The Difference Between Sealed System and Non-Sealed System Parts

The Difference Between Sealed System and Non-Sealed System Parts

If you’ve ever needed refrigerator repairs or read a parts list, you might have come across the term “sealed system” and wondered what it means. Understanding the difference between sealed and non-sealed system parts can help you make better repair decisions — and even save money.

Let’s break it down in simple terms.

🔒 What Is a Sealed System?

A sealed system refers to the closed refrigeration loop inside appliances like refrigerators, freezers, and some air conditioners. It contains refrigerant gas that moves through coils to absorb and release heat.

Common sealed system components:

  • Compressor

  • Condenser coil

  • Evaporator coil

  • Capillary tube or expansion valve

  • Filter-drier

  • Refrigerant (usually Freon)

🧯 These components are “sealed” because the system must remain airtight to function properly. If any part leaks or is damaged, refrigerant escapes and the whole cooling process breaks down.

🔧 What Are Non-Sealed System Parts?

Non-sealed system parts are components outside of the refrigeration loop. These parts may assist in cooling or are part of other functions like airflow, lighting, control, and operation.

Common non-sealed system parts:

  • Thermostats

  • Fans (evaporator or condenser)

  • Temperature sensors

  • Light bulbs

  • Door gaskets

  • Defrost heaters

  • Control boards and timers

💡 These are often easier and more affordable to replace and don’t require a licensed technician to service in most cases.

Why the Difference Matters for Repairs

🧰 1. Special Tools & Certification Required

Repairing sealed system components usually requires:

  • EPA-certified technicians

  • Special tools (vacuum pumps, gauges, refrigerant)

  • Careful recharging and leak testing

This makes sealed system repairs more specialized and costly.

💸 2. Cost of Repair vs. Replacement

If a sealed system part fails — like a compressor or evaporator coil — the cost of repair can often approach the cost of a new appliance. Many homeowners choose to replace the fridge entirely in these cases.

In contrast, non-sealed parts like fans or sensors are usually affordable fixes.

⚖️ 3. Warranty Differences

Most manufacturers offer longer warranties (up to 5–10 years) on sealed system parts due to their critical role and cost. Labor is often not included.

Always check your appliance’s warranty before scheduling sealed system repairs.

Quick Tip: How to Tell if It’s a Sealed System Issue

Here are a few signs that sealed system parts might be the problem:

  • Refrigerator running but not cooling

  • No frost buildup in freezer

  • Clicking sounds near the compressor

  • Compressor is hot but not running consistently

If you suspect this, contact a professional or visit PRS Parts Inc. — we’ll help you figure it out.

PRS Parts Inc. Has the Right Part — Sealed or Not

Whether you're replacing a defrost thermostat or getting advice on a compressor issue, the experts at PRS Parts Inc. are here to help. We stock both sealed and non-sealed system parts for major appliance brands and offer local insight and fast support.

Visit PRS Parts Inc. at 540 Lagoon Dr.

For authentic appliance replacement parts and expert repair assistance.

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