Full Bag Indicator (Fbi); Full Bag Light Will Not Come "On; Bag Is Full But The Fbi Did Not Come "On; Bag Is Not Full And The Fbi Light Is On - Simplicity SYNERGY X9.5 Service Manual

B. Full Bag Indicator (FBI)
B.1. Full bag light will not come "ON".
The full bag indicator is controlled by temperature. As the bag fills, the air flow is restricted causing the motor to work harder building up
heat in the motor compartment. At a set point, this heat build up causes the FBI to illuminate. It may take up to 2 minutes for the FBI
light to illuminate. If the airflow is not completely blocked off, the temperature may not reach the point needed to turn on the FBI light.
Additionally, if the bag has been filled with fluffy type material such as carpet fiber, the air flow may not be restricted enough to cause the
motor to build up heat.
To test the FBI system:
1. The air flow must be completely blocked off.
2. Place the tool activation dial/rotational valve handle to the tools "ON" position.
3. Blocking off the hose the FBI light should illuminate with in 2 minutes.
B.2. Bag is full but the FBI did not come "ON".
Check the bag for content. If the bag is full of carpet fiber or other fluffy material the air flow may not be restricted enough to cause the
motor to heat up and the light to illuminate.
B.3. Bag is not full and the FBI light is on.
The FBI light will illuminate if the pores of the HEPA bag become clogged with a fine powder type substance, such as drywall dust.
This is the most common reason for the light to illuminate.
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I. Common Issues