Refrigerator Making Clicking Noise
A clicking noise from a refrigerator is one of the most common complaints — and one of the most important to diagnose quickly. In many cases it's a harmless sound from the ice maker or defrost timer. But a repeated clicking every 3–5 minutes from the back of the fridge almost always means the compressor is trying and failing to start, most commonly due to a failed start relay. Left unaddressed, this leads to complete compressor failure. The good news: the start relay is a $10–20 part that takes 5 minutes to replace.
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Common Symptoms
- Clicking sound every 3–5 minutes, often from the back bottom of the refrigerator
- Refrigerator not cooling as well as usual
- Compressor humming briefly then clicking and stopping
- Clicking noise from inside the freezer section
- Ice maker making clicking or grinding sounds during a cycle
- Clicking that stops when ice maker arm is raised
Most Likely Causes
- 1
Failing Compressor Start Relay (Most Common)
The start relay is a small electrical component — about the size of a large marble — that plugs into the side of the compressor at the back of the refrigerator. It provides a starting boost of power to get the compressor motor spinning. When it fails, the compressor attempts to start, can't, and trips the overload protector — producing the characteristic click-hum-click cycle every few minutes. Diagnosis is simple: pull the relay off the compressor, shake it near your ear. A rattle means it's failed. A burned smell confirms it. Replace for $10–20. Common parts: W10613606 (Whirlpool/Maytag), 5304491452 (Frigidaire), DA35-00101K (Samsung), WR55X10025 (GE).
- 2
Overload Protector Tripping
The overload protector is a thermal/current protection device also mounted on the compressor. If the compressor draws too much current (often due to a bad start relay, worn compressor windings, or high ambient temperature), the overload trips and cuts power with a click. The compressor cools, the overload resets, and the cycle repeats. If replacing the start relay doesn't stop the clicking, the overload protector itself ($10–25) may need replacement — or the compressor is failing.
- 3
Ice Maker Cycling
During an ice-making cycle, the ice maker motor advances through several positions, sometimes producing clicking or ratcheting sounds. This is normal operation. If the ice maker arm (the wire sensor arm) is stuck in the down (on) position but the ice bin is full, the ice maker will keep cycling and clicking. Lift the arm to the up (off) position to test — if clicking stops, the ice maker is normal and just needs the bin emptied.
- 4
Condenser Fan Hitting Debris
The condenser fan at the back-bottom of the refrigerator cools the compressor and condenser coils. A piece of debris — a twist tie, paper, or hardened pet hair mat — can get caught in the fan blade, causing a rhythmic clicking or tapping as the blade strikes it. Locate the fan behind the kick plate or rear access panel. Clear any obstructions.
- 5
Evaporator Fan Hitting Ice Buildup
If ice has built up around the evaporator fan blades inside the freezer, the spinning blades scrape the ice and produce a loud clicking or scraping noise. This is a sign of defrost system failure — ice is building up when it should be melting. Manually defrost the unit (unplug 24–48 hours) and check whether the defrost heater or thermostat needs replacement.
- 6
Defrost Timer Clicking
Older refrigerators (pre-2000) use a mechanical defrost timer — a small motorized clock that clicks audibly as it advances through defrost cycles. One distinct click every 6–12 hours is normal. Continuous clicking or clicking that coincides with cooling problems indicates the timer has stuck and needs replacement. Modern refrigerators use an electronic adaptive defrost control that does not click.
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Quick DIY Checks
ALWAYS unplug the refrigerator before removing rear panels, touching the compressor, or accessing the condenser fan. The condenser fan blade is unguarded and can cause cuts. The compressor capacitors can retain a charge even after unplugging — wait 5 minutes before touching compressor terminals.
If the compressor is hot to the touch, the overload protector is tripping due to heat. Ensure the refrigerator has at least 2 inches of clearance on the sides and 1 inch at the top, and that condenser coils are clean. Running with restricted airflow shortens compressor life significantly.
- 1LOCATE THE SOUND: Stand next to the refrigerator and listen carefully. Clicking from the back-bottom (behind the kick plate or rear access panel) points to the compressor area — start relay or overload protector. Clicking from inside the freezer points to the evaporator fan or ice maker.
