Repair of a Midea wall-mounted heat pump in Sainte-Catherine

A precise and efficient service call signed AirGreen

At AirGreen , we operate daily throughout Greater Montreal to diagnose and repair residential HVAC systems quickly, thoroughly, and transparently. This time, our team was dispatched to Sainte-Catherine , on Montreal's South Shore , for a complete repair of a Midea wall-mounted heat pump installed on the side wall of a red brick duplex.

The customer contacted us after noticing that his heat pump was no longer starting correctly: no compressor noise, and a flashing light on the indoor unit indicated a communication error .

Diagnosis: an electrical fault of external origin

Upon arriving on site, our technicians conducted a complete inspection of the system, starting with the exterior electrical connections . The first observation concerned the Midea compressor connection near the Hydro-Québec meter .

The installation included several important elements:

• A Midea wall-mounted compressor mounted on a sturdy metal bracket;

• A rigid electrical conduit connected directly to the main panel;

• Aging insulation on the power line;

• Signs of light corrosion on the pipe exposed to cold and humidity.

Current clamp analysis revealed no voltage supply at the disconnect switch , indicating an upstream power interruption . Upon inspection, we found that an outside line circuit breaker had tripped due to water ingress into a non-watertight junction box.

Intervention: compliance and lasting protection

Our certified technicians carried out a complete overhaul of the compressor supply line :

1. Replacement of the exterior electrical conduit with a galvanized steel model that is more resistant to humidity.

2. Added a waterproof disconnect box with sealed cover to protect wiring.

3. Reset the circuit breaker and test the entire circuit .

4. Cleaning and restarting the Midea compressor , followed by a full cycle test.

Once power was restored, the compressor restarted immediately. Pressure and temperature measurements confirmed nominal system performance :

• Stable suction pressure at 125 psi;

• Discharge pressure at 375 psi;

• Indoor/outdoor temperature difference of 12°C, in line with Midea specifications.

Result: comfort restored and installation better protected

The customer was back to optimal comfort within minutes. The indoor unit was once again delivering a steady stream of warm air, without any vibration or error flashing.

We concluded the work by applying an anti-corrosion coating to the exposed metal ducts and advising the owner to have all exterior wiring inspected each spring , before the air conditioning season.

Thanks to this targeted corrective maintenance , the customer's Midea heat pump is now protected against water infiltration and untimely activation.

Why choose AirGreen for your HVAC repairs in Sainte-Catherine and throughout the South Shore

At AirGreen , every service call is treated as a project in its own right. Our technicians:

• Diagnose the source of the problem accurately;

• Repair in accordance with the manufacturer's electrical and mechanical standards;

• Offer lasting preventive solutions;

• Use exclusively genuine parts for all authorized brands, including Midea, Fujitsu, Gree, Sharp, Goodman, Trane, and Zephyr .

Our commitment: to provide our customers in Sainte-Catherine, Longueuil, Brossard, and throughout the South Shore , with fast, reliable service that meets the strictest standards in the HVAC field.

In summary

• Unit Type : Midea Wall-Mounted Heat Pump

• Location : Sainte-Catherine (South Shore of Montreal)

• Problem : Power failure — power outage

• Solution : Replace the conduit, waterproof protection, restore the circuit

• Result : Complete reboot, optimal performance, increased security

At AirGreen , we believe that a repair done well is one that doesn't need to be redone.