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

Interrupted comfort in a residential corridor

At AirGreen , we know that a simple problem with a wall-mounted heat pump can quickly disrupt the comfort of a home, especially when the unit serves several rooms at once. This is exactly the situation encountered during this service call in Sainte-Julie , on the South Shore of Montreal. The customer contacted us after noticing that his Daikin wall-mounted heat pump was no longer blowing hot air, despite a normal display on the wall-mounted remote control.

Context: a central installation in a corridor

The Daikin wall-mounted unit, conveniently placed in the hallway connecting the bedrooms and bathroom , usually provided good temperature distribution throughout the area. But for several days now, no heat had been coming out of the unit , and the indoor fan seemed to be running more slowly than usual.

Diagnosis: Sensor and communication board problem

Upon our arrival, we carried out a series of methodical tests:

  • Reading the Daikin error code via the built-in diagnostic mode, revealing a communication anomaly between the indoor and outdoor modules.

  • Checking the voltages at the terminal block , confirming that the current was reaching the capacitor.

  • Inspection of temperature sensors (thermistors) , one of which showed inconsistent resistance with ambient temperature.

The verdict: A damaged communications board caused by a minor power surge, combined with a faulty thermistor sensor preventing the unit from detecting the correct interior temperature.

Complete repair and return to service

We have carried out:

  1. Replacement of the indoor temperature sensor with a genuine Daikin part.

  2. Installation of a new communication card synchronized with the external module.

  3. Complete cleaning of the filter and coil , taking advantage of the intervention to improve the overall performance of the device.

  4. Calibration of the air flow , to ensure uniform distribution in the corridor and adjoining rooms.

Once these steps were completed, we restarted the system and confirmed the heating mode was working : stable temperature, minimal noise, and regular airflow. The customer quickly regained the balanced thermal comfort he so appreciated.

Maintenance tips for hallway installations

Wall-mounted heat pumps installed in narrow spaces such as corridors require special attention:

  • Clean filters every 2 months to avoid airflow restriction.

  • Make sure nothing obstructs the sides of the unit , even small wall decorations.

  • Schedule an annual professional service , especially before winter, to check pressures and electronic calibration.

  • Install a surge protector to protect electronic boards from electrical fluctuations.

Result: efficiency restored and customer satisfied

Thanks to this quick and targeted repair , the Daikin wall-mounted heat pump in Sainte-Julie is operating at full capacity again. Hot air circulates efficiently to all adjacent rooms, and the customer benefits from a reliable and energy-efficient HVAC system .

At AirGreen, we operate every day in Montreal, Laval, Longueuil, on the North Shore and the South Shore to diagnose, repair and maintain all types of residential HVAC systems, always ensuring to combine performance, durability and absolute comfort .