A sudden breakdown, a quick diagnosis and a heat pump saved
At AirGreen , we know that a wall-mounted heat pump is much more than just a device: it's a pillar of Quebec's home comfort. Recently, our team was called to Sainte-Julie , on the South Shore of Montreal , to work on a Panasonic heat pump that refused to start, leaving the house without heating at the start of the cold season.
First observation on site
Upon our arrival, the customer explained that the outdoor unit seemed completely inert: no noise, no fan, no response to the remote control . The installation, mounted high on the rear facade of the building, appeared clean and relatively new. However, one detail caught our attention: the circuit breaker for the dedicated circuit had tripped several times during the week.
Step 1: Complete electrical diagnosis
Our technicians immediately checked:
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the supply voltage between terminals L1 and L2;
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continuity of wiring between indoor and outdoor unit;
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and the state of the internal fuse of the electronic card .
The result: a damaged control board caused a short circuit as soon as the start signal was sent. This failure, common on some wall-mounted models, often occurs after a power surge or moisture infiltration into the control box.
Step 2: Intervention and replacement of the card
Once the source of the problem is identified, we have:
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Turned off the main power and isolated the system.
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Removed the faulty electronic card .
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Cleaned the compartment with dry air and checked the condition of the connectors.
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Installed an original Panasonic replacement card , calibrated for this specific model.
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Tested the unit in heating and cooling mode to confirm signal stability and compressor responsiveness.
As soon as the power was turned back on, the heat pump came back to life: the fan started, the blowing temperature dropped to 10°C in cooling mode, and the house regained its thermal comfort.
Step 3: Preventive maintenance and advice
We also carried out a complete cleaning of the internal filters and a rinsing of the external coil , in order to guarantee optimal heat exchange. The customer appreciated our recommendations:
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keep filters clean every two months;
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avoid cutting off the power supply in winter (to allow automatic defrosting);
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Schedule an annual AirGreen inspection before the cold weather hits.
A repair that extends the life of the device
This type of electronic board repair is often perceived as complex, but thanks to our expertise and certified parts, we were able to avoid a complete unit replacement . The result: a refurbished system at a controlled cost, and a customer delighted to find consistent comfort in Sainte-Julie.
AirGreen reliability on the South Shore
Our team of qualified technicians operates throughout Montreal, Laval, Longueuil, as well as on the North Shore and the South Shore . Each service call is handled with the same rigor:
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precise diagnosis,
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transparency on repair options,
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and warranty on replaced parts.
We understand that a wall-mounted heat pump is a significant investment—that's why every intervention aims to maximize the unit's durability and energy efficiency .
In summary
The intervention in Sainte-Julie perfectly demonstrates our know-how: a rigorous analysis , a targeted repair , and exemplary customer service . At AirGreen, we believe that professional maintenance and a rapid response make all the difference between a temporary breakdown and a costly replacement.