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Appliance Repair Tech Tips

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Understanding Superheat and Subcooling with the P-H Diagram

If you read my previous post about sealed system basics, you know that understanding the thermodynamic states of refrigerants (saturated, subcooled, and superheated) is essential to sealed system troubleshooting. In that post, I explained these states in terms of a simple pressure-temperature table. While that keeps things simple, it doesn't really give you a strong visual and mental model for how the refrigeration cycle works thermodynamically. That's why we're going to spend this whole po

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How Do the High-Voltage Circuit and Magnetron in a Microwave Work?

We're going to take a dive into what exactly is going on electrically with the high-voltage circuit in a microwave. We'll use this specific schematic as an example, but these principles apply generally. Don't worry about most of the schematic. All that matters to us right now is the high-voltage section -- the transformer on the right side of the schematic and everything to its right. If you're not familiar with how magnetrons work (or even what they are), then this circuit

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When Ohm's Law Doesn't Apply...

Ohm's law, meaning the set of simple equations that define the relationship between voltage, current, resistance, and power, is an essential tool for appliance techs. Not only is it the cornerstone of understanding electricity, but it's also an invaluable troubleshooting tool. This said, there are some loads to which the simple form of Ohm's law doesn't apply. The simple form of Ohm's Law only takes into account real resistance (ohms) but does not consider other ways that electron movement can b

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The Problem Statement: Don't Troubleshoot Without One!

The very first step in troubleshooting a broken appliance happens long before the tech sets foot in the customer's home. In fact, it can happen even before the tech knows about the service call. We're talking about formulating a problem statement. What I mean by a problem statement is very specific. A valid problem statement answers these two questions: "What is the appliance not doing that it should be doing?" and/or "What is the appliance doing that it shouldn't be doing?" It doesn't go b

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The Appliantology Referral Program

Appliantology has always been a community built by techs, for techs, and one of the biggest ways the community grows is by simple word of mouth: techs telling other techs about all the awesome learning, discussions, and tomfoolery that goes on here. To that end, we've got a great opportunity to show our appreciation and give a perk to techs who spread the good word of Appliantology. All site members, including Grasshoppers, can become Appliantology apostles. "Apostle" means "one sent out" u

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How Many Speeds Does This Fan Motor Have?

Let's look at a seemingly simple load that has more going on than you would think: a multi-speed hood fan in a microwave. The questions we want to answer are: how many speeds does this fan have and how does it achieve those speeds? If you look at the spec block for the motor, the answer to the first question seems easy -- looks like it's a simple two-speed motor. But when you look elsewhere in the tech sheet, you find this voltage table that seems to state you have four speeds. (

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An Introduction to R600a and Lokring

We’ve all been hearing about R600a refrigerant for years now, and the reality is that it’s no longer an innovation in the area of household refrigeration; it’s the new standard. With the majority of new refrigerators now being R600a models, repair companies need to be ready to perform sealed system repairs on them. This raises a few questions for these companies: how is R600a different from R134a, and what do I need to service R600a refrigerators? R600a (let's just call it R600 from he

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Sealed System Basics: Saturation, Subcooling, and Superheat

Sealed system thermodynamics is a deep well, but fortunately, you only need to skim the surface to gain a functional understanding. And as techs, it's this functional understanding that we need to acquire in order to effectively troubleshoot. To do that, we're going to cover the three central concepts to understanding a sealed system: saturation, subcooling, and superheat. Let's start with the one upon which the other two hinge: saturation. In order to talk about what saturation is, we

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Happy Thanksgiving from Team Samurai!

Happy Thanksgiving from all of us on Team Samurai! I'm thankful for a year of Appliantology members keeping each other sharp and preventing us all from devolving into turkey techs. It's due to this fine community that we're not the ones in the oven.. this time.  Here's to another great year!

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Troubleshooting Gas Range Burner Spark Ignition Problems

Gas burners are a whole little microcosm within appliances with some interesting technology that we don't see much elsewhere. In this webinar recording, we cover how to troubleshoot various cooktop ignition systems, covering topics such as: DSI systems Single-point ignition Reignition systems Continual sparking after a flame is established Applying the Ten-Step Tango to real-world problems ...and more! Click below to check out this webinar record

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A Practical Rundown of Sealed System Diagnostics

In this two-part Master Samurai Tech webinar series, we explore the nuances of sealed system diagnostics. Specifically, we're covering the nitty-gritty of applying our understanding of sealed system thermodynamics to real-world sealed system failures, such as refrigerant leaks, overcharges, and inefficient compressors. Sealed System Diagnostics, Part 1 Sealed System Diagnostics, Part 2 Topics covered in the first part include: Sealed system temperatures and pressure

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An Odyssey Through Conflicting Information in a Samsung Washer Fast Track

Come on a journey with me as we explore just how tangled your circuit analyses can get when you're confronted with conflicting information in a tech sheet. Here's the Samsung washer schematic we're working with: Nothing crazy here -- this is pretty standard stuff to see on a Samsung schematic. But when it gets weird is when you try to trace out the power supplies of various loads and board on the schematic with the help of the pinouts elsewhere in the same tech sheet. Here's

