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

A service call in the heat of summer

A resident of Sainte-Julie , on Montreal's South Shore , recently contacted us about a Sanyo wall-mounted heat pump failure . During a heatwave, his system was no longer producing cold air, and the outdoor compressor seemed completely inactive. At AirGreen , we often receive this type of call during peak periods—and our priority is always the same: restoring comfort quickly, without compromising on the quality of the diagnosis .

First inspection: a silent compressor and a stationary fan

Upon arrival, we found that the Sanyo outdoor unit, installed on the red brick back balcony, would not start at all. There was no compressor noise, no vibration, and a frozen fan. The indoor unit, however, appeared to be working properly, displaying the set temperature, but with no noticeable cooling.

We immediately performed a full electrical analysis to isolate the cause of the problem.

Step 1: Check the power supply

Our technicians checked the supply voltage at the circuit breaker and terminal block of the outdoor unit. Result: correct voltage, but no start signal transmitted to the compressor . This indicated a potential fault in the power relay or control board .

Step 2: Internal Visual Inspection

After removing the top panel of the unit, we noticed significant oxidation on the connectors and a swollen start capacitor . The latter is a key component that helps the compressor start—its failure perfectly explains the lack of start-up.

Repair and recommissioning

Replacing the capacitor

We replaced the original Sanyo start capacitor with one of equivalent capacity, in accordance with the manufacturer's specifications. After installation, a first test allowed us to hear the characteristic click of the relay , followed by the start of the compressor .

Checking the refrigeration cycle

Once the system was running, we measured:

  • Refrigerant pressure: stable and within the R-410A range.

  • Interior blowing temperature: 11.8°C , a sign of excellent heat exchange .

  • Compressor amperage: within standards, without overvoltage.

Cleaning and prevention

We took advantage of the intervention to clean the condenser fins , which are often clogged with dust and pollen. This simple maintenance improves heat transfer and reduces electricity consumption.
A protective anti-corrosion treatment has also been applied to the electrical connections, in order to prevent any future oxidation.

Result: a restored and more efficient system

Thanks to this intervention, the Sanyo wall-mounted heat pump regained its full cooling capacity. The customer immediately noticed a rapid drop in indoor temperature and quieter operation.

Concrete benefits:

  • Cooling restored in less than an hour .

  • Increased performance thanks to condenser cleaning.

  • Extended life of electrical components.

  • Reduced energy consumption after cycle calibration.

AirGreen Tips for Sanyo Wall-Mounted Heat Pump Owners

Although Sanyo systems are renowned for their reliability, they require regular maintenance to operate efficiently year after year. Here are our recommendations:

  1. Clean the interior filters every 4 to 6 weeks during the air conditioning season.

  2. Remove outdoor debris from around the outdoor unit (leaves, dust, snow).

  3. Have the refrigerant charge inspected every two years.

  4. Schedule an annual comprehensive maintenance by an AirGreen certified technician.

A simple check before summer can prevent a breakdown in the middle of a heatwave.

AirGreen expertise on the South Shore

Based in Montreal, we operate weekly in Sainte-Julie, Boucherville, Brossard, Saint-Bruno, Varennes and throughout the South Shore . Our certified technicians are fully familiar with Sanyo, Sharp, Fujitsu, Midea, Gree and Trane heat pump models, whether for repairs, maintenance or complete replacements.

Our approach is based on:

  • Precise diagnostics with calibrated instruments (multimeter, pressure gauge, thermocouple).

  • Original manufacturer parts for each brand.

  • Complete transparency on costs and deadlines.

At AirGreen, every repair is an opportunity to demonstrate our commitment to performance, reliability and customer satisfaction .

Conclusion: a sustainable repair by AirGreen

This Sanyo heat pump repair in Sainte-Julie is a good illustration of the AirGreen philosophy: to intervene quickly, diagnose rigorously, and offer a lasting solution.
With a simple part replacement and careful preventative maintenance, we have given this system a new lease of life , ready to face many seasons.