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

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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Download Service Manuals and Tech Sheets at Appliantology.org
Download Service Manuals and Tech Sheets at Appliantology.org
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What is LG's FlowSense and How Does It Work in Gas Dryers?
Take a look at this LG gas dryer schematic, paying special attention to the circuit with the flame detector.
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Learn How to Identify the Three Kinds of Dryer Thermal Controls
Here's everything you need to know about thermal controls in dryers and the underlying technologies behind them.
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Can you Measure the Output of an Inverter?
When it comes to troubleshooting BLDC motors and inverters, there's usually a standard strategy. You check the input to the inverter (a good 120 VAC power supply and a PWM signal from the main control) and you make sure the motor windings are in spec and all the same resistance. But what about measuring the output of the inverter?
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A Short, Practical Guide to Circuits and AC Power
Electricity and circuits are at the core of what we do as techs. You've got to have a solid understanding of these in order to do any meaningful troubleshooting. So that's exactly what we cover in this excerpt from one of our many technical training webinar recordings. Give it a watch and build yourself a solid foundation!
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Troubleshooting a Bosch Dishwasher No Heat Problem Using the Schematic and Live Tests
In this excerpt from a longer webinar, the Samurai walks through a Bosch dishwasher no heat problem that he encountered, working through his thought process and schematic analysis step by step. Watch it and learn a thing or two!
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Are Thermistors Interchangeable?
Thermistors are everywhere in appliances these days, and they're a relatively common-fail item, so wouldn't it be nice to stock a supply of them in your service vehicle to be used on any occasion?
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A Real World Example to Help You Understand Shunts and Loads in Series
Some circuits have a bit more going on than they seem at first glance, and this Whirlpool washer has one such circuit. Watch the excerpt below to learn how to unravel this tangled mess of lines and apply it to your troubleshooting.
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Identifying and Understanding Transistor Switches on Schematics
There are a lot of funky things going on on this Electrolux dishwasher schematic -- including normal-looking switches that are labelled "transistor switches". What does this label mean, exactly, and how does it affect our troubleshooting? That's what the Samurai breaks down in this short clip from a longer technical webinar recording.
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Using Frequency Measurements as a Troubleshooting Tool
Here's our scenario: you're working on a Samsung WA50K8600AW washer that won't advance in the cycle. Error codes and test modes aren't telling you anything useful, and the control doesn't even seem to be trying to advance the cycle. You've checked the air tube connected to the pressure sensor, too, and everything is clear there.

What can you do here? Do you just call it a bad board and move on?

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Can you Check a BLDC Fan Motor with Ohms?
Let's say you're on a call for a Whirlpool GI6FARXXY07 refrigerator. You notice that the evaporator fan isn't running, even when the unit isn't in defrost. "Simple enough," you think, and you disconnect the fan harness and check its resistance.

Wow -- 500 K-ohms! No way that's in spec. Gotta be a bad fan motor, right?

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Troubleshooting a Samsung Dryer: Won't Start but Always Runs
You're troubleshooting a Samsung dryer that won't start-- the control panel will let you select a cycle, but it won't actually run if you press the start button. But the real head-scratcher is that, despite not being able to start a cycle, the machine always runs when the door is closed.
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A Real-World Example of How to Troubleshoot Multi-Board Configurations
In our latest workshop webinar, we cultivated the much-desired skill of troubleshooting appliances with multiple control boards. Watch and learn!
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Unravel the Mystery of this Simmer Switch Circuit...
Take a look at the circuit for this electric cooktop element. Notice anything odd about it? Looks pretty straightforward, right? Well, it certainly is straightforward when the simmer switch isn't closed. Here's what the circuit looks like when it's not running on simmer...
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Troubleshooting a Whirlpool Dishwasher with a Cheater Cord
Here's the situation: our tech has a Whirlpool dishwasher that does everything normally, except the wash motor simply won't run. Board or motor? Here's how to use your cheater cord to directly test the motor.
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How Refrigerator Water Systems Work
There's a very common configuration of valves that are used in refrigerators with ice makers and dispensers -- so common that every tech should be very familiar with how it works and what terms are used to refer to it. You can't troubleshoot what you don't understand!
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Pop Quiz: What's Wrong with this Range Wiring?
You open up the terminal block on a Bosch range, and you see this. What's wrong with this picture? (Hint: those of you who have watched this webinar recording should know what's up).
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Identifying Power Supplies on a Samsung Control Board
See if you can identify two things on this Samsung dishwasher schematic:

1. Where does the control board receive line and neutral?

2. Where doe the sub-control boards get their DC power supply?
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Can You Solve this Schematic Symbol Mystery?
Here's something for you sharp Appliantology techs to puzzle over: what in the world is the circled symbol on this schematic?
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How Does this Dryer Run in a Seemingly Impossible Configuration?
As the picture says, the dryer runs like this. And even weirder, when you correct the wiring, it stops running. What one test could you do that would prove your hypothesis about this faulty circuit?
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One Powerful Measurement Could Have Saved This Tech Hours of Troubleshooting...
Here's the situation: the tech is working on a dryer that keeps blowing its thermal fuse. The tech has already replaced the fuse once, and it's now blown again. What could be causing this, and what's the best way to tell?
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