Sub-Zero refrigerators are well built appliances, they are reliable and a popular manufacturer. If you have one that’s gone wrong sometimes all it takes to get it up and going again properly is a little bit troubleshooting and DIY handiness.

Below are 5 common Sub-Zero refrigerator faults and some fast solutions.

1. Refrigerator Not Cooling Properly

Possible Causes: Dirty condenser coils, malfunctioning evaporator fan, or a refrigerant leak.

DIY Fixes

Cleaning Condenser Coils: Dust and debris can block airflow and reduce cooling performance.

• Tools Needed:
  • Coil Brush
  • Vacuum Cleaner
• DIY Cost: $10–$25.
• Time: 30–45 minutes.
• Potential Savings: $70–$130 compared to professional cleaning.

Replacing Evaporator Fan: If the cooling issue persists, the evaporator fan may be defective.

• Tools Needed:
  • Screwdriver Set
  • Multimeter
• DIY Cost: $50–$150 for the fan motor.
• Time: 1–2 hours.
• Potential Savings: $150–$250.

Buy this part cheaper than new: Sub-Zero Evaporator Fan Motor.

2. Water Leaking from Refrigerator

Possible Causes: A damaged water inlet valve or a clogged defrost drain.

DIY Fixes

Replacing the Water Inlet Valve: Leaks are commonly caused by a malfunctioning inlet valve.

• Tools Needed:
  • Adjustable Wrench
  • Pliers
• DIY Cost: $30–$100 for the valve.
• Time: 1 hour.
• Potential Savings: Up to $200.

Buy this part cheaper than new: Sub-Zero Water Inlet Valve.

Clearing the Defrost Drain: A clogged defrost drain can cause water to pool inside the fridge.

• Tools Needed:
  • Pipe Cleaner
  • Warm Water
• DIY Cost: Minimal.
• Time: 20–30 minutes.

3. Ice Maker Not Working

Possible Causes: A clogged water line or a faulty ice maker motor.

DIY Fixes

Replacing the Water Line: If the ice maker isn’t filling with water, a blocked water line may be the issue.

• Tools Needed:
  • Tube Cutter
  • Pliers
• DIY Cost: $12–$50 for the water line.
• Time: 1–2 hours.
• Potential Savings: Up to $400.

Buy this part cheaper than new: Sub-Zero Water Line.

Replacing the Ice Maker Motor: A malfunctioning ice maker motor can prevent ice production.

• Tools Needed:
  • Screwdriver Set
  • Pliers
• DIY Cost: $100–$250 for the motor.
• Time: 1–2 hours.
• Potential Savings: Up to $350.

Buy this part cheaper than new: Sub-Zero Ice Maker Motor.

4. Excessive Frost in the Freezer

Possible Causes: Faulty defrost heater or defrost timer.

DIY Fixes

Replacing the Defrost Heater: If your freezer has too much frost, the defrost heater may be failing.

• Tools Needed:
  • Multimeter
  • Screwdriver Set
• DIY Cost: $50–$150 for the heater.
• Time: 1–2 hours.
• Potential Savings: Up to $250.

Buy this part cheaper than new: Sub-Zero Defrost Heater.

5. Noisy Refrigerator

Possible Causes: Noise is often due to a failing condenser fan motor or evaporator fan.

DIY Fixes

Replacing the Condenser Fan Motor: If your fridge is making loud noises, the condenser fan motor might need replacing.

• Tools Needed:
  • Screwdriver Set
  • Pliers
• DIY Cost: $50–$150 for the condenser fan motor.
• Time: 1–2 hours.
• Potential Savings: Up to $200.

Buy this part cheaper than new: Sub-Zero Condenser Fan Motor.

How Much Can You Save with DIY Repairs?

By handling these repairs yourself, you can save a significant amount of money. Here’s a quick breakdown:

• Professional Repair Costs: $125–$1,400 depending on the issue.
• DIY Repair Costs: $10–$550 for parts and tools + the time involved to complete the job.
• Potential Savings: Up to $900 for a longer and more complex repair that requires labour, expertise and parts.

When to Call a Professional

Some issues, such as refrigerant leaks, compressor problems, or complex electrical faults, require professional attention. If you’re unsure or face a major issue, it’s best to consult a professional repair service. For expert Sub-Zero refrigerator repairs, Contact Manhattan Appliance Repair.