- 2START RELAY SHAKE TEST: Unplug the refrigerator. Pull the refrigerator away from the wall and remove the rear access panel (usually 4–6 screws). Locate the compressor — the large black dome-shaped unit. The start relay is a small rectangular box plugged into the side. Twist and pull it off. Shake it near your ear. If you hear a rattle or feel loose pieces inside, the relay has failed and needs replacement. Also smell it — a burned smell confirms failure.
- 3START RELAY MULTIMETER TEST: With the relay unplugged, set a multimeter to resistance (Ohms). Test between the two large terminals on the relay body. A functioning relay reads near 0 ohms (continuity). A failed relay reads OL (open). Replace if it reads OL or rattles.
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Try Pro — $7.99/mo- 4ICE MAKER CHECK: Open the freezer and locate the ice maker. Lift the wire shut-off arm to the raised (off) position. Wait 15–30 minutes and listen — if clicking stops completely, the ice maker was the source. This is normal cycling behavior. Empty the ice bin and lower the arm to resume normal operation.
- 5CONDENSER FAN INSPECTION: With the refrigerator unplugged, remove the rear access panel or kick plate. Locate the condenser fan (a small blade fan near the compressor). Manually spin the blade — it should spin freely with no obstruction. Clear any debris. Also check that the fan blade is not cracked or loose on the motor shaft.
- 6EVAPORATOR FAN ICE CHECK: If clicking is coming from inside the freezer, remove the freezer back panel (unplug first). Check if the evaporator fan blade is contacting ice buildup. If so, manually defrost (hair dryer on low, or unplug 24–48 hours) and then test the defrost system components to prevent recurrence.
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Repair vs Replace
A start relay replacement ($10–20) is one of the best-value appliance repairs possible. Overload protectors are $10–25. Condenser and evaporator fan motors are $30–80. If the compressor itself has failed (clicking persists after replacing relay and overload, compressor windings test bad), weigh the compressor replacement cost ($300–500 installed) against the unit's age. For units under 8 years old, compressor replacement may still be worthwhile. For units 12+ years old, a new refrigerator is often the better investment.
Est. Repair Cost
$10–$400 depending on root cause
Est. Replacement Cost
$800–$2,500 for a new refrigerator
Recommended Tools & Parts
- Buy on Amazon →
Compressor Start Relay
Small relay that plugs into the compressor side terminal. Shake to test — rattle means replace. Brand-specific: W10613606 (Whirlpool/Maytag), 5304491452 (Frigidaire), DA35-00101K (Samsung), WR55X10025 (GE).
$10–$25
- Buy on Amazon →
Overload Protector
Thermal/current protection device mounted on the compressor. Often sold with the start relay as a kit. Replace if relay alone doesn't stop clicking.
$10–$30
- Buy on Amazon →
Condenser Fan Motor
Cools the compressor and condenser coils. Replace if blade spins freely but motor doesn't run. Model-specific fit required.
$30–$70
- Buy on Amazon →
Evaporator Fan Motor
Located inside the freezer behind the back panel. Replace if blade contacts ice or motor has seized. Common: WR60X10307 (GE), WPW10189703 (Whirlpool).
$30–$80
- Buy on Amazon →
Digital Multimeter
Test start relay continuity, compressor winding resistance, and overload protector function. Essential diagnostic tool.
$15–$30
Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.
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Frequently Asked Questions
- Is a clicking refrigerator dangerous?
- A clicking start relay is not immediately dangerous, but it means the compressor is failing to start repeatedly — which will lead to food spoilage within 24–48 hours as the temperature rises. A burned start relay also has a slight odor but is not a fire hazard. Replace it promptly. A clicking noise from a condenser or evaporator fan is not dangerous but can damage the fan motor if the obstruction or ice is not cleared.
- I replaced the start relay and the clicking stopped, but my fridge still isn't cooling. What's wrong?
- If the relay replacement stopped the clicking but cooling hasn't restored, one of two things happened: (1) The compressor sustained damage from repeatedly failing to start — test the compressor windings with a multimeter (each winding terminal to ground should read OL, not continuity). (2) A refrigerant leak occurred — look for oily residue near the compressor or evaporator tubing. A refrigerant issue requires a licensed technician.
- How often should a refrigerator compressor click when starting?
- A healthy refrigerator compressor starts and runs for 10–30 minutes at a time, then cycles off. You might hear a single soft click as the start relay engages at startup — that's normal. Repeated clicking every 3–5 minutes, or clicking followed immediately by a loud clunk and silence, is abnormal and indicates the compressor is failing to start.