Samsung DVE45T3400W Dryer Relay Replacement & Troubleshooting

Samsung DVE45T3400W Dryer Relay Replacement Guide

Hi there, I’m Drew Callahan, and over the years, I’ve traveled more than 80,000 miles across North America in three different rigs, fixing appliances in every climate you can imagine. I’ve replaced parts on dryers, washers, fridges, and ice makers in garages, campgrounds, and RVs, gaining hands-on experience through necessity. Today, I’m here to help you tackle a common issue with the Samsung DVE45T3400W dryer. This popular electric dryer model is equipped with a sophisticated control board that manages heating elements, drum rotation, and cycle timing. A crucial component of this control board is the heating element relay, which acts as an electrical switch that controls power delivery to the dryer’s heating element. If this relay fails, your DVE45T3400W will go through the motions but fail to generate heat, leaving you with damp clothes. In this guide, I’ll walk you through diagnosing and replacing the faulty relay in your dryer.

Understanding the DVE45T3400W Relay System

What Relay Controls Heating on the DVE45T3400W

The DVE45T3400W features multiple relays on its main control board, but the most critical for heating operation is the heating element relay (also known as the main heating relay or heat relay). This component serves as an electromechanical switch that receives a low-voltage signal from the dryer’s control module and uses that signal to switch high-voltage power (typically 240 volts) to the heating element.

On the DVE45T3400W control board, the heating element relay is responsible for completing the circuit between the incoming 240-volt supply and the heating element. If this relay isn’t functioning properly, voltage never reaches the heating element, which means no heat generation, even if the drum rotates and the fan runs normally.

While the DVE45T3400W also has additional relays for controlling the blower motor and drum motor circuits, these typically continue to function even when the heating relay fails. This is why your dryer may still run but fail to heat.

How the Relay Works in the DVE45T3400W

The heating relay in the DVE45T3400W operates on a straightforward electromagnetic principle. When the control board sends a low-voltage signal (usually 24 or 120 volts depending on the specific control board revision) through the relay coil, it creates a magnetic field that pulls a metal switch contact to a closed position. This closed contact allows the high-voltage 240-volt current to flow through to the heating element. When the control board de-energizes the coil, the contacts spring back to the open position, cutting power to the heating element.

Symptoms of a Failed DVE45T3400W Heating Relay

Common Warning Signs

• Dryer runs but no heat: The drum rotates and the fan operates, but clothes come out cold and damp—the most common indicator of relay failure on the DVE45T3400W.
• Intermittent heating: Heat works sometimes but cuts out randomly during a cycle, suggesting the relay contacts are partially worn or corroded.
• Audible clicking from the control board: A rapid clicking sound coming from inside the DVE45T3400W indicates the relay is attempting to engage repeatedly, typically due to a failing coil.
• Burning smell: A burnt or acrid odor from the control board area suggests relay contacts have arced and burned, a sign of imminent complete failure.
• Visible damage to relay: Physical swelling, blackening, or visible burn marks on the relay body indicate internal failure.
• Partial heat output: Clothes dry slowly over extended cycles, suggesting reduced heating power due to high contact resistance.

Identifying the Failed Relay on Your DVE45T3400W

Visual Inspection of the Control Board

The first step in diagnosing a bad relay on your DVE45T3400W is to visually inspect the control board for any obvious damage. Before you begin, ensure the dryer is disconnected from electrical power at the circuit breaker.

Open up your DVE45T3400W and locate the control board, which is typically mounted near the top front of the unit. Look for any of these visual indicators of relay failure:

• Swollen or bulging relay body indicating internal arcing and gas buildup.
• Black or brown discoloration on the relay casing.
• Burnt or melted plastic around the relay terminals.
• White or green corrosion on relay contact pins.
• Cracked or split relay housing.

On the DVE45T3400W control board, the heating element relay is usually one of the larger electromechanical relays, measuring about 1 inch by 0.75 inches. It will be clearly distinct from smaller capacitors and solid-state components.

