The short answer
The Criterion HQ refrigerator is a one-model family, and that changes how this symptom is diagnosed: there is no variant to rule out, so the fastest route is to sort the noise by when it happens rather than by which build you own. On these cabinets a warble or buzz that changes when the freezer door opens is the evaporator fan touching frost, and that single test settles most calls before a panel comes off.
What you observe
- A warble or buzz from inside the freezer that stops when the door opens — The door switch cuts the evaporator fan, so the noise stopping at the door is the fan naming itself.
- A rattle from the base at the back that comes and goes with the compressor — Condenser fan, a loose cover, or debris that has found its way into the machine compartment.
- A knock or thump a few seconds after the compressor starts or stops — Tubing or a mount transmitting movement into the cabinet and the floor.
- A hum that is felt through the cabinetry more than heard — A resonance path: the cabinet touching a wall or a unit, or feet not carrying the weight evenly.
- NEAR MISS — a periodic clatter followed by running water — That is an ice maker harvesting, which is normal, and the ice maker page covers the versions of it that are not.
Causes, most likely first on this family
- Evaporator fan blade contacting frost — First on this family. The freezer fan runs behind the rear panel where frost builds first, and the blade only has to touch it to produce a noise loud enough to be heard through a closed door.
- Condenser fan or debris in the machine compartment — Second. The base is open to the room, so lint and pet hair collect around the fan and the noise follows the compressor rather than the doors.
- Compressor mounts and tubing contact — Third: a knock on start and stop rather than a continuous sound, and it grows as rubber mounts age.
- Cabinet resonance from levelling or a tight opening — Last as a cause, but first to rule out, because it costs nothing and it changes a hum that sounds structural into one that is not.
Check in this order, and why
- Open the freezer door with the noise running — The door switch cuts the evaporator fan, so a noise that stops is that fan and a noise that continues is not. This is the first move on a fixed-layout family because nothing has to be confirmed before it.
- Listen at the base at the rear while the compressor runs — Separates condenser fan and debris from anything inside the cabinet.
- Rock the cabinet gently and push it against the opening — A hum that changes with pressure is resonance, not a component.
- Only then remove the freezer rear panel — Do this last because it is the one step that needs the machine isolated and emptied, and the three tests above usually make it unnecessary.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel; a capacitor can hold a charge after the power is off, and a fan is the one thing in the cabinet that restarts without warning. Keep fingers clear of the condenser fan blade at the base even with the doors open, and get a second person for any move: these cabinets are front-heavy once the doors swing.
Models in the HQ family
Reference| Model number | Family key |
|---|---|
| HQ-827WEN(UR-BCD636WE-ST) | criterion:refrigerator:hq |
When to call a technician
Levelling, clearing debris from the base and letting frost melt are owner work here. Call once the noise is behind the freezer rear panel — that panel comes off over the defrost heater and the evaporator tubing — or if a knock comes with a cabinet no longer holding temperature. Call at once for a screech from the compressor or a smell of hot insulation.
Nearest pages of this class
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