How to Clean Your ERV

By Melanie Dawn

February 28, 2026

Energy-efficient homes are airtight, resulting in lower heating bills, fewer drafts, and consistent indoor temperatures. The downside is that homes sealed tightly against the elements can’t breathe on their own. An energy recovery ventilator acts like the lungs of the home. It helps swap stale and polluted indoor air for fresh outdoor air.

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To keep the system running as it should and extend the unit's lifespan, you’ll need to perform regular ERV maintenance.

How Do You Perform Energy Recovery Ventilator Maintenance?

Before starting, it’s important to gather the materials you’ll need for ERV maintenance. The following ERV maintenance checklist can help.

A vacuum with a soft brush attachment. This tool is required to clean the internal components and the core.
Mild dish detergent. Choose a grease-cutting dish detergent to remove grease and build-up on the filter and plastic parts.
Laundry tub or two large buckets. Fill one bucket with soapy water and the other with clean water for rinsing.
Microfiber cloths. Use microfiber cloths to wipe down interior metal walls, leaving no lint behind.
A screwdriver or drill with bits. Depending on the model of your ERV, a Phillips head or hex driver may be needed to remove the exterior access door or hood vents.
Small bottle brush or pipe cleaner. These are used to clean out the condensate drain line.
Replacement filters. If your unit has a disposable HEPA filter, replace it when performing ERV maintenance.

Step 1: Safety

Before performing any energy recovery ventilator maintenance, locate the power cord and unplug the unit from the wall outlet. If your ERV is hardwired into your electrical system, turn off the correct breaker in your breaker box. Make sure the indicator lights are off and the unit has stopped working before moving to the next step.

Step 2: Open the Unit

Remove the screws on the front access door of the ERV unit and carefully open the door. Some doors have hinges, while others completely slide off. Set the door aside.

Step 3: ERV Filter Cleaning

Most systems have a filter running to the outside of the unit and one for the fresh air coming inside your home. Check your owner’s manual if you’re unsure how to wash ERV filters. Slide the filters out of their tracks. If you have disposable filters, throw them away and replace them. For permanent filters, soak them for 10 to 15 minutes in a tub of soapy water. Scrub them with a soft brush and rinse them with clean water. Sit them in an upright position to dry before reinstalling them.

Step 3: ERV Heat Exchanger Cleaning

The core is the diamond or square-shaped block in the center of the unit. This is where heat and moisture exchange happens.

Gently slide the core out of the unit and inspect the channels on the outside walls. Over time, dust and debris settle into these crevices, which can reduce airflow. Use a soft brush to vacuum each of the four sides of the core. Move the brush in the direction of the fins, taking care not to press hard.

Important note: Never soak the ERV core in water unless your owner’s manual specifically tells you to do so. Some ERV cores are made of paper or sand-coated materials. Soaking it in water can cause it to swell and fall apart.

Step 4: Addressing the Interior Cabinet and Fans

Examine the interior of the ERV cabinet. If it’s been a while since the system has been cleaned, you’ll see a lot of dust in the corners and grime on the bottom. Use a damp microfiber cloth to wipe down the inner walls, the sliding tracks for the filters, and the bottom of the tray.

Next, use the soft brush attachment on your vacuum and clean the dust from the motor fans. For caked-up dirt, wipe each blade with a damp cloth, taking care not to get any water in the motor housing.

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Step 5: Clear and Inspect ERV Vents

Locate the fresh air intake vents and the stale air exhaust hood on the exterior of your home. The two are typically at least 6 feet apart.

Use a whisk broom or your vacuum to clear away spider webs, birds’ nests, and leaves from the screens. If the screens are removable, take them out and soak them in soapy water. Check the flaps on the exhaust hood to make sure they open and close freely. If they are stuck in an open position, drafts may enter your home. If they stick closed, stale air won’t be able to move to the outside.

Step 6: Check the Condensate Drain Line

Most ERVs have a drain line to handle water in extreme humidity. Look for a small plastic tube that travels from the bottom of the unit to a drain pan. Over time, algae and mold may grow inside, which causes leaks and clogs. Pour a cup of very warm water into the pan at the bottom of the unit and watch the drain. If water doesn’t flow, the pipe is clogged. Remove the tube and flush it with a solution of vinegar and hot water or use your pipe cleaner to clear the blockage. Finally, clean the ERV drain pan by wiping it with a wet microfiber cloth.

Step 7: Reassemble the ERV

Allow all the parts to dry completely before putting the ERV back together. Reinstall the drain line and then slide the core back into place. The core should only fit one way but be sure to check the airflow labels to ensure it’s correctly in place. Next, slide the air filters back into their tracks. Screw the door latch in place and flip the breaker to the system.

Step 8: Reset the System

Turn the unit on high at the wall control. Listen for any rattling or strange noises and perform an ERV airflow check to make sure the unit is running as it should. If it has a filter maintenance light on the wall control, reset it by holding the button for at least five seconds. For best results, your ERV maintenance frequency should be once every six months.

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