- ETC has found that the airflow sensor used in the CEM is very sensitive, and can on occasion give false readings of lack of airflow. The CEM Airflow Deflector (ETC P/N 7050A1059) should be installed.
- The filters in the rack are dirty and not allowing adequate airflow to the rack. The filters should be cleaned, either with an air hose or tap water.
- The fan in the rack has stopped spinning and is no longer creating airflow in the rack. Replace the fan.
- The fan relay in the CEM could be the problem. This can be tested via the backdoor diagnostics airflow test.
- On Touring Racks, the fan is on the bottom of the rack. DO NOT STORE THE FEEDER CABLES UNDER RACK.
Workaround / Fix
- Remove filters, clean, dry, and replace.
Filters can be blown out, vacuumed, or washed out with water. If using water, make sure filter is completely dry before replacing into rack.
- Determine if the CEM or the fan is the problem, and obtain servicing on problem equipment.
- Install a CEM airflow deflector in the CEM to help direct airflow over the airflow sensor. (Part number 7050A1059)