Mechanical Ventilation with Heat Recovery (MVHR) systems are designed to provide fresh air while retaining heat, helping homeowners maintain energy efficiency and indoor comfort. However, like any mechanical system, MVHR units require proper maintenance to function at their best. When neglected, performance can decline, leading to higher energy bills and poor air quality. Below are five common MVHR problems and practical ways to fix them.
- Blocked or Dirty Filters
One of the most frequent issues with MVHR systems is clogged filters. Over time, dust, pollen, and debris accumulate, restricting airflow and reducing heat recovery efficiency. This can cause the system to work harder, increasing energy consumption.
How to fix it:
Filters should typically be checked every 3–6 months and replaced or cleaned according to the manufacturer’s guidelines. Regular filter maintenance is one of the simplest and most cost-effective ways to keep your system operating efficiently.
- Reduced Airflow or Imbalanced Ventilation
If certain rooms feel stuffy while others have excessive airflow, your MVHR system may be unbalanced. Poor airflow can result from blocked ducts, incorrect commissioning, or failing fans.
How to fix it:
Inspect vents to ensure they are not obstructed by furniture or dust buildup. If the issue persists, professional rebalancing may be required to restore optimal airflow distribution throughout the property.
- Excessive Noise
An MVHR unit should operate quietly. Unusual noises such as rattling, humming, or vibration often indicate loose components, worn-out bearings, or debris inside the unit.
How to fix it:
Check for loose screws or mounting brackets. If noise continues, the internal fans or motor may need servicing or replacement. Addressing noise early can prevent more serious mechanical damage.
- Condensation and Moisture Problems
Ironically, a system designed to manage air quality can sometimes contribute to condensation issues if not functioning properly. This may be due to blocked condensate drains or insufficient airflow.
How to fix it:
Ensure the condensate drain pipe is clear and properly installed. Regular servicing helps prevent moisture buildup and reduces the risk of mould growth.
- Complete System Failure
Power issues, faulty controls, or worn components can cause an MVHR system to stop working entirely. In such cases, quick action is essential to avoid prolonged ventilation problems.
How to fix it:
First, check the power supply and control settings. If the problem remains unresolved, professional MVHR repairs may be necessary to diagnose and replace defective components safely and effectively.
The Importance of Professional Support
While basic maintenance can be handled by homeowners, more complex issues require expert attention. Routine servicing not only prevents costly breakdowns but also ensures your system delivers consistent energy efficiency and clean indoor air.
For reliable inspection, maintenance, and repair services, it is highly recommended to work with experienced specialists such as lhe.london. Their professional approach ensures your MVHR system remains efficient, quiet, and fully functional all year round.
