0 seconds of 3 minutes, 6 secondsVolume 0% 00:25 03:06 Refrigerators generally make clicking noises if the condenser coils are dirty or the start relay is damaged. Or maybe its going the other way around. It is located in the lower left corner of the defrost control board. Defrost Cycle Timer — The defrost cycle timer controls the time interval of the hot gas defrost after the defrost sensor closes. How Buying OEM Parts Can Save You Time and Money. To fix the issue, inspect the defrost timer, clean the drip pan, remove the frost buildup, and then turn the advance screw clockwise to reset the timer. When all things perishable go bad before theyre expected to, its time to investigate. If they are test the defrost thermostat and. Put the heater in place and mount the 2 screws that hold it in place. One of the most common signs you may notice, is that your freezer is starting to resemble an iceberg. Bad Defrost Timer on Refrigerator Part 1 of 2 - YouTube 0:00 / 8:00 Intro Bad Defrost Timer on Refrigerator Part 1 of 2 Jake Porter 26. Temperature sensors can be tested by reading the resistance (ohms) at room temperature. A defrost bimetal thermostat is a common feature of refrigerators and freezers. OWNER RICKS APPLIANCE REPAIR. If it was cooling before, it is now in defrost mode. Also, check the door gasket and replace it if worn. Defrost timer Manufacturer Number WR9X489 Defrost thermostat, L60-32, clips to evaporator Manufacturer Number WR50X122. Another telltale sign is the positioning of the defrost thermostat. The refrigerator is switched between cooling and defrost mode by a defrost timer. The defrost timer motor runs and moves the control components in the device. If the fresh food section of your refrigerator isn’t cooling properly, you could have a problem with the appliance’s thermistor or temperature sensor. You can also open the freezer and assess two signs in the. With the correct setup of the defrost control board by a qualified AC repair and installation service provider, the system works efficiently by detecting ice build-up on the. Loud noises coming from the back of the unit could indicate an issue with the defrost timer, condenser fan, or compressor. If there is no continuity on one of the parts then it is bad and would need replaced. After 8 hours of runtime power is switched to. Average delivery time for in-stock parts via standard shipping: 1. Need help replacing the Defrost Timer (Part # WR9X502) in your GE Refrigerator? Watch this how-to video with simple, step-by-step instructions for a successf. Compressor Is Malfunctioning GE Refrigerator Does Not Defrost – Solutions. One critical component of a heat pump system is the defrost control board. Now, clip the ground wire clip onto the panel again. Defrost Cycle Timer — The defrost cycle timer controls the time interval of the hot gas defrost. Need help replacing the Defrost Timer - 120V (Part #297318010) in your Frigidaire Freezer? Watch this how to video with simple, step-by-step instructions for. If your refrigerator is stuck in defrost mode and always seems to be defrosting, check the entire defrost system, especially the timer. It is possible the unit goes into defrost too often and/or for too long. Manufacturer Part Number 5304518034. Frost build-up is a common symptom of a bad defrost timer. If the defrost timer is defective, it may not advance into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle. Identifying Which One of the Three Defrost Components is Bad: Defrost heater is good if it has continuity between the leads and no continuity to ground. What causes defrost problem in a refrigerator?. Within the first 15 minutes of your vehicle’s engine running, the temperature gauge will read high into the red, which could be the most alarming symptom. Take the new defrost heater and attach the wires to both ends of it. The electronic control board monitors the thermistor and controls the refrigerator temperature based. Faulty defrost timer– On models with a defrost timer, the timer could fail to advance into the defrost cycle or be able to send voltage to the heater during the cycle. If there is no continuity on one of the parts then it is bad and would need replaced. When you look at the refrigerator drip pan, you are only supposed to see small 3. Remove all the screws you find and pull the timer carefully out of the refrigerator. Would this seem to indicate defrost board or low refrigerant. If the timer does not advance, the appliance will be stuck. Your model doesnt use a defrost timer. The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. Set your multi-meter to the Rx1 setting and touch one probe to the common terminal (it should be labeled 3 or C). Force the board into a defrost and