Relay Location on the Control Board

The heating relay on the DVE45T3400W is located on the main control board, accessed by removing the top panel of the dryer. The exact position may vary slightly depending on the board revision, but it’s typically positioned toward the middle-to-right portion of the board when viewed from the front. You’ll find it labeled on the circuit board, commonly marked as “RL1,” “K1,” or “HT” depending on the schematic revision.

Accessing the Control Board on the DVE45T3400W

Step-by-Step Disassembly

1. Disconnect power: Unplug the DVE45T3400W from the electrical outlet and turn off the circuit breaker for added safety.
2. Remove the top panel: Open the dryer door and locate the two screws at the front edge of the top panel. Remove these screws and lift the top panel up and away from the dryer body.
3. Access the control board area: With the top panel removed, you’ll see the back of the control console. The control board is located inside the console housing.
4. Remove console screws: Look for 2-3 screws securing the control console to the cabinet. Carefully remove these screws.
5. Disconnect wire harnesses: Gently pull the console assembly upward and away from the cabinet. You’ll see several wire harnesses connected to the control board. Photograph these connections before disconnecting them, or label each wire with painter’s tape.
6. Disconnect the main control board: The primary harness connecting to the control board should disconnect with a gentle pulling motion. The control board typically has one or two large connectors that must be fully seated when reassembling.
7. Remove the control board: After all harnesses are disconnected, remove any remaining screws holding the control board to the console housing and carefully lift it out.

⚠️ Safety Warning: Even with the DVE45T3400W unplugged, the control board may retain residual electrical charge in capacitors. Avoid touching component leads or attempting any work on the board until you’ve safely discharged this residual energy. It’s a good idea to ground yourself by touching a metal part of the dryer frame before handling the board.

Testing the Relay with a Multimeter

Coil Resistance Test

Before you commit to replacing the relay on your DVE45T3400W, you can perform preliminary testing to confirm relay failure:

1. Set your multimeter to the resistance (ohms) setting: Use the 200-ohm scale initially.
2. Locate the relay coil terminals: On the DVE45T3400W control board, the relay will have distinct terminals. Typically, a relay has 4-8 pins arranged in two groups: the coil pins (usually on one side) and the contact pins (usually on the opposite side).
3. Place multimeter probes on coil terminals: Identify the coil terminals (consult the control board schematic if needed—they’re usually labeled on the board) and place one probe on each coil terminal.
4. Record the resistance reading: A healthy relay coil will show resistance between 200-2000 ohms depending on the specific relay design used in your DVE45T3400W. A reading of infinite resistance (∞ or OL) indicates an open coil and confirms relay failure. A reading of 0 ohms or very low resistance may indicate a short circuit.

Contact Resistance Test

The contact resistance test is more definitive for diagnosing heating relay problems on the DVE45T3400W:

1. Leave the coil de-energized: Do not apply control voltage to the relay coil. Energizing a coil on a populated control board is bench work for a technician with an isolated supply—it’s not necessary to get a usable reading.
2. Close the contacts mechanically instead: With the board out of the dryer and completely unpowered, gently press on the relay armature to hold the contacts closed, then test resistance across the contact pins.
3. With contacts closed, measure resistance: Healthy relay contacts should show nearly 0 ohms (less than 1 ohm ideally). A reading higher than 5 ohms suggests contact corrosion. A reading of infinite resistance means the contacts won’t close—indicating definite failure of your DVE45T3400W heating relay.

⚠️ Safety Warning: Do not apply voltage to the relay coil. On the DVE45T3400W, that coil shares a board with circuits that switch 240 volts to the heating element, and hand-energizing it—in the dryer or on the bench—risks destroying the board and puts you next to live high-voltage contacts. Everything a DIY diagnosis needs is a de-energized measurement: coil resistance on the 200-ohm scale and continuity across the switched contacts with the armature held closed by hand. If those readings still leave you unsure, an appliance technician can bench-test the board on an isolated, current-limited supply.

Relay Replacement Options for the DVE45T3400W

Option 1: Desoldering and Replacing the Relay

If you have soldering skills and the right equipment, you can desolder the failed relay from the DVE45T3400W control board and solder in a replacement relay. This is the most economical option but requires:

• A suitable replacement relay with identical specifications (same voltage ratings and contact configuration).
• A quality soldering iron (40-60 watts minimum) or desoldering station.
• Solder wick or a desoldering pump.
• Flux cleaner for board cleaning after desoldering.
• Steady hands and soldering experience.

