Fast diagnosis and professional repair on a dual Sanyo R410A system
At AirGreen , we were recently called for HVAC repair service on two Sanyo wall-mounted heat pumps installed on the rear facade of a red brick building in Montreal 's Côte-des-Neiges neighborhood. The customer contacted us after noticing a loss of heating efficiency on one of the units and an intermittent metallic noise coming from the other.
On-site inspection: two independent wall units, same symptoms
Upon our arrival, our technicians first observed the configuration:
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Two Sanyo Inverter compressors installed high on wall brackets;
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Each unit powered an independent indoor wall head;
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The refrigerant used : R410A, a high-performance gas but sensitive to micro-leaks;
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The refrigeration and electrical lines were well sheathed, but showed some signs of wear near the connections.
After an initial electrical and pressure check, our instruments revealed:
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A drop in pressure in the refrigeration circuit on the first unit;
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A dirty condenser and an unbalanced fan on the second, cause of the reported noise.
Step 1: Search for and seal refrigerant leaks
For the first heat pump, we conducted a leak search using an electronic detector and a nitrogen gas test. The problem stemmed from a poorly tightened flare fitting behind the outer sheath, probably weakened by temperature cycles.
We have :
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Empty the circuit,
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Cleaned and tightened the fittings,
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Replaced the flare joint,
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Pulled a complete vacuum before recharging the circuit with new R410A according to the manufacturer's specifications.
Step 2: Balancing and cleaning the outdoor fan
The second unit, on the other hand, was emitting a constant vibrating noise at startup. After removing the housing, we noticed a slight misalignment of the propeller caused by a buildup of debris in the grille. We have:
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Removed the fan, cleaned the blades,
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Rebalanced the hub,
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Lubricated the engine,
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Checked the stability of the wall plate (no excessive play detected).
Operation immediately returned to normal sound stability and performance.
Results: restored efficiency and reassured customer
After restarting both units, the final readings showed:
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A stable pressure of 120 psi in heating mode,
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A compliant indoor/outdoor temperature differential (≈ 21°C → 31°C),
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Power consumption within the standards for Sanyo Inverter systems.
The customer noted a significant improvement in thermal comfort from the first hours, and above all, the complete elimination of parasitic noise.
AirGreen Tips to Extend the Life of Your Wall-Mounted Heat Pumps
Our technicians remind that for units of this generation:
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Annual preventive maintenance is essential (cleaning the condenser, inspecting the fittings);
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Minor vibrations and leaks are common after 10 years of service;
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Professional cleaning and leak testing can prevent a loss of performance of more than 25%.
At AirGreen, we carry out these repairs throughout Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore , with parts compatible with Sanyo and Panasonic , historically linked brands.
AirGreen Expertise: Reliability Above All
Thanks to our experience with older R410A systems and newer R32 models, we ensure fast, accurate, and environmentally compliant repairs. Our priority: restoring performance without unnecessary replacement .
If your Sanyo wall-mounted heat pumps or any other HVAC system show signs of weakness (leakage, noise, declining performance), our Montreal-based response teams will quickly come to diagnose, repair and optimize your system, whether it is Sharp, Fujitsu, Gree, Midea, Goodman or Lennox .