Mechanical Ventilation with Heat Recovery systems, widely known as MVHR, play a crucial role in maintaining healthy indoor environments in modern airtight homes. Designed to extract stale air and replace it with fresh, filtered air while recovering heat that would otherwise be lost, these systems support both comfort and energy efficiency. Because MVHR units operate continuously throughout the year, they are subject to natural wear and tear. When faults develop, timely repairs are essential to maintain airflow balance, protect energy savings, and ensure consistent indoor air quality.
Over time, the internal components of an MVHR system can become affected by dust accumulation, moisture exposure, and general mechanical strain. Filters are particularly vulnerable, as they capture airborne particles such as dust and pollen. When filters become blocked, airflow is restricted MVHR repairs and the unit must work harder to circulate air throughout the property. This increased strain can reduce efficiency and accelerate the deterioration of fans and motors. If neglected, what begins as a simple maintenance issue can gradually develop into a more complex mechanical problem requiring professional repair.
Another common cause of MVHR malfunction is fan or motor wear. Since these systems run for extended periods, sometimes continuously, moving parts naturally experience fatigue. A failing fan may produce unusual sounds such as humming, rattling, or vibration. In some cases, homeowners notice uneven ventilation, with certain rooms feeling stuffy or humid while others remain comfortable. These warning signs indicate that the system is no longer operating at optimal capacity and should be assessed by a qualified technician before further damage occurs.
Heat exchangers are central to the efficiency of an MVHR unit. Their purpose is to transfer warmth from outgoing stale air to incoming fresh air without mixing the two streams. When the heat exchanger becomes dirty or damaged, the system’s ability to recover heat declines. This can lead to higher heating costs and reduced overall performance. Professional repair services often include careful cleaning or replacement of the heat exchanger to restore the system’s energy-saving capabilities.
Ductwork issues can also impact system effectiveness. Air leaks, poor insulation, or blockages within the ducts may compromise airflow and cause condensation problems. In tightly sealed homes, even small duct leaks can significantly reduce efficiency. Skilled technicians can inspect duct connections, reseal joints, and ensure that airflow remains balanced throughout the property. Addressing these concerns not only improves performance but also helps prevent long-term structural moisture damage.
Electrical faults are another area that may require attention. Modern MVHR systems include control panels, sensors, and circuit boards that regulate airflow rates and temperature exchange. If these controls malfunction, the system may fail to respond correctly to changing ventilation needs. Professional diagnostics allow technicians to identify wiring issues or component failures and implement safe, effective repairs.
Regular servicing remains one of the most effective ways to reduce the need for extensive repairs. Routine inspections allow minor issues to be corrected early, preserving system lifespan and reliability. By investing in professional MVHR repairs when needed, homeowners safeguard indoor comfort, energy efficiency, and the long-term performance of their ventilation system.