check for 24v between W2 and C at the outside board to confirm proper operation, or check the secondary heat via an ammeter or visual confirmation during the defrost cycle. The temperature is changing erratically. If the timer does not advance, the appliance will be stuck either in defrost or refrigerate mode, resulting in, respectively, no cooling or frost build-up. If your refrigerator is running too long, it could be due to a malfunction of the defrost termination thermostat. Bad defrost timer symptoms can include an overflowing drip pan, excessive frost on the coils, and/or irregular temperature readings in the fridge. This is the component in charge of turning off the defrost heater at the end of the defrost cycle, when the evaporator gets up to 35 to 47 degrees F. Troubleshooting the Defrost Timer in a Kenmore Elite>Troubleshooting the Defrost Timer in a Kenmore Elite. Refrigerator Not Defrosting: Top 6 Reasons & How to Fix (With …. Turn off your power, and then remove the wiring from the thermostat, and connect them to your defrost heater. Locate & remove the defrost timer from the appliance in order to test it. Signs of a problem can include: An occasional or persistent noise that comes from the part, or inconsistent defrost; It runs at some times but not others, which causes frost to build up on the gears or bearings and the timer stops rotating. You can also open the freezer and assess two signs in the freezer by seeing if the freezer is too warm or by looking at the freezer coils and identifying any frost buildup. ANSWER Cory, To determine whether the defrost timer is faulty, you would want to see if the evaporator coils are impacted with ice. To test whether the defrost timer is simply failing to advance, locate the advance screw and turn it clockwise until you hear it click. Unplug the refrigerator and look for 4 terminals that are attached to the defrost timer. Replace your defrost timer or the start relay if they are damaged because you cannot repair them. Refrigerant flooding into the compressor. The defrost termination switch (thermostat) is good if it has continuity when cooled below 40 degrees. Foreign material in the valve’s orifice. Start with the defrost timer and move to other components of the system. Refrigerator Making Clicking Noises? (Possible Causes & Fixes)>Refrigerator Making Clicking Noises? (Possible Causes & Fixes). Furthermore, check the door hinge, especially if the unit is a recent installation or you recently had to remove the door. Here’s how to test your appliance’s defrost timer: Start by. Consult the user manual to determine the exact location of the timer in your specific model. Identifying Which One of the Three Defrost Components is Bad: Defrost heater is good if it has continuity between the leads and no continuity to ground. Leave the other wires connected to the timer so theyre out of the way. You should always test your refrigerator defrost timer before resetting it, simply because this is the only way to make sure that the timer is the issue. If your refrigerator is running too long, it could be due to a malfunction of the defrost termination thermostat. If the heater comes on there is no need for. It is possible the heat strips are undersized -- it is a new construction house. To determine if the defrost timer is defective. As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. If you notice a large amount of ice has built up on or around the motor, allow your freezer to defrost and see if that resolves the issue. This promotes more efficient exchange of heat across the evaporator. If the defrost timer has gone bad, your appliance’s evaporator may freeze up, preventing cold air from moving through the unit. Signs Of Bad Defrost TimerSigns of a Problematic Defrost Control System Ice on the Refrigerant Coils The first sign of a failed to defrost control board is ice covering the refrigerant coils. Sometimes when it goes bad, the full evaporator will become encased in ice. This mechanical timer switches between the cooling circuit and the defrost circuit. If the defrost sensor fuse blows, the. If the defrost timer has gone bad, your appliance’s evaporator may freeze up, preventing cold air from moving through the unit. This advances it to the next mode. The delta is often only a few degrees, but will increase briefly to 15+ degrees. Bad Defrost Timer on Refrigerator Part 1 of 2 - YouTube 0:00 / 8:00 Intro Bad Defrost Timer on Refrigerator Part 1 of 2 Jake Porter 26. Signs of a problem can include: An occasional or persistent noise that comes from the part, or inconsistent defrost; It runs at some times but not others, which causes frost to build up on the gears or bearings and the timer stops rotating. Need help replacing the Defrost Timer - 120V (Part #297318010) in your Frigidaire Freezer? Watch this how to video with simple, step-by-step instructions for a successful DIY repair. 