A quick service call for a failed PTAC system
At AirGreen , we were recently contacted by a client in Sainte-Julie , on the South Shore of Montreal , regarding an air conditioning problem with a Friedrich unit . This type of system, called a PTAC (Packaged Terminal Air Conditioner) , is frequently used in condos, seniors' residences, hotels, and multi-unit buildings. It is a unit integrated directly into the wall, combining heating and air conditioning in a single compact unit.
The customer had noticed for several days that the system was no longer responding correctly to commands and that no cold air was coming out, despite the operating indicator being on.
Initial diagnosis: a control board malfunction
Upon arrival, our technicians began by checking the PTAC's electrical components . The Friedrich unit showed signs of proper power, but no compressor or fan start-up. The control panel displayed unusual flashing lights, which pointed us toward an internal electronic fault .
Our checks have confirmed:
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A stable 240V power supply.
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No tripping of the circuit breaker or the built-in fuse.
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A functional fan and blower motor when powered directly.
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A faulty control board , preventing the compressor from starting.
This type of failure is common on PTAC units after several years of use, especially when dust and moisture accumulate in the electronic area.
Repair and recommissioning of the Friedrich PTAC
Step 1: Securing and Dismantling
Before any handling, we unplugged the unit and removed the front panel to access the control compartment. The unit had a slight accumulation of dust, which could cause short circuits on the board.
Step 2: Replacing the Control Board
We replaced the main control board with a genuine Friedrich part compatible with the Uni-Fit series. This ensures perfect compatibility with the temperature sensors and the display panel.
Step 3: Check the compressor and refrigeration system
Before closing, a continuity and resistance test on the compressor confirmed its good condition. The refrigeration circuit showed no visible leaks, and the pressure was within specifications.
Step 4: Cleaning and Calibration
The opportunity was taken to clean the evaporator and condenser coils , as well as the internal filters. We then performed a thermostat calibration test to ensure an accurate room temperature reading.
Result: restored performance and immediate comfort
After the repair, the Friedrich PTAC restarted without any problems. The compressor started up, delivering a constant and quiet flow of cold air. The customer immediately noticed the difference: stable temperature, smooth ventilation, and no vibrations.
We also recommended an annual preventive inspection , as PTACs installed in enclosed spaces tend to quickly accumulate dust and pollen in the filters and coils. Regular maintenance prevents overheating of electronic components and extends the life of the system.
Technical features of Friedrich PTAC systems
Friedrich Uni-Fit models are renowned for their reliability and robust design, but like any integrated system, they require:
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Regular cleaning of filters and coils .
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A condensation drain check to prevent water leaks.
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Periodic check of voltage and wiring .
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A control card monitor , sensitive to electrical variations.
These units typically use R-410A refrigerant , which is more environmentally friendly and efficient, but also requires more precise operating pressures. At AirGreen, we have all the equipment needed to perform these checks accurately.
A complete service by AirGreen
Our PTAC and VTAC system interventions cover the entire Greater Montreal area: Montreal, Laval, Longueuil, the North Shore and the South Shore . Our certified technicians travel quickly with replacement parts for major brands, including Friedrich, Gree, Midea, Amana, LG and Frigidaire .
Our commitments:
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Fast and accurate diagnosis
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Guaranteed repair
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Personalized maintenance advice
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Compliance with Quebec HVAC and environmental standards
Maintenance Tips for PTAC Owners
To avoid recurring breakdowns, we recommend:
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Clean filters every 4 to 6 weeks.
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Dust the exterior grille every season.
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Avoid obstructing the air outlet with curtains or furniture.
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Schedule an annual professional interview before the warm season.
These simple measures ensure consistent efficiency and reduce energy consumption.
In conclusion
This Friedrich PTAC repair in Sainte-Julie demonstrates the skill and rigor of our AirGreen technicians. Through a methodical approach and the use of genuine parts, we've brought a device essential to customer comfort back to life while extending its useful life.
For any repair or maintenance of residential or commercial HVAC systems , trust AirGreen , your local partner in air conditioning and heating on the South Shore , in Montreal , Laval , and throughout metropolitan Quebec.