The short answer
On the CBMR family the usual reason a Criterion refrigerator is making an unfamiliar noise is ice maker fill, harvest and drop, and that is where the order below departs from the brand-generic article one level up: on the through-door dispenser build it outranks compressor mounts and running hum. The check that confirms which build you have is simple — look at the door: a water or ice outlet in the door means an ice maker and a fill line are part of the noise picture. Everything in front of the freezer rear panel — levelling, clearing, seating the pan — is owner work; what sits behind that panel is not.
What you observe on these models
- A buzz or rattle that starts and stops with the cooling cycle — It tracks the compressor exactly, which puts it in the machine compartment.
- Single sharp cracks separated by long silences — Expansion and contraction around the defrost cycle. Normal on a frost-free cabinet.
- A gurgle or hiss that fades as the cooling stops — Refrigerant moving. It becomes a fault only when a tube is touching the cabinet.
- A whirring or ticking that stops when the door is opened — The door switch cuts the cabinet fan, so this places the noise inside the food compartment.
- A clatter from the freezer at intervals with no pattern — Ice dropping into the bin, which surprises people most at night.
- NEAR MISS — the noise comes with a cabinet that is no longer cold — Noise plus warmth is a cooling fault, not a noise fault, and the cooling page is the right one.
Causes, most likely first on the CBMR family
- Ice maker fill, harvest and drop — Ranked first here: it ranks first on a cabinet with a dispenser because it is the noisiest thing in the appliance and it runs on its own schedule, so the owner rarely connects the sound to the event that caused it.
- Compressor mounts and running hum — Second: a compressor that is genuinely failing usually announces itself with a repeated attempt to start rather than with a hum, which is why a steady drone ranks as a mounting question first and a component question much later.
- Water inlet valve and pipe hammer at fill — Third: the pattern is one short thump, separated by hours, always following the fill buzz.
- Evaporator fan blade catching frost or its shroud — Fourth: this is the part that produces a noise which is loudest with the door shut and silent with it open.
- Refrigerant flow and tubing touching the cabinet — Fifth: the separation is simple: flow noise follows the compressor cycle and fades with it, while a mechanical noise keeps a constant character throughout.
- Drain pan or drip tray rattling on its rails — Sixth: this is the classic loud-but-harmless noise: a plastic pan resonating over a warm compressor.
Check in this order, and why
- Switch the ice maker off for a day — If the noise disappears with it, the cycle was the source and the appliance is healthy.
- Put a hand flat on the cabinet side while it runs — A drone you can feel as much as hear points at mounts and floor coupling rather than a part.
- Listen for a thump that follows a fill buzz — That sequence puts the noise in the plumbing, not in the appliance.
Before you open anything
Safety
Isolate the appliance at the plug or the breaker before opening anything, and treat the capacitor as live for a minute after. The door interlock stays connected, always: it stops the fan when the door opens and that is the whole point of it. Stop at once if you see oil at the compressor or the tubing, because the sealed system is open and that is licensed work. Moving a loaded cabinet is a two-person job on a tall unit.
Models in the CBMR family
Reference| Model number | Family key |
|---|---|
| CBMR187*#* | criterion:refrigerator:cbmr |
| CBMR187*** | criterion:refrigerator:cbmr |
| CBMR187M4* | criterion:refrigerator:cbmr |
When to call a technician
The line is the panel. Levelling, clearing the compartment, seating the pan and silencing the ice maker are all owner work; anything that requires the freezer rear panel off, or a meter on a fan motor, is not.
