Fridge Red Button: Complete Reset Guide (July 2026)

I remember the first time my refrigerator stopped cooling properly. I opened the back panel and saw this mysterious red button staring back at me. If you are standing in front of your fridge wondering what that little red button actually does, you are not alone. This comprehensive guide will explain exactly what the fridge red button is, when to press it, and how to safely troubleshoot your refrigerator compressor.

The red button on your refrigerator compressor is actually a reset mechanism built into the thermal overload protector. When your compressor overheats or draws too much current, this safety device trips and cuts power. That small red button allows you to manually reset the protection circuit and restore power to your compressor.

Our team has researched hundreds of repair forums and technical manuals to bring you the most accurate information about refrigerator start relay systems. Whether your fridge is clicking but not starting, humming without running, or completely warm inside, this guide will walk you through everything you need to know about that mysterious red button.

What Is the Fridge Red Button and What Does It Do

The fridge red button is a manual reset switch located on the thermal overload protector, which is typically mounted on or near the compressor start relay. This button serves one critical purpose: it resets the overload protection circuit after it has tripped due to overheating or excessive current draw.

When your refrigerator compressor works harder than it should, it generates excess heat. The thermal overload protector monitors this temperature and the electrical current flowing through the compressor. If either exceeds safe limits, the protector trips and cuts power to prevent permanent damage. The red button allows you to manually restore power once the compressor has cooled down.

Understanding the Reset vs Restart Difference

Many homeowners confuse resetting with restarting. Restarting simply means turning your refrigerator off and back on using the power switch or unplugging it. Resetting specifically refers to pressing that red button to restore power to a tripped overload protector.

Think of the red button like a circuit breaker in your home electrical panel. When a breaker trips, flipping it back restores power. The red button works the same way for your compressor’s internal protection system. However, simply resetting the button without addressing the underlying cause is like flipping a breaker back on without fixing the electrical problem that caused it to trip.

Why the Overload Protector Trips

Several conditions can cause the thermal overload to trip and require you to press the red button:

Compressor overheating: When dust accumulates on condenser coils or the condenser fan fails, your compressor works harder and runs hotter. This excess heat triggers the overload protector.

Electrical overload: If your compressor is failing internally or the start relay is malfunctioning, it may draw excessive amperage. The overload protector detects this high current and shuts down power to prevent electrical damage.

Freon issues: Low refrigerant levels force the compressor to run longer cycles, generating more heat than the protection system allows.

Age and wear: Older compressors may develop internal electrical resistance issues that cause them to run hot even under normal conditions.

Safety First: Power Disconnection Steps

Before you attempt any work on your refrigerator compressor or press the red button, safety must be your top priority. The compressor system contains electrical components that can deliver serious shocks, and some parts retain electrical charge even when unplugged.

Step 1: Unplug the refrigerator completely. Never work on electrical components while power is connected. Pull the plug from the wall outlet and verify the refrigerator lights are off.

Step 2: Wait for the compressor to cool. If the overload protector has tripped, the compressor is likely hot to the touch. Wait at least 15 to 30 minutes for it to cool before attempting any reset or testing. Attempting to reset a hot compressor can damage the internal components.

Step 3: Discharge the capacitor (if present). Some refrigerator compressor systems include a run capacitor that stores electrical charge. This component can deliver a painful shock even with the refrigerator unplugged. If you see a cylindrical or oval component attached to the wiring, do not touch the terminals. Use an insulated screwdriver to short across the terminals before proceeding, or simply avoid touching the capacitor entirely.

Step 4: Work in a dry environment. Never troubleshoot electrical components with wet hands or while standing on wet surfaces. Water and electricity create dangerous conditions.

Understanding Your Refrigerator’s Start Relay System

To understand what the red button does, you need to understand how the entire compressor starting system works. The start relay is the brain that tells your compressor when to start and helps it get running. The overload protector with its red button is the safety guard that prevents damage when things go wrong.

Component Identification Guide

The Compressor: This black cylindrical or roundish component sits at the bottom rear of your refrigerator. It has three metal pins or terminals protruding from the side or top, labeled Common (C), Run (R), and Start (S).

The Start Relay: This plastic box or cover attaches directly to the compressor terminals. Inside, you will find either a PTC thermistor (a black or brown disc or pill-shaped component) or a current relay (a mechanical switch). This component provides the initial electrical boost needed to start the compressor.

The Overload Protector: Usually attached to the Common terminal, this small device contains the red button we are discussing. It monitors current and temperature, cutting power when limits are exceeded.

