A properly functioning thermal fuse should produce a reading of 0. I am having trouble figuring out, how to test the Magnetron and the Transformer. ... Download Manuals for KitchenAid KEMC378KWH04 27" Built-in Electric Double Oven Thermal Convection Lower Microwave Convection ... How to Replace Thermal Fuse. There might also be issues with the Thermoprotector, Thermal fuse, or High Voltage Transformer that can lead to this type of problem. Were you able to determine the problem part? Most microwaves have a main control board that serves as the ‘brain’ of the appliance. I put in another 20amp fuse and did 30sec and the fuse blew in about 3 seconds. If you open door during cook cycle it blows microwave fuse. Found bad monitor switch and replaced along with internal 20a fuse. ... A defective relay can result in a variety of symptoms: * A relay with its contacts welded (stuck) closed would result in the oven coming on as soon as the door is closed or the power being stuck on high no matter what the touchpad setting. For this reason, everything else may appear in working order but the microwave will not begin heating. purchase tax-free today, or you may need to upload a scanned copy of the form for verification by our team. The one switch is like a deadmans switch. To access the door switch, you will have to dismantle the cabinet but only after unplugging the appliance. If you need further help with your GE microwave..... feel free to start a new thread and link to this one. To test the switch for continuity, set your multimeter to Rx1, depress the actuator button and touch the terminals with the probes. First of all, you need to disconnect the home appliance from the electric power supply. When the thermal cut-outs fail, your microwave won’t turn on as a safety precaution to keep it from getting too hot. When I found the bad monitor switch I also tested the continuity of the two other door switches and they showed continuity. I was looking for the service manual. Copyright © 1999-2021, Eldis Group Partnership. With the fuse removed from the appliance, set your multimeter to the Rx1 setting, and touch the probes to the terminals to test for continuity. Symptoms: No heat, loud hum when entering cook cycle, possible blown HV fuse (but will not likely blow the main fuse). Looking for any signs of wear, discoloration, damage, or cracking, visually inspect the door latch assembly. We can offer you custom troubleshooting help if you search with your model number. The capacitor had no continuity beeps and the Ohms were .9, which match the rating. The thermal fuse is sometimes known as the thermal cutoff. The vent fan thermostat was dead as well as the fuse. The sequence that the switches operate in is critical. Take a photo of your product’s model number plate and upload it to find parts fast! The PartSelect logo is a Registered Trademark of Atlantic Laundry Centres, Ltd. It protects the microwave from overheating. I just put everything back and a new fuse and it's working. All rights reserved. 09-Microwave Door Parts, ... Common symptoms and solutions. The thermal cut-outs, also known as thermal fuses, help keep the oven from overheating. To check a ceramic fuse, use an ohmmeter or continuity tester. You don’t want to finish a microwave cycle only to discover your … Questions of a Do It Yourself nature should be Let's begin adding your tax exemption certificate(s) to your PartSelect account. The door switch, also known as an interlock switch, signals other microwave components to begin powering when the door is closed, and to stop when the door opens. Be sure to transfer any add-on parts, such as an air duct or thermal fuse or cutouts; Ensure that the wire mesh RF gasket is intact and in place; Examine the rim of the opening where the magnetron dome is to be inserted into the waveguide. Check the cooling fan motor by measuring the resistance between its terminals. It contains the wiring diagrams and schematic for the unit. In ovens equipped with fuses that monitor the high voltage system, such as some commercial Sharp models and most commercial and domestic Amana models, the high voltage fuse would probably blow. All information is provided "AS IS." View our Privacy Policy here. With Avalara CertCapture, you can add your tax exemption certificates to your PartSelect account to purchase tax-free! The newer models of microwaves and other appliances tend to use the resettable thermal fuses. The cooling fan might have died or lost its effectiveness. Designed to prevent the microwave from overheating, the fuse – or in some ovens, the thermoprotector – can sometimes blow, preventing the oven from running. If your switch does not have continuity between the terminals, you will need a. Unplug your microwave before starting this test. #7: Bad Control Board. It might require a basic adjustment. When the thermal cut-outs fail, your microwave won’t turn on as a safety precaution to keep it from getting too hot. Lift them away from the microwave, and set them aside. I was trying to find a service manual but haven't located one. If the oven gets too hot, some electric models might blow a thermal fuse. to this site, and use it for non-commercial use subject to our terms of use. I have all those. You should receive a reading of 0, indicating that there is continuity. If your microwave oven blows a fuse, there are a couple possible causes. A faulty door switch which is also often called as an interlock switch is the part which signals the other parts to turn on when the door gets closed and to stop when it is opened. Verification is completed within 3 business days. If this switch closes before the other switches turn the microwave off.... you will blow a fuse. Usually ships within 6 to 10 days. I looked around and found this part, seems to be a common issue. How to test a microwave thermal fuse with a multimeter: Your microwave may not start because of an issue with the door latch assembly. The new thermal fuse will probably come with lugs attached. The ceramic fuse will be found near the power cord. This is a twenty amp 250-volt fuse, and is used to power your microwave. suggestions. The Microwave Runs Briefly and then Stops . I have tested the capacitor, magnetron, transformer, fuses, door switches and I still cant figure out why is the fuse blowing up. Just as most homes are equipped with fuses or circuit breakers, microwave ovens also have fuses that short out or blow in the event of an overload. Thermal fuses can be non-resettable and resettable which is also called thermal cutoff switch or thermostat. ge-microwave-blowing-internal-fuse-when-door-opened-during-cook-cycle. If the motor is good then most likely the magnetron itself is bad. If you find any issues while inspecting it, you will need a. Failures in the microwave generator can cause various symptoms including: * No heat but otherwise normal operations. You can't reset a thermal fuse so you'll have to replace the fuse if it trips. See details over at the other post (. I replaced both. How to test a microwave door switch with a multimeter: If your microwave won’t start and the display is blank and unresponsive, the issue may be with the ceramic fuse. It may be a glass fuse with a filament, or a ceramic fuse. I tested all 3 of the door switches for continuity. Remove the microwave’s cabinet, locate the fuse, and remove it in order to test it for continuity. Make sure that the home appliance has no supply of electricity before you start testing the thermal fuse. If your test produces a different reading, you will need a. There are many reasons your microwave won’t turn on, one of which might be a faulty door switch. All rights reserved. I have a whirlpool microwave and I keep replacing the lower door switches like e... Hi All. Loose or bad Thermal Fuse! I did the the continuity test wrong on the Magnetron and Tranformer. Replaced the fuse and the microwave works good as new. In most cases, this problem is caused by a defective door switch that fails intermittently. So no continuity on Magnetron and Transformer. If you see an error, try reloading the page. How to Verify the Thermal Fuse Is Burned out on a Dryer. Can anyone tell me what test and what reading I should get. If I wait for it to stop or if I press stop or cancel before I open the door, it doesn't blow. This thermostat is actually thermal fuse. The second microwave is plugged in, the vent fan starts. SOLVED**Microwave stopped working. Was always able to open door during cook cycle and never blew fuses before. I'm not well versed in electronics. I'm having the exact same issues. This part protects other microwave components from power fluctuations, and causes a complete loss of power when it fails, meaning your microwave won’t work. All were fine. I get confused reading about switches that are considered never open or closed or however its said. Most door latch assemblies are made of plastic hooks that stick out of the door and engage the door switch when the door is closed, signaling the rest of the controls to power the microwave. problems contact webmaster@doityourself.com. Troubleshooting Luxaire furnace - heat not working.