How to test the relay control board on a Samsung electric range

When your Samsung electric range isn’t heating up properly or the burners aren’t functioning, the issue could be with the relay control board. This part manages the flow of electricity to the various parts on your range. If the relay control board is malfunctioning, it can cause a wide range of problems.

Fortunately, testing the relay control board is a relatively straightforward process that any handy homeowner can undertake. By following the steps outlined in this guide, you’ll be able to diagnose whether the control board is the root cause of your range’s issues and determine if it needs to be replaced. This can save you the cost and inconvenience of calling in a professional repair technician.

If you find out that you need any replacement parts for your appliance, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

The troubleshooting information in this article is based on general service manuals and may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

Tools and materials

• Phillips head screwdriver
• Multimeter

The specific tools required may vary depending on the model of your appliance and the type of fasteners used on it. Always consult the user manual or refer to any specific instructions provided by the manufacturer for the recommended tools for your appliance model.

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind: 

• Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with bare wet hands. Make sure the work area is completely dry.
• Check your user manual to see if there are specific installation or safety instructions for your part or appliance. 
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it. 
• Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.

Testing steps

Step 1: Access the relay control board:

1. Pull out the range and remove the screws to take off the rear panel.
2. Locate the relay control board about halfway down on the right side, just above the terminal block.

Step 2: Test the CN04 connector:

1. Set the control panel to bake mode.
2. Use a multimeter set to measure DC Volts.
3. Test between the orange and blue wires of the CN04 connector.
4. You should measure 4.7 VDC, indicating the main control board is sending signal voltage to the relay board.

Step 3: Test the CN05 connector:

1. Use the multimeter still set to measure DC Volts.
2. Test between the black and white wires of the CN05 connector.
3. You should measure 3.85 VDC, indicating the main control board is sending signal voltage to the relay board.

Step 4: Test the CN01 connector:

1. This connector controls the lock motor, oven lamp, convection fan, door switch, and warming center.
2. Lock motor test: Set the oven to self-clean mode and measure 120 VAC between the yellow wire and chassis ground or the white wire on the CN09 connector.
3. Oven lamp test: Turn the oven light on and measure 120 VAC between the oven lamp wire on CN01 and chassis ground or the white wire on CN09.
4. Convection fan test: Set the oven to convection bake and measure 120 VAC between the convection fan wire on CN01 and chassis ground or the white wire on CN09.
5. Door switch test: Measure 120 VAC between the door switch wire on CN01 and chassis ground when the door is closed.
6. Warming center test: Turn the warming center on and measure 120 VAC between the warming center wire on CN01 and chassis ground or the white wire on CN09.

Step 5: Test the Iindividual terminals:

1. T03 (warming drawer power out): Measure 120 VAC between the T03 terminal and chassis ground with the warming drawer turned on.
2. T02 (convection heater out): Measure 120 VAC between the T02 terminal and chassis ground.
3. T01 (voltage in): Measure 120 VAC between the T01 terminal and chassis ground.

Step 6: Test the relays:

1. RY3 (broil relay): Measure 120 VAC between the brown wire (L1 in) and chassis ground, and between the black wire (L1 out) and chassis ground.
2. RY4 (bake relay): Measure 120 VAC between the gray wire (L1 in) and chassis ground, and between the yellow wire (L1 out) and chassis ground.
3. RY2 (convection relay): Measure 120 VAC between the red wire (L1 in) and chassis ground, and between the blue wire (L1 out) and chassis ground.

If any part of the relay control board is found to be faulty, the entire relay control board will need to be replaced.

Additional information

Thank you for reading! We hope this guide helped you get your Samsung range working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos. 

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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