The Run Capacitor: Not all refrigerators have one, but if present, this cylindrical component helps maintain running efficiency. It is usually mounted separately and connected with wires to the relay assembly.

PTC Thermistor vs Current Starting Relay

Modern refrigerators typically use one of two start relay technologies. Understanding which type you have helps with troubleshooting.

PTC Thermistor Relays: These use a Positive Temperature Coefficient thermistor, which is essentially a ceramic disc that changes resistance based on temperature. When cold, it allows current to flow to the start winding. As it heats up, resistance increases and current is cut off to the start winding. PTC relays are silent, reliable, and have no moving parts. You will recognize them by the black or brown ceramic disc inside the relay cover.

Current Relays: Older or larger refrigerators may use current sensing relays. These electromagnetic devices physically click when engaging and disengaging the start winding. If you hear clicking sounds coming from your compressor area, you likely have a current relay. The red button on these systems works the same way but the relay itself may be the component needing replacement.

How the System Works Together

When your thermostat calls for cooling, power flows through the overload protector to the start relay. The relay routes current to both the run winding and start winding of the compressor, creating the rotating magnetic field needed to start the motor.

Once the compressor reaches about 75% of running speed, the start relay disconnects the start winding. The compressor continues running on the run winding alone. If anything goes wrong during this process, the overload protector monitors the situation and trips if necessary, requiring you to press the red button after the problem is resolved.

How to Reset the Fridge Red Button: Step-by-Step Guide

Now that you understand what the red button does and how the system works, here is the complete procedure for resetting your refrigerator compressor. Follow these steps exactly to avoid damage or injury.

Step 1: Access the compressor. Pull your refrigerator away from the wall. Remove the rear access panel, usually held by screws or clips. The compressor sits at the bottom, a black cylindrical component about the size of a large coffee can.

Step 2: Locate the start relay assembly. Look for a plastic box or cover attached to the side of the compressor. This is the start relay housing. On most refrigerators, the overload protector with the red button attaches to this assembly or sits alongside it.

Step 3: Identify the red button. The red button is typically small, round, and protrudes from the overload protector. On some models, it may be red plastic or have a red dot marking. It may be recessed and require a pen or small tool to press.

Step 4: Verify the compressor is cool. Touch the compressor body carefully. If it feels hot, wait longer. A hot compressor indicates the overload tripped recently. Resetting while hot can damage the compressor.

Step 5: Press the red button firmly. Use your finger or a non-conductive tool to press the button until you feel or hear a click. This click indicates the overload protector has reset and power can flow again.

Step 6: Plug in and test. Replace the rear panel if desired. Plug the refrigerator back into the outlet. Listen carefully. You should hear the compressor start within a few minutes. A healthy startup sounds like a low hum that stabilizes quickly.

What to Listen For After Resetting

A properly functioning compressor produces a steady, low-frequency humming sound after startup. The sound should remain consistent without clicking, buzzing, or irregular changes in pitch.

If you hear rapid clicking sounds after resetting, the start relay is likely faulty or the compressor is failing to start. Unplug the refrigerator immediately to prevent damage. The overload protector will likely trip again within seconds or minutes.

How to Tell If Your Refrigerator Start Relay Is Bad

Pressing the red button only works if the overload protector tripped due to a temporary condition. If your start relay has failed, the red button reset will not fix the underlying problem. Here are the specific symptoms that indicate your start relay needs replacement.

Symptom 1: Clicking Sounds Every Few Minutes

This is the most common sign of a bad start relay. You will hear a distinct click followed by humming, then another click about 2 to 5 minutes later. This pattern repeats indefinitely.

What is happening: The overload protector is allowing power through, but the start relay is not engaging properly. The compressor tries to start, fails, draws excessive current, and the overload trips again. After a few minutes, the overload cools and resets automatically, starting the cycle over.

Symptom 2: Humming Without Starting

If you hear a continuous humming sound from the compressor area but the compressor never actually starts running, the start relay is likely not providing the necessary start winding activation.

What is happening: The run winding receives power and creates the humming sound, but without the start winding engaged via the relay, the compressor cannot begin rotation. It sits there energized but stalled, eventually overheating and tripping the overload protector.

Symptom 3: Compressor Hot but Not Running

After attempting a reset, check the compressor temperature. If it feels hot but you never heard it run, the relay is likely stuck in a position that energizes part of the compressor without allowing full startup.

What is happening: Electrical current is flowing through portions of the compressor windings, generating heat, but the motor is not rotating. This condition can permanently damage the compressor if allowed to continue.

