Sudden breakdown on a York outdoor unit
At AirGreen , we know that a heat pump failure can occur at any time, especially after several seasons of intensive use. This is exactly what happened to a residential customer in Saint-Léonard , Montreal, whose York wall-mounted heat pump had stopped working in cooling mode as temperatures rose rapidly.
The outdoor unit, securely mounted on a galvanized steel wall bracket, appeared intact at first glance. However, upon initial inspection, our technician noticed an irregular electrical noise upon startup and a failure of the fan to turn on .
Diagnosis: Power problem and faulty boot component
To diagnose the fault, our team followed a methodical approach:
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Checking the supply voltage at the breaker box installed next to the compressor: correct voltage at 240V.
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Inspection of the control relay and the starting capacitor : the capacitor showed visible swelling , a clear sign of deterioration.
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Compressor resistance measurement : normal values, excluding main motor failure.
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Checked wiring and thermal fuse : no signs of short circuit or overheating.
The verdict: defective start capacitor , a critical component that allows the compressor and fan to start under load.
Intervention: replacement of the capacitor and reactivation of the system
Once the diagnosis was confirmed, our technician carried out a complete overhaul of the starting circuit.
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Safely disconnect the unit and discharge the capacitor before intervention.
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Installation of a new York 45+5 µF capacitor , perfectly compatible with the existing model.
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Check polarity and quick connections to avoid false contact.
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Soft restart of the system and monitoring of the inrush current at startup (7.8 A measured, compliant).
As soon as it was restarted, the outdoor unit restarted normally, the fan started to rotate silently , and the air blown inside regained its initial freshness.
Additional checks and preventive maintenance
Our technicians never just replace a part: they ensure that the HVAC system is functioning optimally. After the repair, we performed:
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A pressure test of R-410A refrigerant , confirming perfect circuit balance.
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A check of the indoor air flow , with a temperature difference of 10°C between the inlet and the outlet.
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A visual inspection of the electrical connections and protective wiring on the rear panel.
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A check of the clearance around the outdoor unit , often obstructed by vegetation in summer.
We have also added an additional protective sleeve over exposed electrical conduits to improve safety and prevent water infiltration.
AirGreen Tips to Extend the Life of a York Heat Pump
To ensure the longevity of your HVAC system , we always recommend:
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Regular cleaning of outdoor coils (at least twice per season).
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Annual inspection of capacitors — these parts are often the first to fail after 5 to 7 years of use.
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Clearing obstructions around the unit (plants, debris, snow).
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Monitor for abnormal noises : Repeated buzzing or clicking sounds may indicate an emerging electrical problem.
An annual AirGreen preventive maintenance includes all these points and allows anomalies to be detected before they cause a complete breakdown.
Result: comfort restored and efficiency restored
Thanks to this rapid intervention, the Saint-Léonard customer immediately regained comfort . His York heat pump, after replacing the capacitor, returned to optimal performance.
We concluded the visit with a 30-minute performance test , confirming:
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A stable indoor air temperature of 21°C.
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A compressor operating at nominal pressure.
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No abnormal fluctuations in the electrical current.
All this without service interruption or costly compressor replacement.
AirGreen: your HVAC reference in Greater Montreal
Each heat pump repair is an opportunity for us to demonstrate our technical rigor and attention to detail.
Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our teams intervene quickly, efficiently and safely.
AirGreen is the guarantee of local, professional and sustainable service — so that your York, Fujitsu, Midea, or Sharp system remains efficient year after year.
AirGreen — HVAC Experts in Montreal, Laval, Longueuil, North Shore and South Shore
Your comfort is our mission.
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