1. Full bag or canister
The most common cause. Empty or replace it first.
2. Dirty filter
A clogged filter chokes airflow. Clean or replace it as your manual describes.
3. A clog
If suction is weak at one inlet, the clog is likely in that branch. If it is weak everywhere, check the hose and the line near the unit.
4. An air leak
An inlet door that does not close, a worn seal, or a loose fitting at the unit.
5. A worn motor
Older motors lose power and get louder. If the checks above do not help, book a diagnosis.
Still weak?
Service calls start at $150 plus HST. That covers the visit and diagnosis. Any repair labour and parts are quoted before work goes ahead.