Symptom 4: Visual Inspection Signs

Remove the start relay cover and inspect the components:

Burn marks or discoloration: Any blackening, melting, or charring on the relay or overload protector indicates electrical failure. Replace the component immediately.

Rattling sounds: Shake the relay assembly gently. If you hear rattling inside, the internal components have broken loose. This is common with failed PTC thermistors.

Physical damage: Cracked plastic, corroded terminals, or melted connectors all indicate the relay has failed and needs replacement.

Testing the Start Relay with a Multimeter

A multimeter continuity test can confirm whether your start relay is functioning properly. This simple test takes less than five minutes and provides definitive answers about relay health.

Setting Up Your Multimeter

Set your multimeter to the continuity or resistance (ohms) setting. The continuity setting beeps when a circuit is complete, making testing faster. If your meter does not have continuity mode, use the lowest ohms setting (usually 200 ohms).

Ensure the refrigerator remains unplugged throughout testing. Remove the start relay cover to access the compressor terminals and relay connections.

Testing Between Terminals

Test 1: Common to Run – Place one probe on the Common terminal (usually marked C or the middle terminal) and one on the Run terminal (marked R). You should get a resistance reading between 1 and 5 ohms. A reading of 0 ohms indicates a short. A reading of OL (open line) or infinity indicates an open winding.

Test 2: Common to Start – Test between Common and Start (marked S). This reading should be slightly higher than the Common to Run reading, typically 3 to 7 ohms. The relationship between these readings matters more than the exact numbers.

Test 3: Start to Run – Test between Start and Run terminals. This reading should equal the sum of your first two readings. For example, if Common to Run was 2 ohms and Common to Start was 5 ohms, Start to Run should read approximately 7 ohms.

Interpreting the Results

Good compressor: All three tests show low resistance values (under 10 ohms), and the Start to Run reading equals the sum of the other two tests.

Open winding: Any test showing OL or infinite resistance indicates a broken wire inside the compressor. The compressor needs replacement.

Shorted winding: Any test showing 0 ohms or very low resistance (under 0.5 ohms) indicates winding damage. The compressor needs replacement.

Ground fault: Test each terminal to the compressor body or ground pin. Any continuity here indicates the winding is touching the compressor casing, creating an electrical hazard. The compressor needs replacement.

Brand-Specific Red Button Locations

While most refrigerator compressors follow similar designs, the exact location and appearance of the red reset button varies by manufacturer. Knowing where to look on your specific brand saves time and frustration.

Whirlpool and KitchenAid Refrigerators

On most Whirlpool models, the start relay assembly mounts on the lower left side of the compressor when viewed from the rear. The red button sits on the overload protector, which attaches to the Common terminal. Look for a small red dot or protruding button on the side of the black overload component.

Some newer Whirlpool models use a combined relay/overload unit with the reset button recessed inside the plastic housing. You may need to remove a small cover to access it.

Samsung and LG Refrigerators

Samsung and LG typically use PTC thermistor relays with the overload protector mounted separately. The red button is usually visible from the rear without removing covers on these models. Look for the overload protector clipped onto the compressor body near the electrical terminals.

On inverter compressor models (identified by a black inverter board attached to the compressor), there is no traditional red button. These systems use electronic protection and reset automatically or require a different troubleshooting approach.

Frigidaire and Electrolux Refrigerators

Frigidaire models often place the start relay inside a plastic box that clips over the compressor terminals. The overload protector with the red button sits alongside this box or attaches to the Common terminal on the left side. The button is typically red plastic and may be recessed, requiring a pen to press.

GE and Hotpoint Refrigerators

GE uses several relay configurations depending on the model age. Older units use traditional current relays with visible red buttons on the overload protector. Newer models may use sealed relay assemblies where the reset function is integrated and not user-accessible.

On models with accessible red buttons, look on the left side of the compressor body where the wiring harness connects.

Kenmore and Sears Refrigerators

Kenmore appliances are manufactured by various companies (Whirlpool, LG, Frigidaire), so the location depends on the actual manufacturer. Check your model number prefix to identify the maker:

Prefix 106, 253, 795: Made by Frigidaire – check left side of compressor

Prefix 110, 796: Made by Whirlpool – check lower left terminal area

Prefix 591, 795: Made by LG – check rear-facing overload protector

Emergency Start Procedure (Temporary Fix)

If your refrigerator has failed and you need temporary cooling while waiting for a replacement part, there is a method to manually start the compressor. Use this only in emergencies and never leave the refrigerator unattended while using this method.

Warning: This procedure bypasses safety protections. Prolonged use can permanently damage your compressor or create fire hazards. Use only for short-term emergencies.