The cost of a replacement relay (typically $15-40) is significantly less than replacing the entire board, making this option attractive if you have the skills. However, if you don’t have soldering experience, mistakes could damage the board beyond repair, potentially costing more than a full replacement.

Option 2: Replacing the Entire Control Board

This is the recommended option for most DIY homeowners attempting to repair the DVE45T3400W. A complete control board replacement eliminates the risk of soldering damage and comes with a warranty from the manufacturer or parts supplier.

DVE45T3400W Control Board Part Number: The main control board for the DVE45T3400W is commonly part number DC92-01624C or DC92-01649C (depending on board revision). Verify the exact part number on your original board or consult the DVE45T3400W service manual to ensure you order the correct version.

Cost Comparison: A replacement control board for the DVE45T3400W typically costs $150-300. When combined with the potential cost of a failed soldering attempt, the control board replacement is often the safer financial decision for DIY repair.

Steps for Control Board Replacement on the DVE45T3400W

1. Obtain the correct replacement board: Order a new DVE45T3400W control board using the part number identified above. Ensure it matches your exact dryer model.
2. With the original board removed, disconnect all remaining connections: Document every wire, connector, and harness attached to the old board with photographs or detailed notes.
3. Remove the board from its housing: Unscrew any mounting screws holding the board to the console backing plate.
4. Install the new board: Position the new board in the same orientation as the original and secure it with screws.
5. Reconnect all harnesses: Carefully reconnect each wire harness in the same configuration as it was on the original board. The connectors are typically keyed to fit only in one direction, reducing the chance of error.
6. Reassemble the console and cabinet: Follow the disassembly steps in reverse order, ensuring all screws are tight and all connections are secure.

Post-Repair Testing of Your DVE45T3400W

Initial Inspection

Before running a full test cycle on your DVE45T3400W, perform these safety checks:

• Verify all screws and fasteners are tightened on the cabinet and console.
• Confirm all wire harnesses are fully seated and locked in place.
• Check that no wires are pinched between panels.
• Ensure the top panel is fully seated and secured.

Functional Testing

Once reassembly is complete on your DVE45T3400W:

1. Plug in the dryer: Reconnect your DVE45T3400W to the electrical outlet.
2. Run a test cycle: Start a heat dry cycle (typically “Normal Dry” mode) with a small load of damp towels.
3. Monitor heating: After 2-3 minutes, carefully touch the lint trap area (not directly on the heating element housing which becomes very hot). It should be distinctly warm. Place your hand near the exhaust vent outside the dryer and feel for warm air discharge.
4. Complete the cycle: Allow the dryer to run for 10-15 minutes and assess whether clothes are drying properly.
5. Check for abnormal sounds: Listen for the relay click when the cycle starts and periodically during operation. A single click at cycle start is normal; continuous rapid clicking indicates a problem.

Temperature Testing

For more precise verification that your DVE45T3400W heating relay is functioning correctly:

1. Use an infrared thermometer: Point the thermometer at the exhaust vent of your DVE45T3400W while it’s running in heat mode.
2. Verify temperature: Exhaust air temperature should exceed 120°F (49°C) within the first few minutes of operation. Typical exhaust temperature for a functioning DVE45T3400W is between 130-160°F (54-71°C).
3. Record multiple readings: Take readings at the 3-minute mark, 5-minute mark, and 10-minute mark to ensure heat output remains consistent throughout the cycle.

Frequently Asked Questions

Can I replace just the relay on my DVE45T3400W or must I replace the entire control board?

While you can replace just the relay if you have soldering skills, for most homeowners, I recommend replacing the entire control board. Desoldering requires equipment and experience—a mistake could damage the DVE45T3400W board irreparably, potentially costing more than a full board replacement. Complete board replacement is a safer option and comes with manufacturer warranties.

What is the correct part number for the DVE45T3400W control board?

The DVE45T3400W typically uses part number DC92-01624C or DC92-01649C for the main control board, depending on the manufacturing date and revision. Always check your original board or consult the DVE45T3400W manual to confirm the exact part number before ordering. Verifying compatibility is crucial before making a purchase.

