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. Check the internal area to make sure these components are in good state. Loud noises coming from the back of the unit could indicate an issue with the defrost timer, condenser fan, or compressor. Would this seem to indicate defrost board or low refrigerant. If there is ice building up in this area, it can indicate that the part has gone bad. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. Heat Pump Not Defrosting – Troubleshooting Guide>Heat Pump Not Defrosting – Troubleshooting Guide. 05 - GE Refrigerator Defrost Sensor with Fuse. If the heater fails to operate, frost will become ice leading to ventilation problems. Set your multi-meter to the Rx1 setting and touch one probe to the common terminal (it should be labeled 3 or C). Wait 10-20 minutes to see if the defrost heater has come on. Next, fix the rear panel and mount the holding screws again. 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. If the defrost timer has gone bad, your appliance’s evaporator may freeze up, preventing cold air from moving through the unit. 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. 3K subscribers 373K views 6 years ago #defrost. If there is ice building up in this area, it can indicate that the part has gone bad. Main Control Board Is Damaged 8. Frost build-up is a common symptom of a bad defrost timer. It is located in the lower left corner of the defrost control board. Six Steps to Fix a Refrigerator Making Loud Noise. Wait 10-20 minutes to see if the defrost heater has come on. Received 3,430 Upvotes on 3,076 Posts. OWNER RICKS APPLIANCE REPAIR. When your refrigerator or freezer is cold, the defrost thermostat should be set to the closed position. The basic components in this system include a defrost heater, a defrost thermostat, and a defrost control. If the defrost timer has gone bad, your appliance’s evaporator may freeze up, preventing cold air from moving through the unit. What are the symptoms of a bad defrost thermostat?. If you notice the signs of a malfunctioning timer, then it may be time to reset your defrost timer. PartSelect Number PS12585793. 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. The defrost cycle will fail if the defrost heater is bad. Refrigerator Making Clicking Noises? (Possible Causes & Fixes). 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. 9 Obvious Signs You Need a New Refrigerator. A Refrigerator Thats Running Too Long. 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. Defrost timer Manufacturer Number WR9X489 Defrost thermostat, L60-32, clips to evaporator Manufacturer Number WR50X122. Depending on the model, it could be located on the rear panel or ceiling of the fresh food compartment. 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. One critical component of a heat pump system is the defrost control board. 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. Refrigerator Not Defrosting: Top 6 Reasons & How to Fix (With. The defrost termination switch (thermostat) is good if it has continuity when cooled below 40 degrees. Manufacturer Part Number 5304518034. The most common reason for replacing the defrost. Sometimes when it goes bad, the full evaporator will become encased in ice. Understanding a Defrost Board on a Heat Pump. The motor coil burns out and becomes an open circuit, and the timer stops rotating. This should be easily managed when you are looking at the thermostat, the wires will be evident. If the defrost system in your Maytag refrigerator is not working, the first step is to check the defrost system. Diagnosing refrigerator thermistor problems video. If the timer does not advance, the appliance will be stuck. 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 heater is located behind the evaporator which is located behind an access panel to the rear of the freezer. How to Troubleshoot & Replace Frigidaire AP6799886 / 5304518034 Defrost. Refrigerator manufacturers choose constant run defrost timers or accumulative defrost timers that operate on 6-, 12- or 24-hour intervals. When all things perishable go bad. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. 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. Consult the user manual to determine the exact location of the timer in your specific model. When you look at the refrigerator drip pan, you are only supposed to see small 3. 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. If this is your problem, then you should immediately place the defrost timer onto manual defrost. Usually, when this part is bad, the refrigerator will be slightly warmer than the freezer. You can also open the freezer and assess two signs in the. Temperature sensors can be tested by reading the resistance (ohms) at room temperature. It is possible the unit goes into defrost too often and/or for too long. Eventually, this will lead to a warmer freezer, which is another symptom of a failed defrost heater. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. to bypass basic timer? (defrost timer). 