How to Test a Refrigerator Relay Switch

by:KEBO      2019-12-08
The refrigerator needs a compressor to keep the inside cold.The thermostat inside the refrigerator tells the compressor when to turn on and off to maintain a safe cooling level.When the temperature inside the refrigerator is higher than the current thermostat setting, the thermostat sends an electrical signal to the relay switch to start the compressor.If the temperature inside the device starts to rise and you hear a clicking sound coming under the refrigerator, this may be a compressor relay switch failure.Test the refrigerator relay switch to determine if a replacement is required.Remove the refrigerator from the wall to enter the rear of the device.Disconnect the refrigerator power cord from the wall socket.Turn off the water supply of the ice maker and remove the water supply pipe from the water valve using an adjustable wrench.Put the end of the supply line into the container to capture any water in the line.Unscrew the connector that holds the access panel to the back of the bottom of the refrigerator.Remove the access panel from the device.Along the wire on the side of the compressor find the metal junction box connected to both sides of the refrigerator compressor.Grab the terminal box cover with your finger and unplug it from the box to access the relay switch.Unplug the bus connector from the male terminal on the side of the relay switch.Grab the relay with your fingers.Pull it out of the junction box and disconnect the two master terminals from the fixed male terminals inside the box.Look for any corrosion on the copper winding.Use a brush to remove any visible corrosion.Place the relay in the position of the two female terminals on the working surface, and the female terminal is facing down on the side.If your refrigerator relay switch is a solid-state plastic without a copper winding, it is considered a solid-state relay.Test it by shaking the solid state relay.If it sounds like there is something ringing inside, the relay is damaged and needs to be replaced.Continue to test the copper winding relay.The failure of any of the following tests indicates that the relay is defective and needs to be replaced.Adjust the dial on the multimeter to \"Ohm x1 \".\"Insert the two probes on the multimeter into the two master terminals on the relay.The display on the digital multimeter should be zero, or the needle should sweep through the surface of the monitor and be zero at the far right on the analog multimeter.Flip the relay and leave the probe in the relay.The needle should be moved to the far left of the analog multimeter, the \"1\" of the digital meter \".Turn the relay back to its original position.Leave the red probe at the female terminal on the left.Touch the male terminal with a black probe.The display on the digital multimeter should read zero, or the needle should be swept to zero on the analog multimeter.Flip the relay to maintain the position of the probe.The needle should be moved to the far left of the analog multimeter, and the display of the digital meter should appear \"1 \".Return the relay to its original position.Insert the red probe into the female terminal on the right.Let the Black probe touch the male terminal.The analog multimeter needle should be swept to the far right of the display;\"0\" should appear on the digital display \".Turn the relay again with the probe in place.The digital meter should display \"0\" and the analog meter should be scanned to the leftmost.
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