A service call for a hotel appliance that has become residential
At AirGreen , we often receive calls for PTAC (Packaged Terminal Air Conditioner) systems , the built-in air conditioners typically used in hotels, condos, or offices. This time, our team went to Saint-Lambert , on the South Shore of Montreal , to work on a Friedrich Uni-Fit air conditioner installed in a residential apartment.
The customer contacted us after noticing that the unit was blowing lukewarm air despite the temperature being set to maximum. A common problem with PTACs , often caused by a faulty sensor or an obstruction in the airflow.
Inspection and diagnosis of the Friedrich unit
Upon arrival on site, our technician performed a complete check of the electronic control panel . The Friedrich Uni-Fit unit was displaying an intermittent error code, indicating a temperature sensor anomaly .
After removing the front fascia, several important observations were made:
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Air filters completely clogged with dust.
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Dirty and partially dislodged room sensor .
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Evaporator encrusted with residue , reducing heat exchange.
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Accumulation of stagnant condensate in the lower tray, potentially causing odors and leaks.
Steps of repair
1. Deep cleaning of the system
We began by thoroughly cleaning the evaporator coil and condenser with a biodegradable disinfectant solution. The air filters were removed, washed, and dried, then replaced. This cleaning immediately improved airflow.
2. Replacing the temperature sensor
The room temperature sensor (thermistor) was replaced with an original Friedrich part and then recalibrated via the integrated electronic module. This sensor is essential for maintaining a stable room temperature and preventing unwanted on/off cycles.
3. Electrical check and drain leveling
We also checked the supply voltage (120V), the condition of the compressor relay and the drainage pump . After a short refill of the drain pan, the condensate flowed properly to the outside, eliminating any risk of internal humidity.
4. Final performance test
Once the unit was reassembled, a complete 20-minute test was performed:
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Blowing temperature: 11°C measured at the air outlet.
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Noise level: complies with Friedrich specification (< 47 dB).
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Power consumption: normal and stable.
The customer was able to directly observe the return of optimal cooling , accompanied by a notable reduction in operating noise.
A typical case: residential PTACs require appropriate maintenance
This type of installation, originally commercial, requires special attention when used in a residential environment. Friedrich PTACs are robust, but they quickly accumulate dust and moisture if the filters are not cleaned regularly.
Our technicians recommend:
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Cleaning the filters every two weeks during the summer.
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A complete maintenance (interior and exterior) at least once a year.
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Sufficient clearance around the unit to allow ventilation.
Neglected maintenance can lead to compressor or electronic board failures, which are often costly to repair.
AirGreen expertise: precision, speed and transparency
In Saint-Lambert , as elsewhere on the South Shore , AirGreen stands out for its ability to quickly diagnose faults, even on less common equipment such as PTAC systems . Our technicians have the necessary equipment to intervene on site, without completely dismantling the wall.
Each repair is documented with:
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temperature readings,
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before/after photos,
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and personalized recommendations for the client.
We work on all major brands: Friedrich, LG, Gree, Midea, Goodman, Sharp, Bosch, Trane , and many others. No matter the type of machine— wall-mounted, central, MultiZone, or PTAC —we offer precise, fast, and durable service in Montreal, Laval, Longueuil, the North Shore, and the South Shore .
Final result: comfort restored and reliability guaranteed
After the intervention, the PTAC Friedrich air conditioner regained its original performance . The customer immediately felt an improvement in thermal comfort , without parasitic noise or temperature fluctuations.
This service once again demonstrates the importance of preventive maintenance and AirGreen's technical know-how , where every detail counts to ensure the performance and longevity of HVAC systems.
In summary , this intervention in Saint-Lambert perfectly illustrates the AirGreen philosophy:
✔ Rigorous diagnosis,
✔ Fast and durable on-site repair,
✔ Personalized maintenance for maximum efficiency.