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Top content from across the community, hand-picked by us.

Do Ohms Lie?
"Ohms lie." It's become a popular phrase in the tech community, but what does it actually mean? Should you never do an ohms measurement? Are they completely worthless? Or is this phrase just another example of tech mythology?
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One Simple Trick to Reading LG and Samsung Schematics
Both of the big Korean manufacturers -- LG and Samsung -- have a little trick that they like to use in their schematics. While I think they do it to keep the lines from becoming too much of a tangled mess, it can sometimes be a bit unclear for the uninitiated. Here's an example of an LG refrigerator schematic:
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Troubleshooting an Electric Dryer with No Heat and 120 Volts Present on Both Sides of the Element
Here's a scenario taken right from the trials and tribulations of an Appliantology tech: you're troubleshooting a no heat complaint on a GE electric dryer. You start your troubleshooting with the heating circuit, and your findings are puzzling: there are 120 volts on either side of the heater with respect to neutral, but when you do a voltage reading across the heater, you get some weird amount like 80 volts. What gives?
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Hall Sensors: How Do They Work?
Whether you were aware of them or not, Hall effect sensors are everywhere. Any time you see a motor on an appliance with any kind of RPM feedback or speed signal, there's a Hall sensor on that motor. As with any ubiquitous appliance technology, it's important for us techs to know how they work. A deeper understanding of the technology means a deeper understanding of how to troubleshoot it.
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How Refrigerant Absorbs Heat Without Getting Hotter
Refrigeration can seem a bit like magic -- how does a little bit of refrigerant being pushed around in some metal tubes somehow chill a freezer down to 0 degrees F? Well, it's not magic -- it's just physics.
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Voltage Dividers and how Control Boards Read Thermistor Input
We're all familiar with how thermistors work: their resistance varies with temperature, which in turn varies the voltage drop across them. The control board then reads that voltage drop and determines the sensed temperature based on that. But how?
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240 VAC Split-Phase Power Supplies Visualized and Explained
Ever wondered how L1 and L2 in a 240 VAC circuit have a voltage difference of 240 VAC? Or what people mean when they say that L1 and L2 are 180 degrees out of phase? And what exactly do we mean when we say "voltage difference" anyway?
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“What about hands-on training?”
We get asked this frequently by people who are new to the trade and considering enrolling in the online appliance repair training at the Master Samurai Tech Academy.
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How does this Dishwasher Motor with Triacs and Three Windings Work?
Take a look at this motor circuit: Three different windings? Triacs in the circuit? A "sense resistor"? What's going on here?
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How Magnetic Fields in a Split-Phase Motor Work
Ever wanted an in-depth explanation of how a split-phase motor gets going from a dead stop? Sure, most of us have a passing knowledge of what's going on. But do you really know what's happening on the electromagnetic level? What is this special "split-phase", anyway, and how do we quantify the way the magnetic fields interact?
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Pop Quiz: What's Wrong with this Freezer?
You're investigating a refrigerator that's not cooling properly, and you see the following bits of evidence:
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Implicit and Explicit Specs in Troubleshooting
Specs are essential for troubleshooting. After all, to test a hypothesis, you need to make electrical tests, and to make electrical tests, you need to know what your expected readings are. However, manufacturers don't always give you everything written out. What do you do if you need to make an amp measurement, but the manufacturer only gives you watts? That's exactly the question we're going to answer in this excerpt from one of our many in-depth technical webinar recordings.
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Testing for the Most Common Problem with Jazz Boards Using a Single Measurement
Jazz boards are a classic common-fail item in Whirlpool refrigerators, so important to know the right way to go about troubleshooting them. The good news is that they operate on the same principles that all control boards do, so if you know your basic electricity and troubleshooting principles, making big money off of these is a snap.
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What is the Purpose of this "Signal Transformer"?
Say you're working on the cooktop of a Frigidaire gas range, and after chasing some wires, you find that this component is in the circuit, right after the power comes in from the outlet, that label calls a "signal transformer", but what is the point of this device, exactly?
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The Schematic or the Written Directions -- Which Should You Trust?
We techs rely on accurate technical documentation to do our jobs. You can't make a troubleshooting plan or make meaningful electrical measurements without a good schematic. But what do you do when your technical info contradicts itself?
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[Video] Control Board Troubleshooting 101: Inputs, Outputs, Pinouts, and DC Signals
We've got dozens of hours of webinar recordings here at Appliantology covering all kinds of appliance repair troubleshooting strategies and technologies, ranging from the very advanced to the fundamental. This short excerpt from one of our many recordings covers the basic, but crucial concepts you must understand to troubleshoot an appliance with a control board -- even on seemingly "weird" brands like Samsung.
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The Simple Secret Behind this Maytag Dryer Timer that Won't Advance
We've got a toughie for you to figure out today. The tech in this scenario has been out on this dryer multiple times now, and the problem just won't go away. The heating element keeps going open, and the timer motor keeps stalling and not completing cycles. He's verified a good 240 VAC power supply to the timer and replaced both parts multiple times, but the problem keeps recurring every few months. What gives?
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Testing for a Failed Timer with EEPs and Convenient Voltage Tests
Our scenario today is a dryer that heats intermittently. Blitzing through the Ten-Step Tango, we select the heating element as our LOI.

But how do we test the heater's power supply? Do we have to start tearing things apart to do our tests?
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Disentangling Confusing Schematics and Customer Reports Explained in Less than 9 Minutes...
In this excerpt from one of the many technical training webinar recordings available to our members, we cover two tricky areas that have tripped up many a tech: deciphering an unclear schematic, and decoding a convoluted customer problem description. Both of these are essential skills for any tech, since if you mess up either of these steps, the entire rest of your troubleshooting will be thrown out of whack.
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How Does this 120 VDC Ice Auger Motor Work?
We've got an interesting one for you today: the ice dispenser auger motor in this fridge. There are a couple interesting things to figure out about it. First, what's the deal with its power supply? If you look at the label on the motor, you'll notice that it says 120 VDC.
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Electric Dryer Only Runs on Heat Cycles -- Solved with Schematic-Fu!
We've got a tricky one for you today: a Frigidaire-built Kenmore electric dryer that only runs on heat cycles. If you set it to a timed or auto dry, it runs just fine. But set it to air fluff, and you get nada -- no motor rotation, no nothin'. Sounds like a bad timer, right? That was our first thought, too. But like any good tech should, we covered all of our bases before jumping to conclusions, and what we found was much more interesting...
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How does the Monitor Switch in a Microwave Work?
What exactly is this the function of a monitor switch in a microwave oven and how does it work in the circuit?
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[Full Webinar Recording] Learn How to Build a Tech From Scratch
What do you do when you need to grow your team of appliance techs in order to meet the demand for service calls, but you can't find any job candidates with experience?
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How Do Diodes Work and How Do They Affect Circuits?
We encounter diodes in a variety of situations, such as in certain refrigerator water valve configurations. If you want to be able to properly troubleshoot these setups, you need to understand the underlying technology of diodes. How doe they affect the circuit around them? And how do you test them?
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Bypassing the Auto Temp Control on a Whirlpool Washer
How can you bypass the flakey and troublesome auto temp control in Whirlpool washers?
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