How long does it take to replace the relay on a DVE45T3400W?

Complete control board replacement on the DVE45T3400W typically takes 1-2 hours for a DIY homeowner with basic mechanical skills. This includes disassembly, board replacement, and reassembly. If you’re desoldering and replacing just the relay, add 30-60 minutes depending on your soldering proficiency.

Why is my DVE45T3400W dryer running but not heating after I replaced the relay?

If your DVE45T3400W still doesn’t heat after relay replacement, verify that all wire harnesses are fully connected to the new control board, especially the connector to the heating element circuit. Also, confirm that you installed the correct replacement board part number. Test continuity through the entire heating circuit, including the thermal fuse and high-limit thermostat, which can also prevent heating if they fail.

Can a faulty relay on the DVE45T3400W cause other problems besides no heat?

While the heating relay’s primary function is controlling heat, a relay failure on the DVE45T3400W can sometimes cause control board errors or prevent other cycles from functioning if the relay shorts and damages the board. However, most relay failures specifically result in loss of heating while other dryer functions continue normally.

Is it safe to test the relay on my DVE45T3400W with a multimeter?

Yes, testing the relay with a multimeter is safe after the DVE45T3400W is unplugged. Resistance testing and coil continuity testing carry no electrical risk. However, avoid touching other board components and discharge any residual charge before handling the board. Do not apply power to the relay coil yourself—energizing a coil on a populated control board is bench work for a technician, and the de-energized resistance and continuity checks already give you the answer you need.

Where can I find the heating relay on the DVE45T3400W control board?

The heating relay on the DVE45T3400W is located on the main control board, typically toward the center-right area when viewing the board from the front. It’s one of the larger electromechanical components and will be labeled with a designator like “RL1” or “K1” on the circuit board. Consult the DVE45T3400W service manual for the exact position if you cannot identify it visually.

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Recommended Parts & Tools

Samsung Dryer Thermal Fuse & Relay Kit

This OEM-compatible relay replacement kit is specifically designed for Samsung dryers like the DVE45T3400W and includes the exact relay component needed for this repair. Having the correct replacement relay ensures your dryer functions safely and restores proper heating cycles. Check current pricing on Amazon.

Uxcell T10 Torx Security Screwdriver Set

Samsung dryers use Torx screws to secure the front panel and internal components, making this screwdriver set essential for accessing the relay without stripping fasteners. A quality Torx set prevents damage to your dryer’s casing during disassembly. Check current pricing on Amazon.

Spares2go Dryer Lint Trap Cleaning Brush

While replacing the relay, cleaning out accumulated lint from the dryer vent and heating chamber improves efficiency and prevents future relay failures caused by overheating. This specialized brush removes stubborn lint buildup that standard cleaning tools cannot reach. Check current pricing on Amazon.

The Relay Kit That Fixes the DVE45T3400W’s No-Heat Running Cycles

If your DVE45T3400W is spinning but throwing cold air, the heating element relay on the control board has almost certainly failed. This kit gives you both the relay and thermal fuse in one order, so you’re not making a second trip to the parts supplier when you discover the fuse blew too.

What works

• The relay itself matches the Samsung board pinout exactly—no guessing about which terminals connect where on a replacement.
• Bundling the thermal fuse saves time since both components sit in the same control board cavity and you’ll often need both when the relay fails.
• Soldering a new relay onto the board is straightforward if you have basic solder skills—the pads are accessible and the component sits flat against the board.

What doesn’t

• You’ll need a soldering iron and solder—this isn’t a plug-and-play swap like replacing a thermal fuse by itself, so if you’ve never soldered before, there’s a learning curve.
• The kit doesn’t always include desoldering wick or flux, so you may need those separately to cleanly remove the old relay without damaging the board traces.

I’ve seen homeowners misdiagnose this as a heating element failure first because the symptoms look identical—but the element almost never goes bad on this model, and you’ll waste $80 on a part you don’t need. Grab Samsung Dryer Thermal Fuse & Relay Kit and confirm the relay is actually open with a continuity test before you solder.

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