Kitchenaid Refrigerator: not defrosting

Possible Causes

Faulty defrost timer

How to Identify: No automatic defrost cycle occurs; turning defrost timer manually does not activate heater or advance cycle

Part: Defrost timer

Defective defrost control board

How to Identify: Defrost cycle not initiated despite correct signals from thermostat/heater tests

Part: Defrost control board

Bad defrost heater assembly

How to Identify: Frost persists on coils; heater fails continuity check with multimeter

Part: Defrost heater

Faulty defrost thermostat

How to Identify: Thermostat fails continuity at low temps; heater doesn’t receive power

Part: Defrost thermostat

Clogged defrost drain

How to Identify: Water accumulates or freezes rather than draining; ice buildup persists

Part: Defrost drain

Evaporator fan or circulation issues

How to Identify: Frost buildup and poor airflow; fan doesn’t run or is noisy

Part: Evaporator fan motor

DIY Solutions

Test defrost timer

Moderate 15–30 minutes

Tools Needed: screwdriver, multimeter

1. Unplug refrigerator and access timer (control panel/front grille)
2. Slowly turn timer dial into defrost; listen for click and heater operation; test continuity with multimeter
3. Replace timer if it does not advance or power defrost heater

⚠️ Safety First: Always unplug before accessing components

Check and clean defrost drain

Easy 15–30 minutes

Tools Needed: warm water, pipe cleaner or soft brush

1. Locate defrost drain at freezer base
2. Flush with warm water and clear debris with soft tool
3. Ensure water drains to pan below refrigerator

⚠️ Safety First: Do not use sharp metal tools

Professional Repairs

Replace defrost heater

Estimated Cost: $50–$150

Replace defrost control board

Estimated Cost: $100–$300

Replace defrost thermostat

Estimated Cost: $20–$80

When to Call a Professional

Electrical testing of defrost components beyond DIY comfort

Refrigerator still not defrosting after testing timer, heater, thermostat

Control board replacement required

Preventive Maintenance

• Regularly inspect and clear defrost drain: Drain clogs and ice buildup
  Frequency: annually
• Clean condenser and ensure proper airflow: Excess frost and cooling inefficiency
  Frequency: semi-annually

Frequently Asked Questions

Why is my KitchenAid Refrigerator not defrosting?

Common causes include a faulty defrost timer, defrost control board, or heater assembly.

How do I fix KitchenAid Refrigerator not defrosting myself?

Test the defrost timer and clean the defrost drain to resolve the issue.

How much does it cost to fix not defrosting?

Professional repairs can range from $20 to $300 depending on the issue.

When should I call a technician for not defrosting?

If DIY solutions don't work or if you're unsure about the repairs, call a technician.

Can I Fix This Myself?

100%

DIY Success Rate Difficulty: DIY

Common Issues Reported by Users

• Defrost bimetal failure (1 mentions)

User Suggested Solutions

1. Replace the defrost bimetal

   Success rate: 50.0%

Community Discussions

freezer building ice, temperature won’t stay cold, defroster not turning on

Replace the defrost bimetal, which is likely the issue.

DIY View on Reddit →

Source: Reddit r/appliancerepair