1418409 Defrost Sensor – Frost Buildup or Fridge Not Cooling? This Sensor Is Usually Why
Is This the Part You Need?
If your Hisense refrigerator has excessive frost buildup in the freezer, is not cooling properly, or the defrost cycle isn’t running, the defrost sensor (thermistor) is a primary suspect. Part 1418409 (also listed as K1418409) is the genuine OEM defrost sensor for Hisense refrigerators. It monitors evaporator temperature and signals the control board to initiate and terminate the defrost cycle. When it fails, frost accumulates unchecked and cooling performance drops.
Symptoms This Part Fixes
- Excessive frost or ice buildup on the freezer evaporator coils
- Refrigerator not cooling or running warmer than set temperature
- Freezer section frosting over completely
- Defrost cycle not running or running continuously
- Fan blocked by ice buildup causing reduced airflow
- Error codes related to defrost or temperature sensor faults
Part Details
- OEM Part Number: 1418409 (K1418409)
- Part Type: Refrigerator Defrost Sensor / Thermistor
- Compatible Brands: Hisense (verify by model number)
- Fit: Direct OEM replacement — no modification required
- Repair Difficulty: Beginner–Intermediate (2/5)
Installation Notes
- Skill Level: Beginner–Intermediate — freezer panel access required
- Disconnect power at the wall outlet or breaker before starting
- Remove freezer contents and any ice buildup from the evaporator cover panel
- Unclip the sensor from the evaporator coils and disconnect the wire harness
- Clip the new sensor into position on the evaporator and reconnect the harness
- Reassemble the panel, restore power, and allow 24 hours for temperatures to stabilize
Compatible Models
HR6BMFF520D, HR6BMFF520SD. Contact us to confirm your model.
💡 Pro Tip — Check the Defrost Heater and Defrost Timer Too:
The defrost system has three components that work together: the defrost sensor, the defrost heater, and the defrost timer/control. If the sensor tests good but frost buildup continues, the heater or timer is the next suspect. Test the heater for continuity with a multimeter — an open circuit means it’s failed. Replacing all three during the same service call is inexpensive and eliminates the most common defrost system failures in one visit.
The defrost system has three components that work together: the defrost sensor, the defrost heater, and the defrost timer/control. If the sensor tests good but frost buildup continues, the heater or timer is the next suspect. Test the heater for continuity with a multimeter — an open circuit means it’s failed. Replacing all three during the same service call is inexpensive and eliminates the most common defrost system failures in one visit.
✓ Model-Specific Repair Pages
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
Buy Online Pick Up In-Store
Address
101 Trillium Dr
Kitchener, Ontario N2E 1W8
Kitchener, Ontario N2E 1W8
Phone
Hours
Mon–Fri 9 AM–5 PM • Sat 9 AM–1 PM
- Choosing a selection results in a full page refresh.
PayPal Pay Later Messaging
Step 1: Choose message placement
Click the button below and then hover over your page to select a placement.