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. The compressor should shut off and the heater should turn on. What are the symptoms of a bad defrost thermostat. How To Fix A Refrigerator Thats Running Too Long. A low pressure reading at the suction service valve. Why is frost building up in my refrigerators freezer?. It is possible the unit goes into defrost too often and/or for too long. How a Refrigerator Defrost Timer Works. In most cases the problem is a defective defrost timer. Remove all the screws you find and pull the timer carefully out of the refrigerator. Top 5 Reasons Why a Refrigerator Won’t Defrost. Pull it out far enough so that you can disconnect its wires. Be sure to position the panel properly before mounting the screws. The defrost timer may need to be replaced if the fridge will not maintain its temperature or has frost buildup. 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. If your refrigerator is stuck in defrost mode and always seems to be defrosting, check the entire defrost system, especially the timer. 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. Locate & remove the defrost timer from the appliance in order to test it. Frost build-up is a common symptom of a bad defrost timer. Refrigerator or Freezer Thats Too Warm: Top 6 Reasons and …. Why isnt my freezer cooling?. If the defrost sensor fuse blows, the. If your refrigerator is running too long, it could be due to a malfunction of the defrost termination thermostat. Foreign material in the valve’s orifice. Why isnt my refrigerator cooling well?. What causes defrost problem in a refrigerator?. The electronic control board monitors the thermistor and controls the refrigerator temperature based. Denver Broncos sign Illini OL Alex Palczewski as undrafted free …. 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. Furthermore, check the door hinge, especially if the unit is a recent installation or you recently had to remove the door. Average delivery time for in-stock parts via standard shipping: 1. 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. #Shorts Many top freezer refrigerators use a defrost timer. Would this seem to indicate defrost board or low refrigerant. 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. com/_ylt=AwrFEgUvfVVkfEgXD05XNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1683353008/RO=10/RU=https%3a%2f%2fwww. This blog article by ACCA’s Matt Akins will take you through the essential operation of a defrost control board and some basic troubleshooting. Its critical to test this function on heat pumps to reduce cold draft complaints during the winter. If the heater comes on there is no need for. Your fan should kick in shortly after showing signs that the reset was successful. If the heater comes on there is no need for further diagnostics; you will need to replace the defrost timer. While you obviously want a freezerto keep your food in its intended frozen state, it’s not normal for. Wait 10-20 minutes to see if the defrost heater has come on. If the thermostat is defective it may not be able to sense the temperature of coils and then wont turn on the defrost heater. 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. Another telltale sign is the positioning of the defrost thermostat. Heater-Defrost element, defrost thermostat, & timer, defrost. #Shorts Many top freezer refrigerators use a defrost timer. What are the symptoms of a bad defrost timer, and where is it …. Typically, it should be in the control panel, behind the toe grille. The defrost termination switch (thermostat) is good if it has continuity when cooled below 40 degrees. When the specified period of defrost ends, the defrost timer contacts switch back to allow normal cooling operation in the refrigerator. Troubleshooting a Defrost Thermostat. 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. Turn off your power, and then remove the wiring from the thermostat, and connect them to your defrost heater. Heat Pump Not Defrosting – Troubleshooting Guide. Why Does My GE Freezer Keep Defrosting? 1. Each model is designed differently, so it may be hard finding it at first. If the defrost system in your Maytag refrigerator is not working, the first step is to check the defrost system. 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. The basic components in this system include a defrost heater, a defrost thermostat, and a defrost control. 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. To reset the refrigerator defrost timer, Tepte simply states to locate the circular notch on the timer and turn it counterclockwise with a flathead screwdriver. How Buying OEM Parts Can Save You Time and Money. The delta is often only a few degrees, but will increase briefly to 15+ degrees. Start with the defrost timer and move to other components of the system. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. Unplug the refrigerator and look for 4 terminals that are attached to the defrost timer. How to Test a Fridge Defrost Timer. 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. Now, clip the ground wire clip onto the panel again. 262K views 11 years ago This video provides step-by-step instructions for replacing the defrost timer on General Electric refrigerators. What kind of issue are you having that caused you to replace the relay/overload? OWNER RICKS APPLIANCE REPAIR. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater and defrost thermostat. Defrost Cycle Timer — The defrost cycle timer controls the time interval of the hot gas defrost after the defrost sensor closes. Your model doesnt use a 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 up on the gears or bearings and the timer stops rotating. This device helps to keep temperatures down in refrigeration systems. Locate & remove the defrost timer from the appliance in order to test it. 