A service call for a warm air blowing problem
At AirGreen , we often receive calls from customers in Montreal whose wall-mounted heat pump no longer blows cold air even though everything seems to be working. This was recently the case in the Outremont neighborhood, where a customer contacted us about a Panasonic wall-mounted unit that, although apparently operational, was no longer able to cool the room.
The customer noticed that the indoor fan was running normally, but the air blown remained lukewarm, even after several minutes of operation. No error code appeared on the remote control—a situation that, while common, requires careful diagnosis.
Technical inspection: first check the refrigeration circuit
Once on site, our technician first carried out the basic checks:
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Air filtration : clean filters, without major dust accumulation.
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Communication between indoor and outdoor units : stable.
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Compressor cycle : no start detected at the outdoor unit.
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Refrigerant pressure (R-410A) : reading at zero PSI — a clear indication of a refrigerant gas leak .
The Panasonic heat pump was therefore in electronic safety mode: it refused to activate the compressor as long as the pressure remained insufficient, in order to prevent any mechanical damage.
Diagnosis confirmed: refrigerant leak on the suction line
We then used an electronic leak detector and confirmed the presence of gas near the connection smelled on the suction line, at the outlet of the outdoor unit. This type of leak, often caused by a micro-crack or an inappropriate tightening torque , is particularly common in installations exposed to intense thermal cycles like those in Montreal.
After validating the diagnosis, our team proceeded to:
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Complete recovery of the remaining gas in accordance with environmental standards (avoiding any atmospheric release).
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Disassembly of the sniffed fitting and re-crimping with a calibrated tool.
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The application of a controlled tightening torque to ensure a perfect seal.
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Vacuum the system for 25 minutes at -29 inHg to remove all traces of moisture.
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Recharging the circuit with R-410A refrigerant at the charge prescribed by the manufacturer Panasonic.
Final check and return to service
After recharging, the system was restarted. The measurements taken were as follows:
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Stable suction pressure at 120 PSI.
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Discharge pressure at 390 PSI.
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Blow-out temperature at 11.8°C — indicating optimal cooling performance.
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Compressor amperage meets manufacturer specifications.
We then validated the uniform air distribution in the room and tested the heating mode , which proved to be fully functional. The customer immediately noticed the difference: a stable and silent flow of cold air.
AirGreen Prevention and Maintenance Tips
To avoid this type of recurring breakdown, our technician explained several essential preventive measures to the customer:
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Visually check exterior fittings every spring, especially after periods of freezing weather.
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Have the refrigerant gas pressure inspected every two years for slow leaks.
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Clean the internal filters every month during the summer season.
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Avoid covering or obstructing the outdoor unit to maintain adequate air circulation.
These simple actions, combined with regular maintenance by AirGreen , considerably extend the life of the heat pump and maintain its energy performance.
AirGreen expertise: speed, transparency and reliability
Working in a residential environment in Outremont means dealing with older buildings and sometimes complex installations. Our certified HVAC technicians always intervene professionally, making sure to explain each step of the repair to the client.
In this specific case, the complete repair of the Panasonic system was carried out in a single visit thanks to our fully equipped workshop truck, allowing for vacuuming, refrigerant recharging and performance verification on site . The customer was able to regain comfort immediately, without any additional delay.
In summary:
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Problem detected: refrigerant leak on the suction line connection.
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Solution: reconnect the connection, draw a vacuum and completely recharge with R-410A.
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Result: restored cooling, optimal performance and satisfied customer.
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Location: Outremont, Montreal.
AirGreen , a specialist in the repair of wall-mounted heat pumps from Panasonic , Fujitsu, Gree, Midea, Sharp and several other brands, serves all of Greater Montreal , including Laval, Longueuil, the North Shore and the South Shore . Trust our expertise for durable, safe and guaranteed repairs.