Why Does a Older Westinghouse Custom Dehumidifier Ice Up

If your older Westinghouse Custom dehumidifier is icing up, it’s usually due to low refrigerant, dirty coils, or poor airflow. This common issue can reduce efficiency and damage the unit if ignored. Regular maintenance and proper placement can prevent most freezing problems.

Key Takeaways

• Low refrigerant levels: Over time, refrigerant can leak, causing the evaporator coils to get too cold and freeze.
• Dirty or blocked air filters: Restricted airflow forces the coils to work harder, leading to ice buildup.
• Frozen evaporator coils: Ice forms when moisture condenses and freezes on cold coils, often due to poor air circulation.
• Operating in cold environments: Running the dehumidifier in temperatures below 60°F increases the risk of icing.
• Faulty defrost sensor or timer: A malfunctioning defrost system won’t melt ice, allowing it to accumulate.
• Clogged or dirty condenser coils: Reduced heat exchange can cause the system to overwork and freeze.
• Regular maintenance is key: Cleaning filters and coils every few months helps prevent icing and extends unit life.

Why Does an Older Westinghouse Custom Dehumidifier Ice Up?

If you’ve owned a Westinghouse Custom dehumidifier for several years, you might have noticed a frustrating problem: ice forming on the internal coils or around the unit. This isn’t just a cosmetic issue—it can seriously affect performance, reduce moisture removal, and even cause permanent damage if left unchecked. While newer models come with advanced defrost systems and better insulation, older Westinghouse Custom units are more prone to icing due to wear and tear, environmental factors, and lack of maintenance.

Understanding why your older Westinghouse Custom dehumidifier is icing up is the first step toward fixing it. Unlike modern appliances with smart sensors and automatic defrost cycles, older models rely heavily on proper usage conditions and routine care. When those conditions aren’t met—like running the unit in a cold basement or neglecting to clean the filter—the system can’t function efficiently. The result? Ice builds up on the evaporator coils, blocking airflow and forcing the compressor to work harder. Over time, this can lead to overheating, reduced dehumidification, and even system failure.

In this guide, we’ll walk you through the most common reasons your older Westinghouse Custom dehumidifier is icing up, how to diagnose the problem, and what you can do to fix it. Whether you’re dealing with a frozen coil, a clogged filter, or a refrigerant leak, we’ve got practical solutions to help you restore your unit’s performance and extend its lifespan. Let’s dive in.

How Dehumidifiers Work (And Why They Ice Up)

Before we get into the specific causes of icing, it helps to understand how a dehumidifier works. At its core, a dehumidifier is similar to an air conditioner. It pulls in humid air from the room, passes it over cold evaporator coils, and collects the condensed moisture in a tank or drain hose. The dried air is then reheated slightly and blown back into the room. This cycle repeats continuously to maintain your desired humidity level.

The Role of Evaporator and Condenser Coils

The evaporator coils are where the magic happens. These coils are cooled by refrigerant, which absorbs heat from the incoming air. As warm, moist air passes over the cold coils, the moisture condenses into water droplets—just like how dew forms on a cold glass. The water drips into a collection pan, and the now-drier air moves on to the condenser coils, where it’s warmed up before being released back into the room.

However, if the evaporator coils get too cold—below freezing—the moisture doesn’t just condense; it freezes. This ice buildup acts like a barrier, preventing proper airflow and heat exchange. The system can’t remove humidity effectively, and the compressor may overheat trying to compensate. In older Westinghouse Custom models, which lack advanced defrost controls, this problem can escalate quickly.

Why Older Models Are More Prone to Icing

Older dehumidifiers, including the Westinghouse Custom series, were built with simpler technology. They often lack automatic defrost sensors or timers that detect ice buildup and temporarily shut off the compressor to allow the coils to warm up. Instead, they rely on ambient room temperature and user maintenance to prevent freezing. If you’re using the unit in a chilly basement or garage, or if the air filter is clogged, the risk of icing increases significantly.

Additionally, over time, components like the refrigerant charge, fan motor, and coils can degrade. A slow refrigerant leak, for example, reduces the system’s ability to regulate temperature, causing the coils to get excessively cold. Similarly, a weak fan may not move enough air across the coils, leading to localized freezing. These age-related issues make older units more vulnerable to icing than their modern counterparts.

Common Causes of Ice Buildup in Older Westinghouse Custom Dehumidifiers

Now that you understand how dehumidifiers work, let’s look at the most common reasons your older Westinghouse Custom unit might be icing up. Identifying the root cause is essential for effective troubleshooting and repair.

1. Low Refrigerant Levels

Refrigerant is the lifeblood of your dehumidifier’s cooling system. It circulates through the coils, absorbing heat and enabling moisture condensation. Over time, refrigerant can leak due to worn seals, corroded lines, or loose connections. When levels drop, the system can’t maintain proper pressure, causing the evaporator coils to become excessively cold—often below freezing.

