Grinding Noise Then Shutdown: Fan Motor Bearings Worn Out

Some repairs are worth doing on any unit, and some depend on the life left around the failed part. That is the whole decision here.

By Team Snowflake | Updated 24 Aug 2026

Teaching case based on recurring Snowflake service patterns; identifying details are combined.

How this presents

Grinding that gets worse by the week, with the fan dropping out completely and restarting a few minutes later. The unit is well past a decade old. Cooling still happens when the fan runs, which makes the pattern easy to live with and easy to ignore.

Setup: Sharp Wall-mountedOver 15 yearsHDBWoodlands
Misread as: An expensive repair on an ageing unit, followed by the next failure soon after it.
Check first: The motor turned on its own once the wheel is off, then the part price and lead time

What else produces this

Grinding with intermittent stopping is a bearing, and confirming it takes one hand and no instruments: the wheel comes off and the motor is turned on its own. What matters more is that the answer arrives early, because it leaves the whole visit for the question that is actually hard. On a unit this age the diagnosis is cheap and the decision is not.

A motor running in fits, grinding audibly on every restart, describes bearings rather than supply.
Turning the motor alone by hand, feeling it seize and catch, confirms it without any test gear.
A wheel and blower intact, with no damage or wobble, removes the cheaper explanation entirely.
An age past the usual service life for this type puts the repair against a replacement rather than against nothing.

Why it happens

Bearings wear by running, and a unit that has run daily for over a decade has used most of what they had. Worn surfaces drag, the motor seizes in short bursts, and the fan cuts in and out as it does. Nothing has been neglected and nothing was avoidable. This is the failure a motor is expected to reach eventually, arriving at roughly the time expected.

What resolution involves

Both figures, honestly. A matched motor for this brand is not held locally and has to be brought in, so the wait is real and the price sits high against a unit of this age. Replacing the whole machine costs more at the counter and resets everything in it. Neither answer is automatic, and the right one turns on how long the room is expected to be cooled and by whom.

How to tell it worked

The part price and the lead time, both, before either path is agreed. A repair quoted without them is a decision made on incomplete information, and the waiting is often what changes the answer.

Before you approve a quote

A worn motor on an old unit is an arithmetic problem

Grinding with intermittent stopping is a bearing. That part is quick and rarely in doubt.
Ask for the part price and the lead time. On an uncommon model both can be worse than the repair suggests.
Past the usual service life, a repair competes with a replacement rather than with doing nothing.

Questions this case answers

Grinding noise from the aircon and the fan keeps stopping: what is failing?

Worn bearings in the fan motor. They drag as they wear, which makes the grinding, and the drag periodically stalls the motor outright, which is why the fan drops out and comes back. It is a wear failure rather than something that was neglected.

Can worn fan motor bearings be greased instead of replaced?

No. Sealed bearings cannot be re-greased usefully, and by the time they grind the surfaces themselves have gone. Anything applied externally quietens it briefly and changes nothing about the remaining life.

Is it worth repairing an aircon that is past twelve years old?

It depends on the part price and the wait, not on the age alone. Where a motor is common and cheap, a repair on a thirteen-year-old unit can be sensible. Where it has to be brought in at a high price, the same repair competes directly with a new machine.

What happens if a replacement part has to be sourced from overseas?

The wait becomes part of the decision rather than a detail of it. A week or more without cooling has a cost, and on an uncommon model that delay plus the part price is often what tips an otherwise reasonable repair toward replacement.

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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.

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