Whirlpool Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator MECH-TEMP-FLUCT Error Fix: Temperature Fluctuations

Error code MECH-TEMP-FLUCT on the Whirlpool Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator means: Temperature Fluctuations. The refrigerator or freezer temperature fluctuates — too warm at times, then too cold. Check: (1) Door gasket seal — warm air entering causes the compressor to work harder and can cause freeze/thaw cycles. (2) Temperature sensor (thermistor) — if the sensor is intermittently failing, it sends inaccurate readings. Test resistance with a multimeter. (3) Damper control — the air damper between the freezer and refrigerator compartments may be stuck or malfunctioning, sending too much or too little cold air to the fridge section. (4) Condenser coils — dirty coils cause the compressor to cycle off on overload, then restart when it cools down.

The most successful fix is "Test and Replace the Temperature Sensor (Thermistor)" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Test and Replace the Temperature Sensor (Thermistor)") is rated medium difficulty and takes about 45 minutes. Tools needed: Phillips screwdriver, Digital multimeter.

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Whirlpool Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator has 8 other known error codes, including: 1 (Defrost Bimetal/Thermostat Failure), 2 (Defrost Heater Failure), 3 (Defrost Timer/Board Failure), CF (Communication Fault), MECH-COMPRESSOR (Compressor Click-and-Buzz Failure), and 3 more.

Error code MECH-TEMP-FLUCT also appears on 2 other Whirlpool models: Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator, Whirlpool WRS331SDHM 21 cu. ft. Side-by-Side Refrigerator. The fix may vary by model, so check each model's specific page for tailored repair steps.