Signs of low refrigerant include reduced dehumidification, longer run times, and visible ice on the coils. Unfortunately, refrigerant leaks require professional diagnosis and repair. DIY fixes aren’t recommended, as handling refrigerant requires certification and specialized tools. If you suspect a leak, it’s best to contact a qualified HVAC technician.

2. Dirty or Clogged Air Filters

The air filter in your Westinghouse Custom dehumidifier plays a crucial role in maintaining airflow. It traps dust, pet hair, and other particles, preventing them from entering the internal components. However, when the filter becomes clogged, airflow is restricted. This means less warm air passes over the cold evaporator coils, causing them to drop below freezing and accumulate ice.

Most manufacturers recommend cleaning or replacing the filter every 1–2 months, especially during humid seasons. If you haven’t cleaned yours in a while, this is one of the easiest fixes. Simply remove the filter, vacuum it, or wash it with mild soap and water. Let it dry completely before reinstalling. A clean filter ensures proper airflow and reduces the risk of icing.

3. Operating in Cold Environments

Dehumidifiers are designed to work best in temperatures between 65°F and 80°F. When placed in a cold basement, garage, or crawl space—especially below 60°F—the evaporator coils can easily drop below freezing. Since there’s less warm air to absorb heat, the coils get too cold, and moisture freezes instead of condensing.

If you’re using your Westinghouse Custom dehumidifier in a chilly area, consider relocating it to a warmer room. Alternatively, use a space heater to raise the ambient temperature slightly. Just be sure the heater is safe and doesn’t create a fire hazard. Some users also insulate the area around the dehumidifier to retain heat and improve performance.

4. Faulty Defrost System

While older Westinghouse Custom models don’t have advanced defrost sensors, many still include a basic defrost timer or thermostat. These components monitor coil temperature and temporarily shut off the compressor when ice is detected, allowing the coils to warm up and melt the ice.

If the defrost system fails—due to a broken timer, faulty thermostat, or wiring issue—the unit won’t initiate the defrost cycle. Ice continues to build up, eventually blocking airflow and causing the compressor to overheat. Symptoms include constant ice formation, the unit shutting off unexpectedly, or a burning smell. Testing and replacing defrost components may require professional help, but checking for loose wires or blown fuses is a good first step.

5. Dirty or Blocked Coils

Both the evaporator and condenser coils can accumulate dust and debris over time. Dirty evaporator coils reduce heat absorption, making them colder and more prone to freezing. Clogged condenser coils, on the other hand, prevent proper heat release, causing the system to overwork and potentially freeze.

To clean the coils, turn off and unplug the unit. Remove the front or side panel (refer to your user manual) and use a soft brush or vacuum to gently remove dust. For stubborn grime, use a coil cleaner spray—available at hardware stores. Be careful not to bend the delicate fins. Regular coil cleaning every 6–12 months can prevent icing and improve efficiency.

6. Weak or Failing Fan Motor

The fan is responsible for pulling air through the unit and across the coils. If the fan motor is weak, worn out, or obstructed, airflow decreases. This leads to inadequate heat exchange, causing the evaporator coils to get too cold and freeze.

Listen for unusual noises—like grinding or whining—when the fan runs. If the fan spins slowly or stops intermittently, it may need lubrication or replacement. In some cases, debris like lint or pet hair can block the fan blades. Clear any obstructions and test the unit. If the motor is failing, replacement parts may be available online or through Westinghouse customer support.

How to Diagnose and Fix Icing Issues

Now that you know the common causes, let’s walk through how to diagnose and fix icing problems in your older Westinghouse Custom dehumidifier. With a few simple checks, you can often resolve the issue without calling a technician.

Step 1: Turn Off and Unplug the Unit

Safety first. Always turn off and unplug your dehumidifier before inspecting or cleaning it. This prevents electrical shock and protects the motor from damage.

Step 2: Check the Air Filter

Remove the air filter and inspect it for dirt, dust, or clogs. If it’s dirty, clean it with water or replace it if it’s damaged. A clean filter is one of the easiest and most effective ways to prevent icing.

Step 3: Inspect the Coils

Open the unit’s access panel and examine the evaporator and condenser coils. Look for visible ice, frost, or dust buildup. Use a flashlight if needed. If you see ice, let the unit sit unplugged for several hours to allow it to thaw naturally. Never use a sharp object to chip away ice—this can damage the coils.

Step 4: Clean the Coils

Once the ice has melted, clean the coils using a soft brush or vacuum. For deeper cleaning, apply a coil cleaner spray and let it sit for 10–15 minutes before rinsing (if applicable). Make sure the unit is completely dry before reassembling.