3K subscribers 373K views 6 years ago #defrost. Received 3,430 Upvotes on 3,076 Posts. Try slowly advancing the timer dial into the defrost cycle. Bad defrost timer symptoms can include an overflowing drip pan, excessive frost on the coils, and/or irregular temperature readings in the fridge. 05 - GE Refrigerator Defrost Sensor with Fuse. This device helps to keep temperatures down in refrigeration systems. Refrigerator Thermostat: Signs of Malfunction One jug of milk turning sour before its best by date is bad luck, but a pattern of sour-too-soon milk indicates somethings going wrong. 0:00 / 5:55 Intro How to Test your Defrost Timer Bill Newberry 165K subscribers 781K views 9 years ago Refrigerator Repair Videos Video describing how to test the defrost timer on your. This should automatically trigger a warming of the freezer section. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. Very easy repair on Frigidaire freezer. Need help replacing the Defrost Timer - 120V (Part #297318010) in your Frigidaire Freezer? Watch this how to video with simple, step-by-step instructions for. Connect the common wire and the compressor wire together and that will cause the compressor to run 100% of the time unless the thermostat turns it off or you manually turn it off, completely by-passing the defrost timer. Need help replacing the Defrost Timer (Part # WR9X502) in your GE Refrigerator? Watch this how-to video with simple, step-by-step instructions for a successf. Be sure to position the panel properly before mounting the screws. eHdHA- referrerpolicy=origin target=_blank>See full list on ufixit. The basic components in this system include a defrost heater, a defrost thermostat, and a defrost control. Refrigerator manufacturers choose constant run defrost timers or accumulative defrost timers that operate on 6-, 12- or 24-hour intervals. If the heater fails to operate, frost will become ice leading to ventilation problems. While you obviously want a freezerto keep your food in its intended frozen state, it’s not normal for. Defrost timers are typically at the back of the fridge and you’ll need to pull the unit away from the wall to access it. It can be found behind the refrigerators lower kickplate, in the refrigerators control panel, or even behind the refrigerator on its back wall. If the defrost system in your Maytag refrigerator is not working, the first step is to check the defrost system. When a defrost bimetal thermostat isnt working properly, a refrigerator/freezer will have to work harder to keep things cool. If they are test the defrost thermostat and defrost heater for continuity. Signs of a Problematic Defrost Control System Ice on the Refrigerant Coils The first sign of a failed to defrost control board is ice covering the refrigerant coils. If the defrost system in your Maytag refrigerator is not working, the first step is to check the defrost system. Compressor Is Malfunctioning GE Refrigerator Does Not Defrost – Solutions. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. If you notice a large amount of ice has built up on or around the motor, allow your freezer to defrost and see if that resolves the issue. If they are test the defrost thermostat and defrost heater for continuity. If the defrost timer seems hot to the touch or is noisy ( like a ticking or screeching noise )replace it. Your model doesnt use a defrost timer. Main Control Board Is Damaged 8. 0:00 / 5:55 Intro How to Test your Defrost Timer Bill Newberry 165K subscribers 781K views 9 years ago Refrigerator Repair Videos Video describing how to test the defrost timer on your. Remove all the screws you find and pull the timer carefully out of the refrigerator. If the bimetal thermostat fails to function, the refrigerator or. Pull it out far enough so that you can disconnect its wires. A defrost bimetal thermostat is a common feature of refrigerators and freezers. The main sign would be if you open your fridge and notice that your Kenmore Elite refrigerator is not cooling. Heat Pump Not Defrosting – Troubleshooting Guide. That model was manufactured by Amana and theyre known for bad compressors and restrictions. