Whirlpool Refrigerator Start Relay Troubleshooting

Is your Whirlpool refrigerator suddenly acting up? Perhaps you’ve noticed it’s not cooling like it should, or maybe you hear a distinct clicking sound from the back but the compressor never kicks on. It’s a frustrating scenario, especially when you’re trying to keep food fresh and avoid a costly service call.

The good news is that many common refrigerator issues, particularly those related to the compressor not starting, often point to a relatively simple fix: a faulty start relay. This small, yet critical, electrical component is responsible for giving your compressor the initial jolt it needs to begin its cooling cycle.

At The Jim BoSlice Workshop, we believe in empowering DIYers with the knowledge and confidence to tackle home repairs. This comprehensive guide will walk you through the entire process of whirlpool refrigerator start relay troubleshooting, from understanding how it works to safely diagnosing and replacing the part. Let’s get that fridge humming again!

Understanding the Start Relay and Your Refrigerator’s Cooling System

Before we dive into fixing things, it’s helpful to understand what the start relay does and how it fits into your refrigerator’s overall cooling mechanism. Think of your refrigerator’s compressor as the heart of its cooling system. It circulates refrigerant, which absorbs heat from inside the fridge and expels it outside.

The compressor motor needs a significant burst of power to start spinning. That’s where the start relay comes in. It’s essentially a switch that provides this initial surge to the compressor’s start winding, then quickly disengages once the motor is running. Without a functioning start relay, your compressor won’t be able to begin its cycle, leading to a warm fridge and spoiled food.

Types of Refrigerator Start Relays

Whirlpool refrigerators typically use one of two main types of start relays:

• PTC (Positive Temperature Coefficient) Relay: This is the most common type. It uses a small ceramic disc that heats up and increases its resistance, effectively cutting off power to the start winding once the compressor is running.
• Potential Relay: Less common on newer models, this type uses a voltage-sensitive coil to open and close contacts. You might find these on older or commercial-grade units.

Understanding which type your fridge has isn’t strictly necessary for troubleshooting, as the diagnostic steps are similar. However, it’s good to know for ordering the correct replacement part. Always cross-reference with your refrigerator’s model number.

Safety First: Preparing for Refrigerator Repair

Whenever you’re working with electrical appliances, safety is paramount. Ignoring these steps can lead to serious injury or damage to your appliance. Don’t skip this section!

Essential Safety Precautions

• Unplug the Refrigerator: This is the single most important step. Always disconnect the refrigerator from its power source before touching any internal components. Don’t just turn it off at the control panel; pull the plug from the wall outlet.
• Wear Protective Gear: Heavy-duty work gloves can protect your hands from sharp edges and components. Safety glasses are also a good idea to shield your eyes from debris or unexpected sparks, though less likely with power disconnected.
• Clear the Area: Ensure you have enough space to work safely around the refrigerator. Pull it away from the wall carefully, watching out for the water line if you have an ice maker.
• Have Proper Lighting: A good work light or headlamp will illuminate the cramped space behind and under the fridge, making it easier to see what you’re doing.

Tools You’ll Need

Having the right tools on hand will make the job much smoother:

• Screwdrivers: Phillips head and flathead for removing access panels.
• Nut Drivers or Socket Set: Often, the compressor cover or relay is secured with hex-head screws.
• Multimeter: Absolutely essential for testing electrical continuity and resistance. A digital multimeter is preferred for easy reading.
• Needle-Nose Pliers: Useful for disconnecting stubborn wires or clips.
• Work Gloves: For protection.
• Flashlight or Headlamp: For better visibility.

Common Symptoms of a Faulty Start Relay

Knowing what to look for is half the battle when it comes to whirlpool refrigerator start relay troubleshooting. Here are the most common signs that your start relay might be failing:

The Dreaded Clicking Sound

This is perhaps the most classic symptom. You’ll hear a distinct click, usually every few minutes, coming from the back of the refrigerator, often followed by a hum that quickly stops. This sound is typically the compressor’s thermal overload protector tripping because the compressor is trying to start but failing. The relay isn’t providing the necessary “kick.”

Refrigerator Not Cooling

If your fridge isn’t getting cold, but the interior light still works, and you don’t hear the compressor running, a bad start relay is a prime suspect. The fan might still be running, circulating warm air, but without the compressor, there’s no actual cooling happening. You’ll notice food spoiling faster and ice melting in the freezer.

Compressor Not Starting At All

Sometimes, there’s no clicking, just silence from the compressor area. The refrigerator might seem completely dead in terms of cooling, though other components like lights or display panels might still be active. This can also indicate a failed start relay that’s not even attempting to engage the compressor.