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. Illinois offensive lineman Alex Palczewski is signing with the Denver Broncos as an undrafted free agent, he told Illini Inquirer. Overflowing Refrigerator Drip Pan. 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. ANSWER Cory, To determine whether the defrost timer is faulty, you would want to see if the evaporator coils are impacted with ice. Signs Of Heat Pump Defrost Control Issues, How To Prevent Them, And. Check to make sure the thermostat is working properly by making sure that the thermostat opens at the right temperature. It needs to be turned until the fan stops, which means your fridge has reset the defrost button. the Defrost Timer>GE Refrigerator Repair. Locate & remove the defrost timer from the appliance in order to test it. If the defrost timer is. GE Refrigerator not defrosting. Simply wait about 35 minutes and check whether it has left defrost mode and has resumed cooling (listen for the compressor. 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. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. Heat Pump Defrost Boards and W2. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. • San Antonio, TX • July 16, 2018 My Repair & Advice. 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. 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. 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. The defrost timer motor runs and moves the control components in the device. Troubleshooting the Defrost Timer in a Kenmore Elite. Or maybe its going the other way around. If the defrost timer seems hot to the touch or is noisy ( like a ticking or screeching noise )replace it. The defrost thermostat senses the temperature of cooling coils. 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. 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. It uses an adaptive defrost control board and there is no reset on the board. The refrigerator is switched between cooling and defrost mode by a defrost timer. Sludge left over from a burnt-out compressor. Try slowly advancing the timer dial into the defrost cycle. Temperature Control Thermostat Is Faulty 7. Signs Of Bad Defrost TimerA defrost bimetal thermostat is a common feature of refrigerators and freezers. If there is no continuity on one of the parts then it is bad and would need replaced. 5 Reasons Why Your GE Refrigerator is Not Defrosting. 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. This advances it to the next mode. One of the most common signs you may notice, is that your freezer is starting to resemble an iceberg. When a defrost bimetal thermostat isnt working. Replace your defrost timer or the start relay if they are damaged because you cannot repair them. 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. Bad defrost timer symptoms can include an overflowing drip pan, excessive frost on the coils, and/or irregular temperature readings in the fridge. A failed evaporator fan can also cause cooling problems because it wont circulate air through the freezer cabinet. Refrigerant flooding into the compressor. The most common reason for replacing the defrost. 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. It uses an adaptive defrost control board and there is no reset on the board. Frozen freezer drain Leonard M. 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. How to Tell Whether Your TXV is Bad. If your refrigerator is stuck in defrost mode and always seems to be defrosting, check the entire defrost system, especially the timer. 262K views 11 years ago This video provides step-by-step instructions for replacing the defrost timer on General Electric refrigerators. ANSWER Cory, To determine whether the defrost timer is faulty, you would want to see if the evaporator coils are impacted with ice. The defrost sensor has a fuse to back up the sensor in case the sensor fails. 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. Maytag Refrigerator Defrost. As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. Time involved (including defrosting drain line) was about two hours. To determine if the defrost timer is defective. The defrost timer motor runs and moves the control components in the device. Steps To Fix Bad Defrost Timer Symptoms 1. Troubleshooting the Defrost Timer in a Kenmore Elite. 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. Matt Akins is ACCAs Manager of HVACR Education. ANSWER Cory, To determine whether the defrost timer is faulty, you would want to see if the evaporator coils are impacted with ice. Most of the time, the defrost thermostat is found behind the back wall of the fridge on the evaporator. Be sure to disconnect power to the refrigerator before replacing this part. 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. 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. 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. 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. 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. Denver Broncos sign Illini OL Alex Palczewski as undrafted. 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. Your model doesnt use a defrost timer. Attempt to manually turn the motor shaft, it should turn freely with minimal resistance. 