The short answer
Start with a small cabinet with nothing to absorb vibration: on Nova refrigerators it outranks the evaporator fan catching ice, and both come a long way before the ice maker and its fill valve. On a compact import-channel unit the surroundings come first. There is very little mass and very little margin in these machines, so where one stands changes how it behaves. Most of what follows is owner-checkable, and the point where that stops is stated plainly below.
What you observe
- A humming that has become noticeably louder — A compressor working harder than it used to, usually because it is running far more of the time.
- A loud buzz for a few seconds, then silence — The water valve filling an ice maker, which does this on a schedule whether or not it makes ice.
- The noise stops when you open the freezer door — Almost conclusive: most machines stop the evaporator fan on a door switch, so the noise is that fan.
- NEAR MISS — noise only when the ice maker runs — The fill valve and the harvest cycle are both loud by design. Nothing on this page applies to them.
Causes, most likely first on Nova
- A small cabinet with nothing to absorb vibration — A compact unit has a full-size compressor hum in a cabinet with a fraction of the mass to absorb it. Standing on a shelf, a worktop, a desk or a carpeted floor, it will transmit far more noise than its size suggests. Ranked first on Nova: on a compact unit the surface underneath leads, because there is no mass in the cabinet to damp anything.
- The evaporator fan catching ice — Behind the rear panel of the freezer a fan pushes cold air through the whole cabinet. Second: the door test separates it from everything else in seconds, and it is the noise most likely to be telling you about a second fault behind it.
- The compressor and its mounting grommets — A compressor that has become loud is usually either poorly isolated or running far more than it used to. Third on this brand: this placement keeps an expensive conclusion below the cheap ones that explain the same sound.
- The ice maker and its fill valve — An ice maker is a noisy device by design: the valve buzzes as it fills, the mould heats and releases, and the cubes drop into a bin that acts as a drum. Last: this ranks where it does because the noise is loud, alarming and almost always working as designed.
Check in this order, and why
- First: Move it to a different surface — A unit that goes quiet on a solid floor has named its support rather than its parts. It is first because it is the cheapest of the three to settle.
- Second: Open the freezer door while it is noisy — If the noise stops the instant the door opens, it is the evaporator fan and nothing else.
- Third: Has it become louder, or is it running more? — A unit that is simply running much more of the time is a cooling question, not a noise one.
What an owner can safely check
- Stand the unit on a solid, level surface — Move it off any hollow shelf or worktop, level it, and listen again after it has run for an hour.
About 20 min
- Listen at the freezer with the door open and closed — Note whether the noise stops with the door open. Do not force the rear panel off.
About 10 min
- STOP HERE if the next step needs a meter on live terminals — That is the line between an owner check and a service call, and it is not worth crossing.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel, and treat every capacitor as still charged: a capacitor can hold a charge after the power is off. Secure or remove the doors before moving a unit, get help with the lift, and never lay a refrigerator on its back. Do not put a heat gun anywhere near a cabinet full of plastic.
When to call a technician
Everything above that is done with a vacuum, a torch and a spanner is owner work. Past that, the panels come off and the unit has to be isolated first.
Nearest pages of this class
What this page does not cover
This is generalized information for Nova refrigerators as a class, not for one family or one model. No family- or model-specific page for this brand and appliance is published here yet, so nothing narrower is linked; when one is, it becomes the more specific answer and this page will point to it. Not here: wiring colours, torque figures, part numbers and panel-removal sequences, all of which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
