An outdoor heat pump completely shuts down after a storm
At AirGreen , we were recently called to Saint-Bruno , on Montreal's South Shore , to diagnose and repair a Goodman wall-mounted heat pump whose outdoor unit was no longer starting. The customer had just experienced a violent storm accompanied by a brief power outage—and since then, there has been no sign of life from the compressor.
This typical failure, often caused by a power surge or electronic board failure, required careful inspection to avoid unnecessary compressor replacement.
Initial inspection: a stationary compressor and a silent power supply
Upon our arrival, we carried out a complete visual check of the installation.
The Goodman outdoor unit, securely mounted on galvanized steel wall brackets, had wiring in good general condition . No signs of burning or oxidation were visible at first glance.
Our measurements, however, revealed:
-
No voltage at the outdoor unit terminal block.
-
A partially tripped circuit breaker in the basement electrical panel.
-
A blackened power supply circuit board at the main relay.
These signs indicated a surge caused by lightning , a common scenario during summer storms in Quebec.
In-depth diagnosis: burnt-out control board and blown thermal fuse
We then carried out a detailed electrical diagnosis:
-
Continuity check on the thermal fuse on the control board.
-
Power contactor coil test — no response.
-
Compressor and fan verification via direct power supply (bypass test): both components were functional.
So the verdict was clear: the main control board had suffered a power surge .
Repair steps: rigor and safety
Our AirGreen team carried out the repair following a strict protocol:
1. Securing the electrical circuit
-
Complete power cut at the source.
-
Disconnect and isolate control wires.
-
Check that the main circuit breaker and neutral wire are in good condition.
2. Replacing the control board
-
Installation of a new original Goodman electronic card , compatible with the installed wall-mounted heat pump model.
-
Application of a dielectric protective varnish to prevent future corrosion.
-
Restoration of the wiring according to the manufacturer's diagram.
3. Recalibration and complete test
-
Reconnecting the indoor thermostat and synchronizing the communication signal.
-
Start-up test: The outdoor fan started running immediately , followed by the compressor activating after 15 seconds.
-
Checking the R-410A refrigerant circuit pressure: stable at 115 psi at rest and 380 psi under load.
Final result: restored comfort and enhanced safety
After 40 minutes of continuous testing, the Goodman heat pump was working perfectly in both heating and cooling mode .
The customer noticed:
-
A reduction in operating noise compared to before.
-
Better thermal stability inside.
-
Faster response to thermostat demand.
We also installed an AirGreen surge protector on the electrical circuit, an essential precaution in residential areas prone to frequent thunderstorms.
AirGreen Expertise: The Difference in Every Detail
At AirGreen , every HVAC system repair is carried out with method, precision and transparency .
Our certified technicians work on all major brands: Goodman, Midea, Fujitsu, Daikin, Gree, Trane, Sharp, and more.
Our guarantees:
-
Precise and documented diagnosis.
-
Use of original parts.
-
Energy optimization after repair.
-
Personalized advice for the longevity of your device.
We cover all of Greater Montreal, Laval, the North Shore and the South Shore , and we respond to all types of breakdowns, whether it is compressor, electronic card or refrigerant problems .
AirGreen tips to avoid similar breakdowns
To protect your Goodman wall-mounted heat pump:
-
Install an HVAC surge protector directly on the power circuit.
-
Turn off the power during severe thunderstorms .
-
Clean the outdoor unit twice a year to prevent overheating.
-
Have the electronic card checked every 3 to 4 years.
These simple actions extend the life of your system and reduce the risk of costly breakdowns.
Conclusion: A Goodman heat pump saved by AirGreen expertise
Thanks to a quick and methodical intervention, the Goodman wall-mounted heat pump in Saint-Bruno regained its full performance without the need for a complete replacement.
A new demonstration of AirGreen know-how , combining technical expertise, diagnostic precision and commitment to the lasting comfort of our customers.