Warm Fresh Food Compartment, Thawing Freezer

These are direct consequences of the refrigerator not cooling. If your fresh food compartment is warm and your freezer contents are thawing, the entire refrigeration cycle has been compromised. While other issues can cause this, a faulty start relay is a common mechanical failure that leads to these symptoms.

Step-by-Step Whirlpool Refrigerator Start Relay Troubleshooting

Now for the hands-on part. Follow these steps carefully to diagnose your start relay. Remember, safety first!

Step 1: Accessing the Compressor and Start Relay

1. Unplug the Refrigerator: Seriously, do it now if you haven’t already.
2. Pull the Refrigerator Out: Gently slide the refrigerator away from the wall to gain access to the back.
3. Remove the Compressor Access Panel: Most Whirlpool refrigerators have a metal or cardboard access panel at the bottom rear. You’ll usually need a Phillips head screwdriver or a nut driver to remove the screws securing it. Set the panel and screws aside safely.
4. Locate the Compressor: The compressor is the large, black, usually round or oval tank at the bottom rear of the refrigerator.
5. Identify the Start Relay: The start relay (and often the overload protector) will be attached to the side of the compressor, typically plugged directly into the compressor’s electrical terminals. It’s usually a small, black plastic or ceramic component. There might be a protective cover over it.

Step 2: Visual Inspection of the Start Relay

Before you even grab your multimeter, a visual check can sometimes reveal obvious problems.

1. Remove the Relay: Carefully pull the relay straight off the compressor terminals. It might be snug. Note the orientation of any wires connected to it before you disconnect them. Take a photo if needed.
2. Examine for Damage: Look for any signs of burning, melting, cracks, or discoloration on the relay’s housing. A burnt smell is also a strong indicator of an internal electrical failure. If you see any of these, the relay is likely bad and needs replacement.
3. Check for Loose Connections: Ensure all wires were securely attached. Sometimes a loose wire can mimic a bad relay.

Step 3: Testing the Start Relay with a Multimeter

This is where your multimeter becomes your best friend. We’ll be testing for continuity or resistance, depending on the relay type.

Testing a PTC Start Relay

Most Whirlpool refrigerators use a PTC relay.

1. Set Your Multimeter: Set your multimeter to the ohms (Ω) setting, specifically for measuring resistance. A range like 200Ω is usually appropriate.
2. Identify the Terminals: A PTC relay typically has two spade terminals where the wires connect and two holes where it plugs into the compressor. The critical test is across the two holes that connect to the compressor’s run and start windings.
3. Test for Resistance: Place one multimeter probe into each of the two holes on the relay that connect to the compressor pins.
   • Good Reading: A healthy PTC relay should show a very low resistance reading, typically between 0.5 to 12 ohms, depending on the model.
   • Bad Reading: If you get an “OL” (Open Line) or infinite resistance reading, or a very high resistance reading (hundreds or thousands of ohms), the PTC disc inside is likely broken or faulty. This means the relay is bad and needs to be replaced.

Testing a Potential Relay (Less Common)

If your refrigerator has an older potential relay, the testing method is slightly different.

1. Set Your Multimeter: Set it to the continuity setting (often indicated by a speaker icon) or a low ohms range.
2. Test Coil Continuity: Identify the two terminals for the coil (refer to a wiring diagram for your model if unsure). Place probes across these terminals. You should get a resistance reading (usually a few hundred ohms) or hear a beep for continuity. No reading or infinite resistance indicates a bad coil.
3. Test Contacts: With the relay inverted (as it would be when installed), there should be continuity between the “start” winding terminal and the “run” winding terminal. When you turn it upright, continuity should break. This simulates the internal switch.

Step 4: Compressor Health Check (Optional but Recommended)

While you’re there, it’s a good idea to quickly check the compressor windings. A faulty compressor can also prevent cooling, and it’s much more expensive to fix.

1. Identify Compressor Terminals: There are three pins on the compressor where the relay plugs in: Common (C), Run (R), and Start (S). They often form a triangular pattern. If they aren’t labeled, you can usually identify them by tracing wires on the old relay or by looking up a wiring diagram for your specific Whirlpool model.
2. Set Multimeter to Ohms (Ω): Use a low ohms range.
3. Test Winding Resistance:
   • C to R: Note the resistance.
   • C to S: Note the resistance.
   • R to S: Note the resistance.
   • Expected Readings: The resistance from C to S should be the highest. The resistance from C to R should be lower. The resistance from R to S should be approximately the sum of C-R and C-S. For example, if C-R is 3 ohms and C-S is 6 ohms, then R-S should be around 9 ohms.
   • Ground Test: Place one probe on any compressor terminal and the other on the bare metal casing of the compressor. You should get an “OL” or infinite resistance reading (no continuity). If you get a reading, it indicates a short to ground, meaning the compressor is likely bad.

