A service call for a heat pump that wouldn't start
At AirGreen , we were recently called upon to repair a Friedrich wall-mounted heat pump in Saint-Laurent , a residential neighborhood in Montreal. The customer contacted us after noticing that their outdoor unit was no longer starting, despite the indoor wall-mounted heat pump working properly. This is a typical problem that, without prompt intervention, can lead to a complete breakdown of the HVAC system.
Initial diagnosis: voltage present, but compressor inactive
Upon our arrival, our technician performed a series of electrical checks using the disconnect box attached to the brick wall. Power was flowing to the Friedrich unit, but there was no start signal to the compressor . This indicated a possible fault with the control board or start relay .
Using our professional multimeter and a continuity tester, we were able to confirm that the control circuit had abnormal resistance , suggesting a faulty electronic board .
Steps of repair: rigor and method
Once the diagnosis was confirmed, we carried out a complete repair according to AirGreen standards:
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Cut off the main power supply to ensure work safety;
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Disassembly of the cover and visual inspection of the electronic card;
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Identification of an area of overheating and microcracks on the welds;
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Replacement of the Friedrich control board with an original part;
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Checking the starter relay and capacitor;
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Complete cleaning of the electrical compartment before reassembly;
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Power up and full functional test .
Post-repair performance tests
Once the heat pump was back up and running, our team performed a complete refrigeration cycle check . Pressure and temperature measurements indicated optimal operation, and the Friedrich compressor returned to normal operation.
The customer could immediately feel the difference: the air blown by the wall head was 11°C cooler than the ambient temperature , proof of a fully restored cooling cycle.
Tips for extending the life of a Friedrich heat pump
We recommended several best practices to the customer to avoid another power outage :
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Schedule an annual professional maintenance , including a check of electronic cards and connections;
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Clean the internal filters regularly ;
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Check clearance around the outdoor condenser to ensure good ventilation;
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Never attempt to restart the unit multiple times in the event of a power outage, as this may further damage the control board.
AirGreen expertise: reliable interventions on all brands
This intervention in Saint-Laurent illustrates AirGreen's strength: combining precise diagnosis, original parts, and certified expertise to guarantee the durability of each HVAC repair.
Our specialized technicians work on all brands — Friedrich, Midea, Gree, Lennox, Fujitsu, Sharp, Bosch and many others — throughout Greater Montreal , including Montreal, Laval, Longueuil, the North Shore and the South Shore .
Thanks to our expertise, each service call is transformed into a sustainable and energy-efficient solution that restores comfort and peace of mind to our customers.