When to Repair or Replace Your MVHR Unit

February 28, 2026

Mechanical Ventilation with Heat Recovery (MVHR) systems have become a cornerstone of modern, energy-efficient homes. By extracting stale air from kitchens, bathrooms, and utility areas while supplying fresh, filtered air into living spaces, these systems maintain indoor air quality without wasting heat. The heat recovery process allows warm air leaving the home to transfer its energy MVHR repairs to incoming fresh air, reducing heating costs and creating a more comfortable living environment. Despite their efficiency and sophistication, MVHR systems are mechanical devices and, like all such systems, can experience faults that require repair.

MVHR systems operate continuously, which means that components such as fans, filters, and the heat exchanger are always under stress. Over time, these components may wear out or become clogged with dust and debris. When this happens, the system’s performance can decline. Homeowners may notice rooms that feel stuffy, condensation forming on windows, or cooking and bathroom odors lingering longer than usual. These signs indicate that the system is no longer circulating air effectively and may need professional attention to restore proper operation.

Noise is another common symptom that indicates MVHR repairs may be required. These systems are designed to run quietly in the background, so rattling, buzzing, or grinding sounds are not normal. Such noises often result from worn bearings, loose internal components, or debris obstructing the fan. Ignoring these sounds can lead to further damage, ultimately increasing the cost and complexity of repairs. Addressing issues promptly helps maintain the system’s lifespan and ensures continued reliable operation.

Electrical faults can also affect MVHR performance. Many modern units rely on sensors and control panels to regulate airflow, maintain balance, and adjust settings automatically. If these controls fail, the system may stop functioning correctly, leading to poor air circulation or uneven temperatures. Attempting to fix electrical issues without proper knowledge can be dangerous and may void warranties. Professional technicians have the expertise to diagnose and repair such problems safely and efficiently.

The heat exchanger, the heart of the MVHR system, is crucial for maintaining energy efficiency. If the exchanger becomes dirty or damaged, the system loses its ability to transfer heat effectively. This can result in higher heating bills and reduced comfort. Cleaning or replacing the heat exchanger as part of a repair ensures the system continues to deliver the energy savings it was designed for. Regular servicing can prevent these issues from occurring, helping homeowners maintain consistent performance over time.

Ultimately, MVHR repairs are essential for ensuring that homes remain comfortable, energy-efficient, and healthy. Timely maintenance and professional intervention prevent minor faults from escalating into costly problems and ensure that indoor air quality is preserved. By investing in proper care and repairs, homeowners can enjoy the full benefits of their MVHR system, including balanced ventilation, reduced energy consumption, and a consistently comfortable environment throughout the year.