T418 OAU LOW CFM — Not enough outside air is being drawn in

What does T418 OAU LOW CFM mean?

This alarm indicates that the ERV cannot bring in the desired amount of outside air. The actual outside air CFM is less than 10% of the commanded amount after 10 minutes.

• Outside air CFM setpoint set too high
• Dirty filter or plugged screen
• Pressure tubing wrong or disconnected
• Wrong OA CFM curve programmed
• RTU indoor fan speed running too low

Click steps to track your progress.

1. 1

   Clean or replace the air filter and any screens.

2. 2

   Verify the outside air CFM setpoint.

3. 3

   Inspect and ensure pressure tubing is correctly connected and undamaged.

4. 4

   Confirm the correct OA CFM curve is programmed.

5. 5

   Check the RTU indoor fan speed.