Repair of a Daikin wall-mounted heat pump in Sainte-Dorothée

Accurate diagnosis and rapid intervention to restore the comfort of a Laval residence

At AirGreen , we were recently called to work on a Daikin wall-mounted heat pump installed on the rear facade of a house in Sainte-Dorothée , in western Laval . The customer had noticed that their system was no longer providing adequate heat despite the outdoor unit apparently operating normally.

After an initial telephone contact, our qualified technician visited the site to perform a complete diagnosis of the HVAC system , taking into account the age of the machine and its exposure to the outside elements.

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Installation context

The Daikin model in question, a wall-mounted inverter compressor heat pump , had been installed a few years earlier. It was mounted on a wall bracket, about 50 cm off the ground, against a red brick wall. The outdoor unit, located near a dense hedge, lacked space for proper ventilation—an often overlooked but crucial detail for a heat pump's performance.

This proximity to dense vegetation caused a restriction of airflow , leading to heat buildup and reduced compressor efficiency , especially in heating mode.

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Diagnosis and causes of the problem

Our technician undertook a series of checks:

• Visual inspection : accumulation of debris and plant resin on the fins of the outdoor evaporator.

• Pressure and temperature test : signs of partially obstructed heat exchange.

• Electrical analysis : normal operation of relays and electronic card.

• Indoor air flow measurement : insufficient flow due to partial filter clogging and slight fan obstruction.

The conclusion of the diagnosis: the unit was functioning correctly mechanically and electronically , but its thermal efficiency was compromised by a lack of maintenance and obstructed ventilation .

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Steps of repair

1. Complete cleaning of the outdoor condenser
   Use a biodegradable cleaning product to dissolve dust and sticky deposits. Rinse at low pressure to avoid deformation of the fins.

2. Pruning the hedge
   In consultation with the customer, we cleared the space around the unit to ensure enough clearance on the sides and in front for proper airflow.

3. Cleaning the interior module

   • Removing and cleaning air filters.

   • Disinfection of the exchanger using an antibacterial treatment.

   • Checking the tangential fan to ensure optimal airflow.

4. Checking refrigeration and electrical connections
   No signs of leakage or abnormal voltage. Connections have been tightened and re-insulated to extend the system's durability.

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Result after intervention

After restarting, performance measurements showed a 25% improvement in heating efficiency and perfect stability of the inverter cycle . The customer immediately noticed a warmer and more powerful blowing inside.

We also advised the owner to perform annual preventative maintenance at the end of each fall to avoid the accumulation of debris and ensure optimal performance during Laval winters.

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AirGreen Maintenance Tips

For owners of wall-mounted heat pumps in similar environments:

• Avoid any obstructions around the outdoor unit (shrubs, fences, objects).

• Clean the internal filters every 4 to 6 weeks during periods of heavy use.

• Schedule an annual professional maintenance , including refrigerant check, pressure test and complete cleaning.

• Watch for warning signs : abnormal noises, excessive frost, decreased airflow, or unusual odors.

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AirGreen Expertise in Laval and Greater Montreal

This intervention illustrates our commitment to providing rigorous and personalized HVAC service in Laval, Montreal, Longueuil, the North Shore and the South Shore.
At AirGreen, every service call is an opportunity to restore our customers' comfort and confidence through our technical expertise and attention to detail .

Whether for repair or preventive maintenance of your Daikin wall-mounted heat pump, our qualified technicians intervene quickly to ensure the best energy efficiency and extend the life of your HVAC equipment .

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Summary of the intervention

• Device type: Daikin wall-mounted heat pump

• Location: Sainte-Dorothée, Laval

• Problem: Poor heating performance

• Cause: Blocked exterior ventilation and clogged filters

• Solution: Complete cleaning, unit clearance, preventive maintenance

• Result: Restored performance, optimal thermal comfort

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AirGreen: your reference for HVAC repairs in Laval

Each AirGreen intervention is based on three pillars: technical expertise, transparency and customer satisfaction .
Regardless of the brand (Daikin, Fujitsu, Gree, Sharp, Midea, Trane, Goodman, etc.), our qualified team diagnoses and solves problems with rigour, in Laval, Montreal and on both shores .