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. This should be easily managed. After 8 hours of runtime power is switched to. If the bimetal thermostat fails to function, the refrigerator or. Leave the other wires connected to the timer so theyre out of the way. com%2fdiy-tips%2frefrigerator-defrost-problems%2f/RK=2/RS=Z1_VtmIwBoDFQkfpC2B5j. It is possible the heat strips are undersized -- it is a new construction house. Troubleshooting Defrost Timers & Unit Coolers. One critical component of a heat pump system is the defrost control board. If the evaporator coils have a significant accumulation of ice on them, it is the first sign that the defrost heater is bad. When the cooling coils become cold enough, thermostat sends signal to defrost heater to turn on. Locate Defrost Timer And Shut Off the Power. If the loud refrigerator noise is coming from the inside of your appliance, the failing part is probably the evaporator fan, which circulates air through the freezer and fridge. A defrost bimetal thermostat is a common feature of refrigerators and freezers. How to test a refrigerator defrost timer. If the defrost sensor fails to shut off the defrost heater, the fuse will blow in order to shut off the defrost heater. If the heater fails to operate, frost will become ice leading to ventilation problems. Very easy repair on Frigidaire freezer. What kind of issue are you having that caused you to replace the relay/overload? OWNER RICKS. 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. Refrigerator or Freezer Thats Too Warm: Top 6 Reasons and. Refrigerator Defrost Problems. Refrigerator Making Clicking Noises? (Possible Causes & Fixes)>Refrigerator Making Clicking Noises? (Possible Causes & Fixes). The defrost control board has a pin selection for 30,60 and 90 minutes between defrost. If they are test the defrost thermostat and. Turn the freezer back on, and wait for 10 minutes. A partial TXV orifice freeze caused by too much moisture in the system. Take the new defrost heater and attach the wires to both ends of it. Heater-Defrost element, defrost thermostat, & timer, defrost. Three interval settings are available: 30 minutes, 60 minutes, and 90 minutes. Usually, when this part is bad, the refrigerator will be slightly warmer than the freezer. 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. If it was cooling before, it is now in defrost mode. Depending on how the pin is set, the defrost board will initiate a defrost every 30, 60, or 90 minutes IF the defrost thermostat is closed, meaning that the coil is below 30°F when that timer runs out. 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. Bad Defrost Timer Symptoms (Fixed). As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. 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. Depending on the model, the control may be a defrost timer or a defrost control board. 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. This blog article by ACCA’s Matt Akins will take you through the essential operation of a defrost control board and some basic troubleshooting. 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. It can normally be found on the evaporator tubing. The electronic control board monitors the thermistor and controls the refrigerator temperature based on thermistor signals. Compressor Is Malfunctioning GE Refrigerator Does Not Defrost – Solutions. It can be found behind the refrigerators lower kickplate, in the refrigerators control panel, or even behind the refrigerator on its back wall. 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. 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. Your model doesnt use a defrost timer. The defrost timer may need to be replaced if the fridge will not maintain its temperature or has frost buildup. If your refrigerator is stuck in defrost mode and always seems to be defrosting, check the entire defrost system, especially the timer. GE Refrigerator Does Not Defrost. Palczewski four times earned. Signs Of Heat Pump Defrost Control Issues, How To Prevent >Signs Of Heat Pump Defrost Control Issues, How To Prevent. Turn off your power, and then remove the wiring from the thermostat, and connect them to your defrost heater. A defrost bimetal thermostat is a common feature of refrigerators and freezers. Bad Defrost Timer on Refrigerator Part 1 of 2. Refrigerant flooding into the compressor. Here’s how to test your appliance’s defrost timer: Start by. Compressor Is Malfunctioning GE Refrigerator Does Not Defrost – Solutions. 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. 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. If there is no continuity on one of the parts then it is bad and would need replaced. If they are test the defrost thermostat and defrost heater for continuity. 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. Sometimes when it goes bad, the full evaporator will become encased in ice. 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. That model was manufactured by Amana and theyre known for bad compressors and restrictions. Remove all the screws you find and pull the timer carefully out of the refrigerator. Repair Time Estimate. Also, check the door gasket and replace it if worn. Here’s how to test your appliance’s defrost timer: Start by locating it. If the heater has come on you will either see it glowing red or you will hear the sound of water hitting a hot surface. The delta is often only a few degrees, but will increase briefly to 15+ degrees. eHdHA- referrerpolicy=origin target=_blank>See full list on ufixit. You should also inspect the fan and motor for any signs of wear or damage, removing any foreign objects in the area. 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.