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Maintenance & Troubleshooting

Problem & Solutions

HRV or ERV not running

  • Verify polarization
  • Verify breaker in electrical box
  • Verify that dehumidistat or switch on HRV or ERV are activated to supply power to unit
  • Unplug HRV or ERV verify if controller is wired correctly to the connection box on the side of the unit
  • Verify low voltage box (Duotrol™) on the unit

Air is too dry

  • Increase humidity level on dehumidistat
  • Switch ventilation mode from continuous to intermittent
  • Install a Imperial humidifier


Air too humid

  • Reduce the humidity level on the controller
  • Verify if dryer is venting in basement
  • Verify if heating wood is stored in basement
  • Wait for outside temperature to change.
    Ex. Summer can be extremely humid
  • Verify balancing of the H/ERV
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When should I service HRV/ERV?

Heat Recovery Core Unit

Once a year or as needed, vacuum the four surfaces, let soak in warm water for 15 minutes, then spray rinse and let dry.


Four times a year or as needed, vacuum the filters. Replace filters once a year.

Click here to buy your filters now.

Inside the Unit

Once a year or as needed, clean the interior of the unit (walls and drain pan) with a mild and non-abrasive soap. It is recommended to use products that are environmentally friendly.

Energy Recovery Core Unit

Once a year or as needed, vacuum the four surfaces, let soak in warm water for 15 minutes, then spray rinse and let dry.


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Home Ventilation
Heat Recovery Ventilation (HRV) or Energy Recovery Ventilation (ERV)?
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