Oxygen 8 SERENA - User Manual

Questions and Answers

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shane37Aug 13, 2025
Why is the airflow too low in my Oxygen 8 SERENA Fan?
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  Stephen HernandezAug 13, 2025
  If the airflow from your Oxygen 8 Fan is too low, several factors could be responsible. Firstly, for units without built-in Automatic Electronic Air Balancing, the ERV airflow might be improperly balanced, requiring a professional to balance the unit. Secondly, a clogged filter, obstructed core, or a blocked exterior fresh air supply can also restrict airflow. Clean or remove any blockages. Thirdly, restricted ductwork or a low power supply (low voltage) can cause this issue, so inspect the duct installation and call an electrician to check the voltage, respectively.
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Monique JonesAug 16, 2025
What to do if LEDs on Oxygen 8 SERENA Fan Timer Switch flashes 0.5 seconds On, 2 seconds Off?
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  David SmithAug 16, 2025
  If the LEDs on the Main Control Board and the remote wall mount Timer Switch of your Oxygen 8 Fan are flashing 0.5 seconds On, 2 seconds Off, then repeats the cycle, this could indicate an open circuit in the exhaust fan. The suggested solution is to replace the motor. Another possible cause is that the motor burned or the fan overheated. In these cases, it's advisable to call a technician and, if possible, replace the fan.
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Angela RiddleAug 20, 2025
What does it mean when Oxygen 8 SERENA Fan Timer Switch flashes 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, then 2 seconds Off?
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  jenniferabbottAug 20, 2025
  If the LEDs on the Main Control Board and the remote wall mount Timer Switch of your Oxygen 8 Fan are flashing 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, then 2 seconds Off, then repeats the cycle, it could be due to a damper obstruction. Check the backdraft damper to ensure no screw interferes with its function. Alternatively, an exhaust fan jam or over-current could be the cause, in which case you should replace the fan.
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Kathleen NorrisAug 25, 2025
Why is Oxygen 8 SERENA Fan Timer Switch flashing 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, 2 seconds Off?
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  Angela OlsonAug 25, 2025
  If the LEDs on the Main Control Board and the remote wall mount Timer Switch of your Oxygen 8 Fan are flashing 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, 2 seconds Off, then repeats the cycle, it may be due to a supply fan open circuit. Replacing the motor is the suggested solution. Another possibility is that the motor burned or the fan overheated, in which case you should call a technician and, if possible, replace the fan.
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dthompsonAug 27, 2025
What does it mean when Oxygen 8 SERENA Fan Timer Switch flashes 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, 2 seconds Off?
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  Jason FowlerAug 27, 2025
  If the LEDs on the Main Control Board and the remote wall Timer Switch of your Oxygen 8 Fan are flashing 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On / 0.5 seconds Off / 0.5 seconds On, 2 seconds Off, then repeats the cycle, a likely cause is a damper obstruction. Check the back-draft damper to ensure no screw interferes with its function. Another cause could be a supply fan jam, which would require replacing the fan.
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Sarah CrawfordAug 31, 2025
Why is my Oxygen 8 Fan blowing cold air?
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  Robert MccannSep 1, 2025
  If you sense cold air coming from the supply of your Oxygen 8 Fan, it could be due to several reasons. First, the exhaust hood outside the house might be blocked; remove the blockage and clean the hood. Second, the ERV airflow might be improperly balanced, especially in units without built-in Automatic Electronic Air-Balancing, in which case you should have a professional balancer or contractor balance the unit. Lastly, extremely cold outdoor temperatures can cause this; consider installing a duct heater.
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Brandi HayesSep 4, 2025
What to do if Oxygen 8 SERENA Fan is not defrosting properly?
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  Nicole ObrienSep 4, 2025
  If your Oxygen 8 Fan unit is not defrosting properly, it could be due to a few reasons. The fresh air duct may be frozen, so you should check and remove any ice. Additionally, the ERV airflow may be improperly balanced, requiring a professional balancer or contractor to balance the unit. Finally, the temperature sensor may be defective, and you may need to replace it.
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hilljohnSep 8, 2025
Why doesn't the Oxygen 8 SERENA Time switch light stay on?
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  Joshua DunnSep 8, 2025
  If the Time switch 20 / 40 / 60 minute / Intermittent Switch light on your Oxygen 8 Fan doesn't stay on, it could be due to a loose connection; check the connection. Alternatively, the switch itself may be defective, requiring replacement. Finally, try resetting the main controller.