Kenmore Refrigerator: not heating

Professional Repair Guide

What is this symptom?

Experiencing issues with your Kenmore refrigerator not heating? This can lead to frost buildup on the evaporator coils, affecting cooling performance. The defrost heater may not be activating, causing these problems. Understanding the potential causes and solutions can help restore optimal functionality.

Urgency: Medium

Important Tips for Kenmore Models

  • Kenmore defrost systems use defrost heater, thermostat, and timer or control board combination; these specific parts are identified for replacement in Kenmore models

Possible Causes

Defrost heater assembly failure

How to Identify: Frost or ice buildup on the evaporator coils and no sign of heat during defrost cycle; continuity test of heater shows open circuit.

Part: Defrost heater

Defrost thermostat failure

How to Identify: Thermostat fails to close contacts at low temperatures, preventing power to heater; continuity test at cold readings shows no continuity.

Part: Defrost thermostat

Defrost timer or control board failure

How to Identify: No initiating of defrost cycle; timer doesn’t advance or control board fails to power heater.

Part: Defrost timer / Defrost control board

Faulty thermistor/temperature sensor in defrost circuit

How to Identify: Sensor doesn’t signal correct evaporator temp; heater not activated though heater and timer are good; continuity tests inconsistent with expected values.

Part: Thermistor/defrost temperature sensor

DIY Solutions

Test defrost heater with multimeter

Moderate 30–60 minutes
Tools Needed: multimeter, screwdriver set, gloves
  1. Unplug refrigerator and remove freezer back panel to access evaporator coils.
  2. Locate defrost heater element and disconnect wires.
  3. Set multimeter to ohms and test continuity across heater leads.
  4. If meter shows open (no continuity), heater is defective and needs replacement.
⚠️ Safety First: Always unplug refrigerator before accessing internal components.

Inspect defrost thermostat and continuity

Moderate 30–60 minutes
Tools Needed: multimeter, screwdriver set
  1. Access defrost thermostat near evaporator coils.
  2. With fridge unplugged and thermostat at low temp, test for continuity across terminals.
  3. If thermostat shows no continuity at proper temperature, replace thermostat.
⚠️ Safety First: Disconnect power before testing.

Professional Repairs

Replace defrost timer or electronic control board

Estimated Cost: $100–$350

Replace thermistor/temperature sensor

Estimated Cost: $25–$80

When to Call a Professional

If replacement of internal electronic parts like control board or timer is needed
When you’re unsure about safely handling electrical components or access inside freezer
If multiple parts (heater, thermostat, sensor) fail tests

Preventive Maintenance

  • Clean condenser coils: Improves overall cooling efficiency and reduces strain on defrost system components
    Frequency: every 6 months
  • Check door seals: Cold air loss that can complicate frost buildup and defrost cycles
    Frequency: every 3 months

Frequently Asked Questions

Why is my Kenmore Refrigerator not heating?
Common causes include defrost heater failure, a faulty defrost thermostat, or issues with the defrost timer.
How do I fix Kenmore Refrigerator not heating myself?
Test the defrost heater and thermostat with a multimeter for continuity. Replace if faulty.
How much does it cost to fix not heating?
Professional repair costs range from $100 to $350 for timer or control board replacement.
When should I call a technician for not heating?
If DIY troubleshooting doesn't resolve the issue or if you lack the tools, consider calling a technician.

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

70%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Faulty thermostat preventing the heater from activating
  • Defective heater element that is not functioning
  • Wiring issues or loose connections affecting power to the heater

User Suggested Solutions

  1. Check and replace the thermostat if faulty. Disconnect power, access the thermostat, and test for continuity. Replace if necessary.

  2. Inspect the heater element for damage. Disconnect power, remove the heater, and test with a multimeter. Replace if defective.

  3. Examine wiring and connections for damage or looseness. Secure any loose connections and replace any damaged wires.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Need help - refrigerator heater kit install

Community Discussions

trying to install a heater kit

Heater kit should be connected to the thermostat terminals.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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