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Réparation d’une Thermopompe Murale Daikin à Sainte-Dorothée
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Repair of a Daikin wall-mounted heat pump in Sainte-Dorothée

A revealing service call: a heat pump that was no longer heating properly

At AirGreen , we were called by a customer in Sainte-Dorothée (Laval) for an urgent repair of a Daikin wall-mounted heat pump . The customer had been noticing a lack of heating for several days, accompanied by an abnormal noise coming from the outdoor compressor . In this cool mid-season period, the urgency was real: the thermal comfort of the home had to be restored quickly.

Initial inspection: a suffering external compressor

Upon our arrival, our certified technician performed a complete inspection of the Daikin outdoor unit , visible in the photo above.
This model, typical of the Daikin RX series , was mounted on a wall bracket under an eave - a correct installation, but exposed to moisture and accumulated dust.

Visual inspection revealed:

  • A grid clogged with dirt and urban deposits .

  • Slightly unbalanced fan blades , generating cyclical noise.

  • A buildup of frost on part of the exchanger, a sign of an ineffective defrost cycle.

Using our instruments, we then measured:

  • The pressure of R-410A refrigerant , slightly lower than the nominal values.

  • A high discharge temperature , indicating excessive compressor stress.

Diagnosis: A combined double problem

After analysis, we concluded that there was a combined problem of reduced airflow and partial refrigerant charge .
In other words:

  1. Dirt on the grid and exchanger reduced heat exchange efficiency.

  2. A microleak in a flare fitting caused a drop in refrigerant pressure .

This type of situation is common on older wall-mounted heat pumps, especially after several seasonal cycles without preventive maintenance.

Repair steps: rigor and precision

Our technician followed a protocol in three precise steps:

1. Complete cleaning of the condenser

  • Disassembly of the front grille.

  • Application of a specialized biodegradable cleaner for exchanger fins.

  • Rinse under low pressure to avoid twisting the fins.

  • Check the fan and lubricate the bearing.

2. Detection and sealing of microleaks

  • Nitrogen injection at 250 psi to pressurize the circuit.

  • Using an electronic leak detector to locate seepage at the flare fitting.

  • Re-tightening the seal with a new fitting and tightening to the correct torque .

3. System recharge and recalibration

  • Complete vacuum draw for 20 minutes.

  • Accurate recharging of R-410A refrigerant according to Daikin specifications.

  • Performance test: measurement of blowing temperature, delta T and power consumption.

Result: the heat pump immediately regained its full heating and cooling capacity .

Final result: comfort and efficiency restored

At the end of the intervention, the client noted:

  • A clear reduction in outside noise .

  • Even and stable heat inside.

  • More stable electricity consumption , thanks to a compressor operating at optimal pressure.

We've also taken the time to recommend annual maintenance before each heating season, which is essential to extending the life of a Daikin unit.

Why choose AirGreen for your Daikin repairs?

Daikin is renowned for its reliability, but even the best brands require rigorous maintenance.
At AirGreen , we are:

  • Daikin certified partners and specialists , with original parts always available.

  • Equipped for the diagnosis of Inverter and Multi-Zone heat pumps .

  • Present throughout Greater Montreal, Laval, the North Shore and the South Shore .

Our approach is based on transparency, technical precision and lasting customer satisfaction .

AirGreen Tips: Preventing Future Outages

To avoid similar problems:

  • Clean the internal filters every month .

  • Make sure the outdoor unit is clear of any obstacles (leaves, snow, dirt).

  • Schedule preventative maintenance in the spring and fall.

These simple actions can prevent up to 60% of compressor breakdowns observed by our technicians.

Conclusion: another satisfied customer in Sainte-Dorothée

Thanks to this rapid and methodical intervention, the customer's Daikin wall-mounted heat pump was back in service with optimal efficiency.
A successful repair, a sign of AirGreen's expertise , always serving residential comfort in the greater Montreal area.