Ptc relay what is

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Method 1. All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc.

Unplug your fridge. Pull your refrigerator away from the wall carefully so you can access the power cable. Avoid opening the doors to prevent it from heating up faster. Food and Drug Administration, the Food Safety and Inspection Service, and the Centers for Disease Control and Prevention Go to source If you expect your repairs to take longer than 4 hours, move your food to a different fridge or into an insulated cooler. Remove the lower back panel from your fridge to access the relay.

Look for the small access panel on the back of your fridge near the bottom. Take the plastic cover off of the relay if it has one. Look for the compressor inside your fridge, which will be a large black cylinder on either side of the machine. Locate the area on the side of the compressor that has a black plastic box on the side with wires coming out from it. Grab the top of the plastic cover and carefully pull it off of the compressor to expose the relay inside.

Your fridge may not have a plastic cover over the relay. Disconnect the wires from the relay. The PTC relay will look like a small black box attached to the side of your compressor with wires running to it. Grip the ends of the wires with a pair of needle-nose pliers and carefully pull them off the prongs of the relay. If so, loosen the screw with a screwdriver before pulling the wire out of place. Remove the relay by pulling it off of the prongs. Grab the relay on the side you just took the wires off of and carefully pull it out from the prongs on the compressor.

The relay should easily slide off of the prongs and disconnect from the compressor so you can test it. Method 2. Inspect the relay to see if it has any charred markings around the ports where it plugged into the compressor. If you see any burnt parts on the relay, then it most likely shorted and needs to be replaced.

If the relay is still intact, then continue testing it as normal. Set up your multimeter to read resistance. Put the probes in the M and S slots on the relay to check for open resistance. Locate the ports on the side of your PTC relay that have the letters M and S above them, which are usually the ports that connect to the compressor.

Put one of the probes into each slot on the relay at the same time and check the reading on your multimeter. It does not matter which probe you put into which port. Flip the relay upside-down to see if the resistance changes to ohms.

Keep the probes inside of the same ports while you turn the relay over to the opposite side. Order a replacement relay if the resistance doesn't read OL or ohms. Look for the model number listed on the side of the relay and buy an exact match for your refrigerator. Once you get the new relay, plug it into the prongs on the compressor. Reattach the wires onto the matching ports of the relay so it can turn on your compressor again. Plug the refrigerator back in to make sure the new relay works before screwing on the back panel.

Method 3. Put the probes of a multimeter on the left and right prongs of the compressor. Last updated: 4th Jun ' How a Refrigerator PTC Relay Working and Function In the refrigerant compressor using a single-phase induction motor with split phase and this motor has two internal windings that we call a rolling and start coil or auxiliary winding. We know that a single-phase motor did not start with a capacitor or starting current.

PTC relay working principle ptc means temperature coefficient of the positive thermistor, which means that there is a relay with working temperature ratio. How does a ptc relay work We know that the motor induction phase of the refrigeration compressors of the compressor and compressor motor were split than two windings, main winding I called Winding Run and auxiliary winding of the coil that is called START.

Testing of PTC Replay in refrigerator : If you use the refrigerator and then stop and start, you will notice that the compressor does not start again because the thermistor or heat relay.

This is the first step, which the visiting technician for fridge repairs in Wetherill Park will take to check the PTC relay. They will unplug your fridge to make sure it is not being powered from any source.

The duration of the test may vary. If it takes a shorter time then you can retain the foodstuff in the fridge, but if the situation is more complicated and the process is likely to take longer, then it is advisable to offload your refrigerator and stack the foodstuff somewhere else temporarily. Now, the techies would look for the small access panel at the back of the fridge at the bottom end.

They will use a screwdriver to take the holding panel off to access the relay. Now the techie will get to the compressor of your fridge, which comes in the form of a pretty fat black drum-like structure.

They will get to one end of the compressor with a small box normally made of plastic, on that side with wires jutting out. The pro will pull it off the plastic cover and that will expose the relay.