Cordless vacuum display shows E7, unit powers but suction is very weak or cuts out under load

Safety first: Remove the battery and dust bin before opening any covers. Do not touch motor terminals with the battery connected.

Basic checks:

• Ensure filters and airflow are clear: A heavily restricted airflow can cause the control board to misinterpret motor speed. Clean filters and check for blockages first.
• Inspect for burning smell or noise: If the motor makes a burning smell, rattling, or grinding noise, discontinue use; the motor is likely failing.
• Check visible wiring: If you are comfortable removing the outer shell (and this does not void warranty), inspect the motor wiring harness for loose plugs or obvious damage. Reseat connectors firmly.

Note: Tachometer sensors and main motors in Hoover cordless vacuums are not typically repairable at component level. If E7 remains after airflow checks, the main motor assembly or main PCB will need replacement by a qualified service technician.