The short answer
Noise from the MCD family is usually one of three rotating parts or the cabinet itself resonating, and which one it is can be told from where and when the noise happens. That ordering is specific to how this platform is built and it is not the order the brand-generic page uses.
What you observe
- A rattle against the wall or a cabinet side — The unit is transmitting normal vibration into the surroundings and needs clearance, not repair.
- Clicking or a repeated tick every few minutes — A start relay or a defrost timer, and the interval is the clue.
- A gurgle or trickle after the unit stops — Refrigerant settling. It is normal and needs nothing done about it.
- A bang or crack from inside the cabinet — Plastic liner expanding and contracting through a defrost cycle, which is normal on most cabinets.
- NEAR MISS - noise plus a cabinet that is warming — Read the cooling page as well; a noisy fan that is failing takes the cooling with it.
Causes, most likely first on MCD
- Circulation fan blade fouled by frost or an item — Ranked first on the MCD family: the single fan sits very close to the shelving on a compact unit, so any loose item finds it. What decides the order here is where the cold has to travel, and that is fixed for every model in the family. What moves against the brand-generic order is lower down: condenser fan or a loose fan shroud sits above start relay, defrost timer or a solenoid clicking here, because the family spans several sizes on one platform and it is the shared parts that wear.
- Cabinet contact and levelling — Second: a light compact unit walks on its feet and buzzes against whatever it is touching.
- Condenser fan or a loose fan shroud — Third: the coil is often exposed at the back of this class of unit, so anything resting against it rattles.
- Start relay, defrost timer or a solenoid clicking — Fourth: a regular tick at a long, steady interval is a control device operating, and recognising it saves an unnecessary call-out.
- Compressor mounts or compressor wear — Last: last, and on a compact unit it is usually the end of the unit rather than a repair.
Check in this order, and why
- Open the door and listen for the noise to stop — The circulation fan is switched by the door, so this splits the fault in one move.
- Empty the cabinet and run it briefly — It rules out packages resting against the rear wall, which is a common and free finding.
- Time the noise against the compressor cycle — Noise that begins and ends with the compressor is a different fault from noise that runs constantly.
- Look behind the rear panel for frost touching the fan — Do this last, because it needs the cabinet emptied to see properly.
Before you open anything
Safety
Power off before opening anything, and clear ice by letting it melt. A blade against a cold surface punctures an evaporator and ends the appliance on the spot.
When to call a technician
Call once the unit is level, clear of its surroundings and the noise persists from inside, because a fan or a relay change on this family means a panel comes off with the cabinet live.
Other MCD pages
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