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. The defrost thermostat senses the temperature of cooling coils. The defrost timer motor runs and moves the control components in the device. As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. com/_ylt=AwrFEgUvfVVkfEgXD05XNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1683353008/RO=10/RU=https%3a%2f%2fwww. The work of the defrost system is to remove the ice on coils by using the defrost heater to heat the coils to melt them. The compressor should shut off and the heater should turn on. The basic components in this system include a defrost heater, a defrost thermostat, and a defrost control. Turn off your power, and then remove the wiring from the thermostat, and connect them to your defrost heater. Wait 10-20 minutes to see if the defrost heater has come on. That model was manufactured by Amana and theyre known for bad compressors and restrictions. 0:00 / 5:55 Intro How to Test your Defrost Timer Bill Newberry 165K subscribers 781K views 9 years ago Refrigerator Repair Videos Video describing how to test the defrost timer on your. The defrost sensor monitors the temperature of the evaporator. Refrigerator manufacturers choose constant run defrost timers or accumulative defrost timers that operate on 6-, 12- or 24-hour intervals. One critical component of a heat pump system is the defrost control board. What are the signs of a bad thermostat? Symptoms of a Faulty or Bad Thermostat The temperature gauge is very high, and the engine is overheating. Average delivery time for in-stock parts via standard shipping: 1. Why isnt my freezer cooling?. Troubleshooting Defrost Timers & Unit Coolers. If it goes bad and stops cooling mode, the evaporator coils are filled with excessive frost, which reduces air. What are the symptoms of a bad defrost timer, and where is it …. A defrost timer turns the heater on for a duration of about 25 minutes two or three times a day to prevent the evaporator coils from frosting over. Symptoms of a Bad Refrigerator Thermostat. The delta is often only a few degrees, but will increase briefly to 15+ degrees. What are the signs of a bad thermostat? Symptoms of a Faulty or Bad Thermostat The temperature gauge is very high, and the engine is overheating. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. GE Refrigerator Not Defrosting? Defrost Timer Replacement #. How to Tell Whether Your TXV is Bad. If there is ice building up in this area, it can indicate that the part has gone bad. A defrost timer turns the heater on for a duration of about 25 minutes two or three times a day to prevent the evaporator coils from frosting over. This is the component in charge of turning off the defrost heater at the end of the defrost cycle, when the evaporator gets up to 35 to 47 degrees F. Refrigerator Not Defrosting? Defrost Timer Replacement # >GE Refrigerator Not Defrosting? Defrost Timer Replacement #. Higher than normal discharge temperatures Low condensing pressure Low condenser split Normal to high condenser subcooling A partially-closed valve Wax buildup caused by using the wrong oil in the unit Refrigerant flooding into the compressor Excessive oil in the system Foreign material in the valve’s orifice. Locate Defrost Timer And Shut Off the Power. Refrigerator Thermostat: Signs of Malfunction One jug of milk turning sour before its best by date is bad luck, but a pattern of sour-too-soon milk indicates somethings going wrong. When the control contacts in the defrost timer advance into the defrost cycle, the compressor stops and the defrost heater turns on for a specified period of time to melt frost off of the evaporator fins. If the thermostat is defective it may not be able to sense the temperature of coils and then wont turn on the defrost heater. Locate & remove the defrost timer from the appliance in order to test it. Palczewski four times earned. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. Your model doesnt use a defrost timer. A failed evaporator fan can also cause cooling problems because it wont circulate air through the freezer cabinet. Simply wait about 35 minutes and check whether it has left defrost mode and has resumed cooling (listen for the compressor. Matt Akins is ACCAs Manager of HVACR Education. Another telltale sign is the positioning of the defrost thermostat. What are the signs of a bad thermostat? Symptoms of a Faulty or Bad Thermostat The temperature gauge is very high, and the engine is overheating. Six Steps to Fix a Refrigerator Making Loud Noise. What are the symptoms of a bad defrost timer, and where is it. Wait 10-20 minutes to see if the defrost heater has come on. The defrost timer may need to be replaced if the fridge will not maintain its temperature or has frost buildup. Replace your defrost timer or the start relay if they. The defrost timer may need to be replaced if the fridge will not maintain its temperature or has frost buildup. Why Does My GE Freezer Keep Defrosting? 