Step 5: Test the Fan

Plug the unit back in and turn it on. Listen to the fan—does it spin smoothly and at full speed? If it’s noisy or slow, check for obstructions. If the motor seems weak, consider replacing it.

Step 6: Monitor Room Temperature

Use a thermometer to check the room temperature. If it’s below 60°F, move the dehumidifier to a warmer area or use a space heater to raise the temperature slightly. Avoid placing the heater too close to the unit.

Step 7: Observe Defrost Behavior

Run the unit for a few hours and watch for signs of defrosting. Does the compressor turn off periodically? Does ice melt and drip into the tank? If not, the defrost system may be faulty and require professional repair.

Step 8: Consider Refrigerant Levels

If none of the above steps resolve the issue, low refrigerant may be the culprit. This requires a licensed technician to diagnose and recharge the system. Attempting to add refrigerant yourself is illegal and dangerous without proper certification.

Preventive Maintenance Tips to Avoid Future Icing

Prevention is always better than repair. With regular maintenance, you can keep your older Westinghouse Custom dehumidifier running smoothly and avoid icing problems altogether.

Clean the Filter Monthly

Make it a habit to check and clean the air filter every month, especially during humid seasons. A clean filter ensures proper airflow and reduces strain on the coils.

Clean the Coils Every 6–12 Months

Dust and debris build up over time, reducing efficiency. Schedule coil cleaning at least once a year, or more often if you live in a dusty environment.

Keep the Unit in a Warm, Well-Ventilated Area

Avoid placing the dehumidifier in cold, drafty, or poorly ventilated spaces. Ideal locations include basements with insulation, laundry rooms, or utility closets with adequate airflow.

Empty the Water Tank Regularly

A full water tank can cause the unit to shut off or overflow, leading to moisture buildup and potential mold. Empty the tank daily or use a continuous drain hose if possible.

Inspect for Leaks and Damage

Periodically check the unit for signs of wear, such as rust, loose wires, or refrigerant leaks. Address minor issues early to prevent bigger problems.

Use a Hygrometer

A hygrometer measures indoor humidity levels. Aim for 30–50% humidity to prevent mold and reduce the workload on your dehumidifier. This helps maintain optimal operating conditions.

When to Call a Professional

While many icing issues can be resolved with DIY maintenance, some problems require expert attention. Here’s when it’s time to call a professional:

• Refrigerant leaks: Only certified technicians can safely handle and recharge refrigerant.
• Electrical faults: If you notice sparks, burning smells, or frequent tripping of circuit breakers, stop using the unit immediately.
• Compressor failure: A failing compressor often makes loud noises or won’t start at all. Replacement is complex and costly.
• Persistent icing: If ice returns after cleaning and troubleshooting, there may be an underlying mechanical issue.

Professional repair can be expensive, so weigh the cost against the value of your older unit. In some cases, replacing the dehumidifier may be more economical than repairing it.

Conclusion

Icing in an older Westinghouse Custom dehumidifier is a common but manageable problem. Most cases are caused by low refrigerant, dirty filters, cold operating environments, or faulty defrost systems. By understanding how your dehumidifier works and performing regular maintenance, you can prevent ice buildup and keep your unit running efficiently for years to come.

Start with the basics: clean the filter, inspect the coils, and ensure the unit is in a warm, well-ventilated space. If the problem persists, consider professional diagnosis—especially for refrigerant or electrical issues. With the right care, your older Westinghouse Custom dehumidifier can continue to protect your home from excess moisture and improve indoor air quality.

Frequently Asked Questions

Why is my Westinghouse dehumidifier freezing up even though the room is warm?

Even in warm rooms, a clogged air filter or dirty coils can restrict airflow, causing the evaporator coils to get too cold and freeze. Check and clean the filter and coils to restore proper airflow.

Can I use my dehumidifier in a cold basement?

It’s not recommended to use a dehumidifier in temperatures below 60°F, as cold air increases the risk of icing. If you must use it in a basement, consider insulating the area or using a space heater to raise the temperature slightly.

How often should I clean the coils on my dehumidifier?

Clean the evaporator and condenser coils every 6–12 months, or more often if you live in a dusty environment. Regular cleaning prevents ice buildup and improves efficiency.

Is it safe to chip ice off the coils?

No, never use sharp tools to remove ice from the coils. This can damage the delicate fins and refrigerant lines. Instead, unplug the unit and let the ice melt naturally.

What should I do if my dehumidifier keeps icing up after cleaning?

If icing continues after maintenance, the issue may be low refrigerant, a faulty defrost system, or a failing compressor. Contact a qualified technician for diagnosis and repair.

Can a dirty filter really cause my dehumidifier to ice up?

Yes, a dirty filter restricts airflow, causing the evaporator coils to get excessively cold and freeze. Cleaning the filter is one of the simplest and most effective ways to prevent icing.