Diagnostics

Researched from published specifications and owner reported figures

Quick answer

Most vacuums that get replaced are working machines with a blocked filter, a stretched belt, a worn brush roll or a tired battery. These five checks take about half an hour between them, cost nothing to run, and end at a specific part rather than at a new vacuum.

The parts these checks usually end at

Why a checking order beats a guess

Every one of these symptoms has several possible causes, and they are not equally likely or equally expensive to rule out. A blocked filter and a failed motor produce the same complaint, so working from cheapest and most likely outwards is what stops an afternoon disappearing into the wrong repair.

The order also matters because a restriction upstream makes every test downstream of it misleading. A machine with a loaded filter has poor airflow everywhere, so checking the brush roll first tells you very little. Clear the airway, then judge the parts.

Common questions

Do these tools test my vacuum?

They tell you what to test and in what order. The measurements are ones you take on your own machine, such as timing a battery from full to cutoff or measuring bristle length against a straight edge. Nothing here reports a test we performed, because this site has not tested a vacuum and does not claim to have done.

Which one should I start with?

Suction loss triage, if the machine has stopped picking up properly. It covers the whole airway from the floor head to the exhaust and it puts the cheapest and most likely causes first, so most people find the answer within the first three steps and without buying anything at all.

Do I need tools to do any of this?

A screwdriver and a ruler cover almost all of it. A coin is the standard test for a blocked hose, a straight edge tells you whether a brush roll is worn, and a kitchen timer is all a battery test needs. The one job that benefits from anything more is fitting a belt, and even that is usually finger work.

Is it worth fixing an old vacuum at all?

Often, yes, and the repair or replace tool exists to work that out with actual numbers rather than a hunch. Filters, bags, belts, brush rolls, batteries and hoses are owner replaceable on almost every household machine, and between them they account for the clear majority of vacuums that are thrown away while fundamentally sound.

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About this page

Every figure here comes from published manufacturer specifications, owner reported measurements and repair documentation, and each is labelled as either a standard or a convention. This is researched general information to help you diagnose and plan, not professional advice, and it cannot tell you what is wrong with one particular machine. Your own manual and the part number printed on your machine are the final word.