1. If the heater fails to operate, frost will become ice leading to ventilation problems. Heat Pump Not Defrosting – Troubleshooting Guide>Heat Pump Not Defrosting – Troubleshooting Guide. If the defrost sensor trips because its not working correctly, frost builds up on the evaporator fins, eventually making the refrigerator and freezer not cool well. The defrost timer may need to be replaced if the fridge will not maintain its temperature or has frost buildup. Typically, it should be in the control panel, behind the toe grille. Understanding a Defrost Board on a Heat Pump. Each model is designed differently, so it may be hard finding it at first. However, if after 20 minutes the freezer still has not begun to defrost, then you will need to remove the back wall, and look at the thermostat itself. The defrost control board has a pin selection for 30,60 and 90 minutes between defrost. Denver Broncos sign Illini OL Alex Palczewski as undrafted free …. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. Signs of a Problematic Defrost Control System Ice on the Refrigerant Coils The first sign of a failed to defrost control board is ice covering the refrigerant coils. A bad defrost thermostat, sensor, timer, a bad relay, a stuck reversing valve, a bad motor, an inefficient fan, a stuck fan, or just anything of the like could be harming your heat pump defrosting process. One critical component of a heat pump system is the defrost control board. Connect the common wire and the compressor wire together and that will cause the compressor to run 100% of the time unless the thermostat turns it off or you manually turn it off, completely by-passing the defrost timer. As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. Higher than normal discharge temperatures Low condensing pressure Low condenser split Normal to high condenser subcooling A partially-closed valve Wax buildup caused by using the wrong oil in the unit Refrigerant flooding into the compressor Excessive oil in the system Foreign material in the valve’s orifice. Bad Defrost Timer on Refrigerator Part 1 of 2 - YouTube 0:00 / 8:00 Intro Bad Defrost Timer on Refrigerator Part 1 of 2 Jake Porter 26. Schedule maintenance HVAC problems? Get Free Quotes Today!. Locate & remove the defrost timer from the appliance in order to test it. Would this seem to indicate defrost board or low refrigerant. To fix the issue, inspect the defrost timer, clean the drip pan, remove the frost buildup, and then turn the advance screw clockwise to reset the timer. Its critical to test this function on heat pumps to reduce cold draft complaints during the winter. Why Does My GE Freezer Keep Defrosting? 1. Time involved (including defrosting drain line) was about two hours. Received 3,430 Upvotes on 3,076 Posts. GE Refrigerator Repair. Usually, when this part is bad, the refrigerator will be slightly warmer than the freezer. Bad defrost timer symptoms can include an overflowing drip pan, excessive frost on the coils, and/or irregular temperature readings in the fridge. Refrigerant flooding into the compressor. A bad defrost thermostat, sensor, timer, a bad relay, a stuck reversing valve, a bad motor, an inefficient fan, a stuck fan, or just anything of the like could be harming your heat pump defrosting process. A low pressure reading at the suction service valve. Pull firmly on the wires connectors to remove them. If the defrost timer is. 05 - GE Refrigerator Defrost Sensor with Fuse. Excessive Ice Buildup Ice buildup in the freezer cabinet is an indication that the auto defrost system is not working. The electronic control board monitors the thermistor and controls the refrigerator temperature based on thermistor signals. The defrost heater is located behind the evaporator which is located behind an access panel to the rear of the freezer. Need help replacing the Defrost Timer (Part # WR9X502) in your GE Refrigerator? Watch this how-to video with simple, step-by-step instructions for a successf. The motor coil burns out and becomes an open circuit, and the timer stops rotating. 5 Reasons Why a Refrigerator Won’t Defrost. com%2fdiy-tips%2frefrigerator-defrost-problems%2f/RK=2/RS=Z1_VtmIwBoDFQkfpC2B5j. 262K views 11 years ago This video provides step-by-step instructions for replacing the defrost timer on General Electric refrigerators. Steps To Fix Bad Defrost Timer Symptoms 1. Heater-Defrost element, defrost thermostat, & timer, defrost. If you notice the signs of a malfunctioning timer, then it may be time to reset your defrost timer. Eventually, this will lead to a warmer freezer, which is another symptom of a failed defrost heater. If your refrigerator is running too long, it could be due to a malfunction of the defrost termination thermostat. If this is your problem, then you should immediately place the defrost timer onto manual defrost. Reset Defrost Button Timer. Next, fix the rear panel and mount the holding screws again. The focus of this blog is the defrost control board in the heat pumps that has three components: defrost heater, a termination switch and timer, and the control board. Three interval settings are available: 30 minutes, 60 minutes, and 90 minutes. 