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Samurai Appliance Repair Man's Blog



Schematic Diagrams, Timing Charts, and Open Neutrals

schematic, troubleshoot and 1 more...
Here's an excerpt of a 20-minute training video now available in the Fundamentals of Appliance Repair training course on how to use the schematic diagram and timing chart to troubleshoot a problem with a washer drain pump that would not operate. The drain pump itself was good and getting voltage. Turns out that the problem was an open neutral.



The full training video explains these important troubleshooting concepts in detail:
- how to break down a complicated schematic and read it to solve the problem you’re working on,
- using timing charts to interpret timer switches on schematics,
- technical explanation of open neutrals,
- test methods for identifying an open neutral,
- power and loads.

Samurai Tech Academy Fundamentals students will find the full-length video in the Troubleshooting module of the Fundamentals of Appliance Repair training course.

Fundamentals graduates can also log in and watch the video because all STA courses come with lifetime access.


Whirlpool Vertical Modular Washers VMW randomly going into Endless Test Cycle

Posted by Samurai Appliance Repair Man, in Washing Machine Repair 11 October 2014 · 805 views
whirlpool, washer, vmw, vm washer
Brother Bob brings us fresh pearls from Whirlpool Tech line on the latest strangeness going on with these Whirlpool VM washers:

Hi All,

Had an interesting call on a Vertical Modular Washer yesterday and I thought I should pass on the info that Tech Line gave me.

This was actually a Maytag M# MVWC425BW0. Purchased 12/28/13.

Compliant: Customer started a wash, left the house, came back home 5 hours later and washer was still running. