Learn how to troubleshoot using schematics like a real tech…

Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Podcast | Contact

Stay connected with us...

Samurai on Facebook - become a fan today! Sign up for our free newsletter and keep up with all things Appliantology. Subscribe to our YouTube channel for lots of appliance repair tips and help! Follow the Samurai on Twitter and get timely morsels of Appliantological Wisdom! Subscribe to our MST Radio podcast to learn secrets of the trade.
  • Announcements

    • Samurai Appliance Repair Man

      Webinar Recordings Index Page   11/07/2017

      On-demand appliance repair training videos for Professional Appliantologist members Over 30 hours (and growing!) of original, high quality appliance training webinars developed and given by yours truly are at your fingertips, on topics you won't find anywhere else. Fill in those knowledge gaps, strengthen those areas of uncertainty, and boost your skills. Watch on mobile or desktop at your convenience whenever, wherever.  Ultra Short Primer on Basic Electricity, Circuits, Ohm's Law, and Schematic Reading (Length: 1:04:48) Basic Refrigerator Troubleshooting (Length: 1:10:45) Schematic Reading Workshop, 10/2015 (Length 1:19:08) Troubleshooting Strategies for Computer-Controlled Appliances (Length: 48:34) Semiconductors and PN Junctions (Length: 1:04:37) Appliance Temperature Sensing Devices & Technology (Length: 1:27:33) Voltage Measurements, Meters, Ghost Voltages, and Triac-controlled Neutrals (Length: 1:29:32) Troubleshooting with Tech Sheets, Part 1, 4/2016 (Length: 1:09:26) Troubleshooting with Tech Sheets, Part 2, 4/2016 (Length: 1:21:11) Tech Sheet Review, 4/9/2016: Bosch Speed Cooker, Amana Refrigerator, GE Glass Cooktop Range (Length: 1:22:58) Pulse Width Modulated (PWM) Switches used in Samsung Switched Mode Power Supplies (SMPS) (Length: 27:07) PWM Computer Cooling Fan in a Whirlpool Refrigerator (Length: 14:53) Understanding AC Split-phase Household Power Supplies (Length: 52:41) Troubleshooting a Samsung Electric Dryer without Disassembly using Live Tests and the Schematic (Length: 22:47) Troubleshooting a Bosch Dishwasher No-Heat Problem using the Schematic and Live Tests (Length: 15:38) Linear Motors and Linear Compressors (Length: 55:54) Bi-directional PSC Drive Motor Systems in Whirlpool VM Washers (Length: 56:52) Appliance Service Call Structure and Troubleshooting Strategies (Length: 1:00:16) The Ten Step Troubleshooting Tango and Workshop Exercises (Length: 1:35:39) Troubleshooting Ten-Step Tango Advanced Workshop (Length: 1:32:06) Ten-Step Tango Troubleshooting Workshop: Refrigerators (Length: 1:35:57) Whirlpool Duet Washer Schematic Analysis & Whirlpool Dryer Moisture Sensor System (Length: 1:03:04) Neutral Vs. Ground, Inverter Microwave, Digital Communications, Loading Down in DC loads, and more! (Length: 1:14:45) Gas Oven Service Call After a Parts Changing Monkey (Length: 36:04) AFCI and GFCI Circuit Protection Technology (Length: 41:26) Troubleshooting Samsung Refrigerators and more (Length: 1:29:58) 3-way Valves and Dual Evaporator Refrigerators (Length: 1:15:45) Split-Phase Compressors and PTC Start Devices (Length: 1:11:57) Gas Dryer Ignition Systems (Length: 53:50) Refrigerator Sealed System Thermodynamics, Part 1 (Length: 43:07) Refrigerator Sealed System Thermodynamics, Part 2 (Length: 1:09:09) Refrigerator Sealed System Thermodynamics, Part 3 (Length: 1:11:56) Refrigerator Sealed System Thermodynamics, Part 4 (Length: 37:45) Refrigerator Sealed System Thermodynamics, Part 5 (Length: 16:35) To access these webinars and all the other info-goodies here at Appliantology, become a Professional Appliantologist today. If you need cost-effective, time-flexible, state-of-the-art appliance technical training, check out the Master Samurai Tech Academy.
    • Son of Samurai

      [Webinar] Appliantology Workshop   11/09/2017

      Information is the name of the game in the appliance repair trade today. Appliantology is a powerful information tool for the professional appliance repair technician. But just like with any of the more capable tools in your tool bag, many of the more powerful features are hidden from you unless you "read the manual." Ugh! Who wants to do that? Well, this is one time when you don't have to! In this webinar, Team Samurai will personally walk you through the site and show you many of the useful and powerful features that even long-time users probably never knew existed.   
  • entries
    4
  • comments
    22
  • views
    4,138

About this blog

Entries in this blog

micabay

GFCI and National Electric Code 2014

Just got done sitting through an 8 hour course on the NEC.  This course goes towards my continuing education hours needed to maintain my electrician certificate for appliance repair (07D Washington State Specialty Electrician).  Most of the class doesn't pertain to our trade, but I was able to pick up a few gems.  

The National Electric Code (NEC) is the code used by jurisdictions to determine if your electrical supply is up to code, which releases a new edition every 3 years.

Section 210.8 is where it talks about Ground Fault Circuit Interrupter (GFCI) requirements.  With the edition of NEC 2014, 210.8 (A) reads: All 125-volt, single-phase, 15- and 20-ampere receptacles installed in the locations specificed in 210.8(A)(1) through (10) shall have GFCI protection for personnel.

Newly added to the the NEC 2014: 208.10(A)(10) Laundry Areas.  That's right.  All laundry areas in new built or remodeled homes will include GFCI to all 120 volt receptacles.

Another new add on for the 2014 NEC:  210.8(D) Kitchen Dishwasher Branch Circuit.  GFCI protection shall be provided for outlets that supply dishwashers installed in dwelling unit locations.

One comment mentioned by the instructor at my class today.  "Every year that I teach the class, the NEC adds more locations that GFCIs are required."
 Which was followed by a comment from him.  The Code Panel is talking about adding GFCI to 240Volt outlets to the list of required circuit.  If this is so, the GFCI reset would  most likely be on the circuit breaker, because GFCI breakers are becoming more and more common.  

 

micabay

Unbonded 240 VAC or Why You Should Not Let Cousin Eddy Install Your Dryer.

Customer called: Hey, got a dryer that is not starting.
Set the appointment for the next day.  

The second thing I found: the dryer cord hooked up wrong: (actual photo of said dryer had to be staged as I forgot to snap a photo of the terminal block. All 3 of the following terminal block photos are wrong and can/will cause this situation.)

D9D77CCA-89EF-495E-9590-7363C3760D5E_zps

D623A15C-B686-4439-899A-89757FBF32AE_zps

B62B154A-30C5-49F5-956D-2C8049118A09_zps

Having the cabinet grounded is similar to wearing a seat belt in a car or a helmet riding a bike.  It is only needed when it hits the fan. On my call, the fan got intimate with matter of the fecal variety. 

Before finding the cord hooked up wrong: I found the heater to be grounded, which heated non-stop, blowing the thermal fuse.

Part# 279838 and 3392519.  

Last but not least, the actual dryer which inspired this post :

3DED777B-48AF-4408-A4CD-1457F8F62B03_zps

Its friend next door, the washer(Below):

252416FC-FBC3-4188-9DED-0B9DC2391CA0_zps

When the heater grounded out, the electricity had no ground path to follow.  It had to find a path, by arching to the washer cabinet, which was properly grounded.

 

Please, hire someone that knows what they are doing.  Or at least someone that knows how to follow the pretty little pictures:

12E2826D-D99F-4461-8766-A7E1166B6204_zps

Screen%20Shot%202016-05-05%20at%208.32.1

micabay

Dryer dry time and 240/120VAC

Today's customer was complaint: Dryer taking too long to dry.
blogentry-82846-0-91809500-1439502238_th
Here in the states, our homes are typically wired for 240/120VAC. Some are 208/120VAC systems but that is for another day/story.
The heater in this Samsung Dryer is 9.5 ohms.
Pictured above, the dryer was found hooked up incorrectly, with L1 and Neutral being hooked up backwards when the movers installed the new dryer cord. Which means the heater element was only getting 120 Volts rather than 240 Volts as it was designed.

 

What does this mean for our poor drying complain? The heater in this Samsung Dryer is 9.5 ohms. The heater was supplied with 120 VAC (incorrectly).
9.5 ohms @ 120VAC =1516 Watts.
Now if the dryer was hooked up correctly, blogentry-82846-0-04947400-1439502257_th the heater would be getting 240 VAC.
9.5 ohms @ 240VAC= 6063 Watts. Watts is power output or heat. 1516/6063=.25 or 25% of normal output wattage.....

 

Dryer taking too long to dry. Her quote when describing the problem: "I have to run the dryer about 4 times to get a fully dry load."

 

The best part about this story, the manufacture color codes the wires from the dryer to match the dryer cords. Just in case there is any confusion, they have also attached a pretty picture. blogentry-82846-0-38007600-1439502270_th

 

Bonus Question: What would have happen if you hooked up the cord incorrectly with L2 and N switched?
blogentry-82846-0-44893800-1439506026_th

micabay

Part deception

Recently, I needed to put two infinite burner switches in a Frigidaire slide in range. These switches were for the two large burners. Installed them, and did the simple but basic tests. Both burners now working, customer is happy, :blinky: , I'm happy. I collect my beer :pint1: money for the day and off to other adventures.

Customer calls back next day and not so happy. One burner doesn't get hot enough to hardly boil water. Okay I said, see you later today? Yes. Get out to location and here is what I discovered.... see the pictures below.

D4B4E41F-1481-4FA7-A3A1-DBCB54557D76_zpsncvapbc0.jpg

C530FE2E-E687-4733-AC88-B2D43FB339B1_zpsiuhpocxd.jpg

Did you see it? I almost didn't. Of course the story above is highly plausable but totally fake, because, I saw it before installation of said part. Moral is, always inspect your parts before installing them. One of the switches must have fallen off the assembly line and been packaged with the wrong part number... At the Factory!! Say it aint so, a manufacture making a part mistake?!!? :woot::woot: