor (thermistor) prevented precise control of the cooling cycle;

• Traces of oil on the refrigerant line , a sign of a micro-leak at the flare connection.

These elements explained why the unit produced air at room temperature without ever reaching the optimal cooling mode.

Repair: leak detection and complete system recharge

The intervention involved several technical stages:

1. Nitrogen leak test to locate micro-leak on copper pipe fitting.

2. Flare replacement and torque tightening to Goodman standards.

3. Complete draining of the circuit to eliminate all moisture.

4. Recharge with R410A refrigerant according to the exact quantity prescribed by the manufacturer.

5. Replacement of the interior temperature sensor and electronic recalibration via the control module.

6. Cleaning the filters and evaporator , which had a slight accumulation of dust.

Once the repairs were completed, a performance test confirmed a temperature difference of 9.5°C between the air inlet and outlet—a sign of optimal performance.

Result: restored performance and satisfied customer

The customer immediately noticed an improvement in indoor comfort , with a stable temperature and a noticeable reduction in operating noise. The Goodman wall system regained its full cooling capacity, while maintaining efficient energy consumption .

At AirGreen, we always emphasize the importance of a thorough diagnosis before refilling the gas tank. Even a small leak can shorten the compressor's lifespan and unnecessarily increase your electricity bill.

Why Preventive Maintenance is Essential

A Goodman heat pump or wall-mounted air conditioner is designed to last more than 10 years, but its efficiency depends on rigorous maintenance:

• Regular cleaning of filters every 4 weeks during periods of use;

• Check pressures and connections once a year;

• Defrosting the outdoor condenser at the end of winter if the system is dual-mode (heating/cooling);

• Inspection of electronic sensors and calibration as needed.

These simple actions help prevent costly breakdowns and ensure constant comfort throughout the year.

AirGreen: Your Goodman Wall Systems Expert in Montreal

Our technicians are RBQ certified and CCQ qualified , specializing in the repair and maintenance of Goodman, Gree, Fujitsu, Midea and Lennox systems . We operate throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore .

Each service call is handled with rigor:

• On-site diagnosis with certified electronic tools;

• Exclusive use of genuine Goodman parts ;

• Guarantee on all our repairs;

• Personalized advice to improve the efficiency and sustainability of your installation.

An AirGreen repair: reliability, transparency and expertise

This intervention in Anjou perfectly illustrates our commitment: to quickly restore our customers' comfort while optimizing the energy performance of their equipment. At AirGreen, we believe that a well-maintained system is a lasting investment for your home.