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Diagnostic Modes: What They Can Do and How to Use Them

Some techs long for the "good old days" of mechanical controls, when troubleshooting appliances was supposedly simpler. But the universal use of electronic controls nowadays actually provides many troubleshooting benefits -- in particular in the form of error codes and diagnostic modes. The purpose of error codes is for the control to tell you its best guess of what's wrong, based on the algorithms programmed into it by the engineers. Note that the engineers' best guess is sometimes a very

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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? This is certainly possible to do, and it can be a useful measurement, especially in hairier inverter troubleshooting scenarios. But before we get into that, let's

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Dealing with Bad Heater Specs on an LG Dryer

Imagine you're in this situation: you're trying to do some ohms testing on the heater of an LG electric dryer. You're reading 21 ohms across a single coil, and 42 ohms through both coils. But when you look at the spec on the schematic, you're seeing almost exactly half that: Weird. Maybe the heater is out of spec, but that's a weird discrepancy. And it's bizarre that we're reading double the specs given. Can we get a second opinion? You look elsewhere in the manual, and you find

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Why Forums are Better than Facebook

Unlike when we first started Appliantology, the Internet is now full of appliance repair support resources. From Facebook groups to subreddits to Voxer and Telegram groups, you've got your pick of the litter when it comes to what flavor you'd like. Are there advantages to using a private forum-based site like Appliantology over the social media plantations? You betcha: Privacy and Functionality Feeding Big Brother All the Big Tech social media sites have one thing in common: they

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Professional Appliantologist Membership Application

FOR PROFESSIONAL APPLIANCE TECHS ONLY! Appliantology is the premiere appliance tech support site on the web. This annual membership unlocks the total and awesome power of Appliantology, turning it into a fearsome weapon of mass instruction and appliance information tool for the professional appliance tech who needs bleeding edge technical info. If you are a member of Nationwide, click here to apply for your Appliantology membership. You'll get all of these perks and benefits: A

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Take a Deep Dive into Understanding Household AC Power Supplies...

All appliance repair techs should understand the AC split-phase household electrical power supply that they deal with on a daily basis. But the fact is that most do not, and there's a lot of disinformation and "tech myths" out there about these power supplies. But they re easy to understand once you grasp a few fundamental concepts about electricity and split-phase voltage. And that's exactly what we cover in this webinar recording! Topics covered include: How sine waves are us

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Think You'd Never Be Stumped By a Dryer? Think Again...

We're taking a step back from our fancy electronics to the good ol' days of simple AC circuits. Well, I say "simple", and that is true -- but engineers back then had to pull out all the stops and do some pretty cool tricks to get the functionality they wanted. This means that, to really understand what's going on in these older circuits, you need to have a firm grasp of both AC circuits and the technology used. In this webinar, we: Work through 4 real-world dryer case studies that h

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Can You Handle These Tricky Circuit Puzzles?

Want to really put your technical know-how to the test? Well, have we got the webinar for you! This one covers a whole potpourri of circuit puzzles and troubleshooting scenarios, including: Some pop quizzes about series and parallel circuits Diodes, how they work, and the surprisingly tricky situations that can arise because of them Loads in series, how they work, and what they look like in a real refrigerator schematic A real world troubleshooting scenario invo

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Diagnosing Temperature Problems in Computer-Controlled Refrigerators -- Including Samsung!

Special guest presenter Mark Williams will show you how easy it is to diagnose temperature problems in the newer electronically-controlled refrigerators and how to do it right the first time.  We'll show you examples from Samsung, LG, GE, Whirlpool, and Electrolux. You'll see that they all work the same way.  You'll also see how to accurately test thermistors from the computer control board and you’ll learn the difference between resistance and voltage drop when it comes to testing the

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How is this Miswired Dryer Still Able to Run?

In this short, easily-digestible technical workshop, we dive into some of the wacky things that can happen when a sloppy tech miswires a dryer terminal block. In fact, this dryer looks like it shouldn't be able to run -- the neutral wire isn't even connected! And yet it does run. How, you ask? That's exactly what you'll need to watch and find out. This and our dozens of other technical training webinar recordings are only viewable by premium tech members at Appliantology. Topics covere

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Avoid These PCM Control Board Troubleshooting Mistakes by Using the Ten-Step Tango

A lot of techs lose their heads when it comes to control boards. This leads to the classic PCM behavior of "throw a part at it and hope it works." But isn't there a better way of troubleshooting computer-controlled appliances? Of course there is. With a concrete and logical troubleshooting plan like the Ten-Step Tango, you can troubleshoot any appliance with a control board with confidence. In fact, in many ways, a control board being present makes it easier to do your troubleshooting.

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Learn How to Troubleshoot an LG Gas Dryer Like a Real Tech

In this interactive webinar workshop, we explored an LG gas dryer issue that had stumped an Appliantology tech. We performed a forensic analysis on the troubleshoot to figure out how it could have been improved, and then we moved on to thoroughly examine the circuits and understand how they work.  This and our dozens of other technical training webinar recordings are only viewable by premium tech members at Appliantology. Topics covered include... DC and AC loads Compute

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