If your compressor tests good but the relay tests bad, you’ve found your culprit!

Replacing a Defective Start Relay

Once you’ve confirmed the start relay is faulty, replacing it is usually straightforward.

1. Obtain the Correct Part: Purchase a new start relay specifically designed for your Whirlpool refrigerator model. Always use your refrigerator’s full model number to ensure compatibility. You can often find this on a sticker inside the fridge compartment or on the back.
2. Install the New Relay:
   • Carefully plug the new relay onto the compressor terminals, ensuring it’s seated firmly.
   • Reconnect any wires you previously removed, making sure they are secure. Refer to your photo if you took one.
3. Reassemble: Replace the compressor access panel and secure it with its screws.
4. Restore Power: Plug your refrigerator back into the wall outlet.
5. Test: Listen for the compressor to start. It should run smoothly without clicking. Allow several hours for the refrigerator to cool down to its operating temperature. Check both the fresh food and freezer compartments.

Preventing Future Issues & Pro Tips

While you’ve mastered whirlpool refrigerator start relay troubleshooting, a few pro tips can help prevent future headaches and keep your fridge running efficiently.

Keep the Coils Clean

Dirty condenser coils force your compressor and its components, including the start relay, to work harder. This can shorten their lifespan. Make it a habit to clean the condenser coils at the bottom or back of your fridge every 6-12 months using a coil brush and vacuum.

Ensure Proper Ventilation

Your refrigerator needs adequate airflow around it to dissipate heat. Don’t push it too close to the wall, and avoid blocking the vents at the bottom or back.

Avoid Overloading the Fridge

While a full fridge is more efficient than an empty one, overpacking it can restrict airflow and make the compressor work harder, potentially stressing the start relay.

Consider a Surge Protector

Electrical surges can damage sensitive electronic components like the start relay. A good quality surge protector designed for appliances can offer an extra layer of protection.

When to Call a Pro

Sometimes, despite your best troubleshooting efforts, the problem persists. If you’ve replaced the start relay and the compressor still isn’t starting, or if your compressor tests bad, it’s usually time to call a professional appliance technician. Compressor replacement is a complex job involving refrigerant handling and specialized tools, best left to experts. Don’t attempt to “bump start” a compressor repeatedly if it’s not working; this can cause more damage.

Frequently Asked Questions About Whirlpool Refrigerator Start Relay Troubleshooting

What is the average lifespan of a refrigerator start relay?

The lifespan of a start relay can vary widely, but they generally last anywhere from 5 to 10 years or even longer. Factors like frequent power surges, dirty condenser coils, or a struggling compressor can shorten its life.

Can a faulty start relay damage my compressor?

Yes, a failing start relay can put undue stress on the compressor. If the relay doesn’t provide the correct starting power or cycles on and off rapidly, it can cause the compressor to overheat or wear out prematurely. That clicking sound is the compressor’s overload protector trying to save it.

Are Whirlpool start relays universal, or do I need a specific one?

No, start relays are not universal. You absolutely need a specific replacement part that matches your Whirlpool refrigerator’s model number. Different compressors and refrigeration systems require relays with specific electrical characteristics. Always double-check compatibility before purchasing.

How long does it typically take to replace a start relay?

Once you’ve identified the problem and have the correct part, replacing a start relay is a relatively quick job, often taking only 15-30 minutes for a DIYer. The longest part is usually accessing the component and ensuring all safety steps are followed.

My refrigerator still isn’t cooling after replacing the start relay. What next?

If replacing the start relay didn’t solve the cooling issue, and you’ve confirmed the new relay is working, the problem likely lies elsewhere. Recheck your compressor winding tests for a potential internal compressor failure. Other culprits could include a faulty condenser fan motor, evaporator fan motor, defrost timer, main control board, or a refrigerant leak. At this point, it’s often best to consult a professional appliance technician.

Get Your Fridge Back in Business!

Tackling a refrigerator repair might seem daunting at first, but with a clear head, the right tools, and this step-by-step guide to whirlpool refrigerator start relay troubleshooting, you’re well-equipped to diagnose and fix a common problem. Remember, safety always comes first – unplug that fridge! By understanding your appliance and taking a methodical approach, you’ll not only save money but also gain a valuable sense of accomplishment. Keep those food items chilled, and happy tinkering from The Jim BoSlice Workshop!

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Jim Boslice

Jim Boslice is a power tool enthusiast who tests, reviews, and shares practical guides to help DIYers and professionals choose the right tools for every project.

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