9 Obvious Signs You Need a New Refrigerator. Repair Time Estimate. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater and defrost thermostat. Remove all the screws you find and pull the timer carefully out of the. Frozen freezer drain Leonard M. Sludge left over from a burnt-out compressor. The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. What are the symptoms of a bad defrost timer, and where is it located. Depending on the model, the control may be a defrost timer or a defrost control board. Wait 10-20 minutes to see if the defrost heater has come on. When the cooling coils become cold enough, thermostat sends signal to defrost heater to turn on. It uses an adaptive defrost control board and there is no reset on the board. Identifying Which One of the Three Defrost Components is Bad: Defrost heater is good if it has continuity between the leads and no continuity to ground. What are the symptoms of a bad defrost thermostat?. By Joey Wagner Apr 29, 6:19 PM. When your refrigerator or freezer is cold, the defrost thermostat should be set to the closed position. Check to make sure the thermostat is working properly by making sure that the thermostat opens at the right temperature. The most common reason for replacing the defrost. A 6-hour interval timer means that the refrigerator. Depending on the model, it could be located on the rear panel or ceiling of the fresh food compartment. Refrigerator Thermostat: Signs of Malfunction One jug of milk turning sour before its best by date is bad luck, but a pattern of sour-too-soon milk indicates somethings going wrong. The motor coil burns out and becomes an open circuit, and the timer stops rotating. The basic components in this system include a defrost heater, a defrost thermostat, and a defrost control. Top 5 Reasons Why a Refrigerator Won’t Defrost. Heat Pump Defrost: Diagnosis. How to test a refrigerator defrost timer. Signs of a problem can include: An occasional or persistent noise that comes from the part, or inconsistent defrost; It runs at some times but not others, which causes frost to build. Your fan should kick in shortly after showing signs that the reset was successful. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater and defrost thermostat. ANSWER Cory, To determine whether the defrost timer is faulty, you would want to see if the evaporator coils are impacted with ice. Excessive Frost On The Coils. How To Repair A Refrigerator That Wont Stop Running. Faulty defrost timer– On models with a defrost timer, the timer could fail to advance into the defrost cycle or be able to send voltage to the heater during the cycle. Temperature Control Thermostat Is Faulty 7. This should be easily managed when you are looking at the thermostat, the wires will be evident. after the defrost sensor closes. #Shorts Many top freezer refrigerators use a defrost timer. If the defrost timer doesnt advance through the automatic defrost cycle and allow the compressor to start after 30-45 minutes, its likely the timer is broken and needs to be replaced. A defrost bimetal thermostat is a common feature of refrigerators and freezers. When the cooling coils become cold enough, thermostat sends signal to defrost heater to turn on. A Refrigerator Thats Running Too Long. Refrigerator Not Defrosting: Top 6 Reasons & How to Fix (With. Usually, when this part is bad, the refrigerator will be slightly warmer than the freezer. What kind of issue are you having that caused you to replace the relay/overload? OWNER RICKS APPLIANCE REPAIR. When your refrigerator or freezer is cold, the defrost thermostat should be set to the closed position. PartSelect Number PS12585793. Steps To Fix Bad Defrost Timer Symptoms 1. The defrost sensor has a fuse to back up the sensor in case the sensor fails. Reset Defrost Button Timer. Refrigerator or Freezer Thats Too Warm: Top 6 Reasons and …. This blog article by ACCA’s Matt Akins will take you through the essential operation of a defrost control board and some basic troubleshooting. 5 Reasons Why Your GE Refrigerator is Not Defrosting. Depending on the model, the control may be a defrost timer or a defrost control board. Need help replacing the Defrost Timer - 120V (Part #297318010) in your Frigidaire Freezer? Watch this how to video with simple, step-by-step instructions for a successful DIY repair. You should also inspect the fan and motor for any signs of wear or damage, removing any foreign objects in the area. The defrost cycle will fail if the defrost heater is bad.