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Réparation d’une thermopompe murale Panasonic à Sainte-Thérèse
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Repair of a Panasonic wall-mounted heat pump in Sainte-Thérèse

Fast diagnosis and accurate repair of intermittent starting problem

At AirGreen , we frequently receive calls for wall-mounted heat pumps that suddenly stop responding or whose operation becomes erratic. This intervention in Sainte-Thérèse , on the North Shore of Montreal , concerned a Panasonic wall-mounted unit installed above an interior door, in a small hallway connecting the bedrooms. The customer noticed that the machine sometimes refused to start , even when the remote control sent the correct signal. In cold weather, the unit would flash without starting, indicating a communication error with the outdoor unit.

First inspection: signs of a faulty electronic card

Upon our arrival, our RBQ and CCQ certified technicians conducted a complete inspection of the wall unit . The Panasonic unit, with approximately 9,000 BTUs, exhibited several typical symptoms of an internal electronic problem :

  • Continuously flashing indicator light after a start attempt.

  • No indoor fan activation.

  • No audible signal from the start relay.

  • Main board temperature slightly elevated.

Disassembly of the front panel confirmed the presence of a slightly oxidized control board , probably as a result of excessive condensation due to ambient humidity. In addition, a signal connector connecting the temperature sensor to the motherboard was incorrectly inserted, causing an inconsistent reading and preventing automatic startup.

AirGreen intervention: repair, cleaning and complete calibration

To ensure a lasting repair, our team carried out a complete system upgrade :

  1. Safe disconnection of the power supply and dismantling of the complete facade.

  2. Internal cleaning of the control module with compressed air and isopropyl alcohol to remove any traces of oxidation.

  3. Tightening and checking the connectors between the board, the temperature sensor and the blower motor.

  4. Correct reinserting of the thermistor sensor into its original housing, often moved during previous maintenance.

  5. Testing the electronic board using a signal simulator to check the reaction to the infrared command.

  6. Temperature sensor calibration to ensure reliable automatic start.

  7. Cleaning air filters and coil to maximize airflow and reduce electrical load.

After reassembly and restart, the Panasonic heat pump resumed stable operation: immediate response to the remote control, smooth heating cycle and silence restored in the room.

Results: comfort restored and reliability assured

Tests carried out after repair confirmed:

  • Perfect communication between indoor and outdoor units .

  • Stable start-up at every request.

  • A blowing temperature in accordance with the manufacturer's specifications .

  • Reduced operational noise through complete fan cleaning.

The customer immediately noted a renewed responsiveness and better thermal comfort , particularly during morning starts.

AirGreen recommendations to avoid this type of breakdown

Panasonic wall-mounted heat pumps are renowned for their reliability, but their circuit boards remain sensitive to moisture and dust. To prevent future breakdowns:

  • Avoid sources of direct humidity (doors, poorly ventilated bathrooms or kitchens).

  • Clean the filters monthly to prevent accumulated heat from damaging the card.

  • Have the electrical connection and insulation checked by an AirGreen technician at least once a year.

  • Schedule preventative maintenance before the cold season to test communication between units.

Regular maintenance helps extend the life of the main board and maintain optimal energy performance.

AirGreen expertise in Sainte-Thérèse and across the North Shore

This intervention perfectly illustrates our expertise in residential HVAC system repair on the North Shore , particularly in Sainte-Thérèse, Blainville, Boisbriand and Terrebonne . Our specialized technicians are proficient in the brands Panasonic, Gree, Fujitsu, Sharp, Midea, Lennox, Goodman and Trane , and intervene quickly to diagnose, repair and maintain all types of wall-mounted heat pumps.

At AirGreen , every service call is handled with rigor, precision, and transparency. Our priority: ensuring consistent, lasting comfort for every home, whatever the season.