In short
A refrigerator that has started making a noise is usually rattling rather than dying. The ranking here puts defrost heater sizzle and expansion clicks first, and the compressor near the bottom, because compressors rarely announce themselves.
What you observe
- A ticking or chirping from inside the freezer — Something is touching the evaporator fan blade — usually frost.
- A buzz or hum from the bottom rear that comes and goes — The condenser fan or the compressor, and the timing tells you which.
- A rattle that stops if you press on the cabinet — Panel, tray or tubing resonance rather than a component fault.
- NEAR MISS — noisy and also not cooling — Then noise is the symptom and cooling is the fault; the cooling-failure page ranks it properly.
Causes, most likely first on a Simplex refrigerator
- Defrost heater sizzle and expansion clicks — These sounds arrive a few times a day, last a few minutes, and then stop on their own. Ranked first on a Simplex refrigerator: the sounds are scheduled rather than continuous, which is the clue that they are normal.
- Evaporator fan blade catching frost or a worn fan bearing — The fan sits behind the freezer rear panel; frost growing onto the blade makes a tick that rises with the fan.
- Ice maker filling, harvesting or running dry — An ice maker with no water supply cycles anyway, so it buzzes and clunks to no purpose.
- Condenser fan hitting dust, a bag or a stray object — The condenser fan lives underneath or at the back, where light debris collects and gets drawn in.
Check in this order, and why
- Time the noise: does it come in short episodes a few times a day? — Episodic noise a few times a day is a defrost cycle doing its job.
- Open the freezer and press the door switch in: does the noise start with the fan? — A noise that begins and ends with the fan is the fan or what it is touching.
- Switch the ice maker off for a day and see whether the noise goes with it — A noise that disappears with the ice maker off is answered.
What an owner can safely check
- Hold the door switch in and listen at the freezer rear panel, then release it and listen again — A noise that tracks the fan exactly is the fan; one that carries on is behind or below the cabinet.
About 10 min
- Turn the ice maker off at its switch or arm for a day and listen — If the noise goes with it, the ice maker is the source; if the bin is empty as well, the water supply is the real fault.
About 10 min
- STOP HERE if the next check needs a panel off or a meter on live terminals — That is where the owner checks end and a service call begins, whatever the ranking says.
Before you open anything
Safety
Disconnect power at the plug or the breaker before opening anything, and give a capacitor time to bleed down before you reach past a board. Nothing sharp goes near an iced evaporator: thin tubing, refrigerant under pressure, no home repair. Refrigerant work is licensed work, so the sealed system is where the owner job ends. Empty the cabinet before you move it.
When to call a technician
Call when the noise is a grinding that worsens, when it tracks the compressor exactly and the mounts look sound, or when a fan is clearly the source and it is behind a panel. A noise alone is rarely urgent; a noise with warmth in the cabinet is. Age is the deciding factor: if the machine is old enough that the control board is the suspect, price the board against a replacement machine before agreeing to the work.
Nearest pages of this class
What this page does not cover
This is the generalised Simplex refrigerator page. A family- or model-specific page, where one exists, is linked above and is the more precise answer for your unit. Left out on purpose: part numbers, connector colours, the order panels come off in, and every torque figure — a generalised page cannot be right about any of them.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
