A complex electronic failure quickly brought under control by our HVAC experts
At AirGreen , our technicians work weekly in the metropolitan area to diagnose and repair residential and commercial HVAC systems . That day, our team was called to Boisbriand , on the North Shore of Montreal , for a Midea wall-mounted heat pump that had suddenly broken down.
Symptoms reported by the client
The owner contacted us after noticing that:
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The outdoor unit would no longer start.
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The indicator light on the indoor unit was flashing continuously.
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No compressor or fan noise was audible.
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The device displayed an error code related to the electronic card (E6).
A typical situation of a communication problem between the indoor and outdoor modules, often caused by a faulty control board .
On-site diagnosis: damaged main board
Our certified technician performed a voltage and continuity test to isolate the source of the problem. Power was reaching the main board, but no communication was being transmitted to the indoor module .
By opening the technical compartment of the outdoor unit, we quickly located the fault:
The main electronic board showed signs of overheating at a connector (blackening of the circuit and burning smell).
Steps of repair
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Complete power cut to ensure the safety of the intervention.
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Dismantling the exterior facade and extraction of the damaged electronic card.
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Visual inspection and cleaning of the connectors, to verify that no traces of humidity or secondary short circuits were present.
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Installation of a new original Midea control board , perfectly compatible with the AOQ36RLAVM model.
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Complete reconnection of the wiring according to the manufacturer's diagram, ensuring that each connector (power supply, sensors, compressor, fan) was securely attached.
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Power up and calibrate the system , including synchronization between the indoor and outdoor units.
Result: a Midea heat pump that is once again efficient
After restarting, the heat pump restarted without error.
Our checks have confirmed:
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Stable communication between modules.
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Smooth compressor start after a 3-minute delay.
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Optimal performance : blowing temperature at 11.8°C after 5 minutes of operation.
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No residual error codes .
The customer immediately noticed the difference: the comfort of his home was restored, and the system returned to its original performance.
Why is the electronic card so critical?
The control board acts as the “brain” of the HVAC system:
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It manages communication between the sensors, the compressor and the fan.
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It controls power modulation according to demand.
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It ensures the safety of components, particularly in the event of overvoltage or freezing.
A failure of this card can therefore completely immobilize the device. This is why we recommend annual preventive maintenance , which includes checking the electrical connections and the supply voltage .
AirGreen Tips to Extend the Life of a Midea Heat Pump
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Have electrical connections checked annually to prevent arcing or power surges.
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Avoid uncertified extension cords or power bars , which can cause harmful fluctuations to the card.
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Protect your outdoor unit with a suitable surge protector, especially in areas prone to thunderstorms.
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Clean the internal filters regularly to prevent unnecessary overheating of the compressor.
AirGreen Expertise: Precision, Safety and Reliability
Every AirGreen intervention is carried out with professional diagnostic tools and original parts supplied directly by authorized manufacturers.
Our technicians follow strict HVAC industry standards to ensure:
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The electrical safety of your installation.
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A durable and certified repair .
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Optimal energy efficiency , guaranteeing long-term savings and comfort.
AirGreen operates daily in Montreal, Laval, Longueuil, on the North Shore and the South Shore , for all Midea, Fujitsu, Gree, Lennox or Mitsubishi heat pump repairs .
Whether it's a faulty electronic board , a broken compressor or a refrigerant leak , we have the expertise to bring your system back to life quickly and safely.