Step 1: Unplug the refrigerator and remove the start relay cover.

Step 2: Identify the three compressor terminals: Common, Run, and Start.

Step 3: Obtain a short length of 14-gauge insulated wire with alligator clips on both ends.

Step 4: Connect one clip to the Common terminal and one to the Start terminal.

Step 5: Plug in the refrigerator for exactly 1 to 2 seconds, then unplug immediately.

Step 6: Move the wire from the Start terminal to the Run terminal.

Step 7: Plug in the refrigerator. The compressor should start and run.

Monitor the refrigerator constantly. If the compressor sounds abnormal or gets hot, unplug immediately. This procedure provides temporary cooling only until you can replace the start relay properly.

Preventive Maintenance to Avoid Red Button Trips

The best way to deal with a tripped overload protector is preventing it from happening in the first place. Regular maintenance keeps your compressor running efficiently and reduces the conditions that cause overload trips.

Clean Condenser Coils Every Six Months

Dirty condenser coils are the leading cause of compressor overheating. These coils, located on the back of older refrigerators or underneath newer models, release heat from the refrigerant. When dust accumulates, heat cannot escape efficiently, forcing the compressor to work harder and run hotter.

Use a coil brush or vacuum with a brush attachment to clean coils every six months. Pull the refrigerator out for rear coils, or remove the front grille for bottom coils. Clean until you see bare metal between the fins.

Verify Condenser Fan Operation

The condenser fan pulls air across the compressor and condenser coils. If this fan fails, heat builds up rapidly. Listen for the fan running when the compressor operates. Visually verify the fan blade spins freely without obstruction.

Replace a faulty condenser fan immediately. Running without this cooling airflow guarantees compressor overheating and red button trips.

Check Door Seals Monthly

Worn door seals allow warm air infiltration, forcing longer compressor run times. Test seals by closing a dollar bill in the door. If you can pull it out easily, the seal needs replacement.

Clean seals with mild soap and water to remove food residue that prevents proper sealing. Replace torn or cracked seals promptly.

Maintain Proper Clearance

Refrigerators need breathing room. Maintain at least 2 inches clearance behind the unit and 1 inch on each side. Blocking ventilation traps heat around the compressor, leading to overload trips.

When to Call a Professional

While resetting the red button and replacing a start relay are within the capabilities of many DIY homeowners, some situations require professional service. Knowing when to call prevents wasted effort and potential safety hazards.

Call a Technician When:

The compressor shows ground fault: If your multimeter shows continuity between any compressor terminal and the compressor body, you have a ground fault. This requires compressor replacement, which involves refrigerant handling and specialized equipment.

Compressor windings are open or shorted: Failed winding readings mean the compressor itself is damaged. Replacing the start relay will not help. Compressor replacement or a new refrigerator is necessary.

You are not comfortable working with electrical components: If the procedures in this guide feel beyond your skill level, trust your instincts. Refrigerators contain high-voltage components and refrigerant under pressure. Professional technicians have the training and equipment to work safely.

The refrigerator uses an inverter compressor: Modern high-efficiency refrigerators often use inverter-driven compressors with complex electronic controls. These systems do not have traditional red buttons and require specialized diagnostic tools.

Resetting works temporarily but fails again: If pressing the red button fixes the problem for a day or two before tripping again, you have an underlying issue needing diagnosis. Temporary resets waste energy and risk permanent compressor damage.

Expected Repair Costs

Understanding repair costs helps you decide between fixing and replacing. A start relay replacement typically costs $30 to $80 for the part plus $100 to $200 for labor if you hire a technician. This makes DIY replacement attractive for handy homeowners.

Compressor replacement runs $500 to $1,200 including labor, often making replacement more economical for older refrigerators. Consider the age and overall condition of your unit when making this decision.

FAQs

Conclusion: Understanding Your Fridge Red Button

The fridge red button serves a simple but vital purpose: it resets the thermal overload protector that prevents compressor damage from overheating or electrical faults. Understanding what this button does, when to press it, and when replacement parts are needed can save you hundreds in repair costs and extend your refrigerator’s lifespan.

Remember that pressing the red button only addresses the symptom, not the cause. If your overload protector trips repeatedly, investigate dirty condenser coils, failing condenser fans, or a malfunctioning start relay. Regular maintenance prevents most of the conditions that cause red button trips in the first place.

With the information in this guide, you now have the knowledge to safely troubleshoot your refrigerator compressor, test components with a multimeter, and make informed decisions about DIY repairs versus professional service. A working refrigerator keeps your food safe and your household running smoothly.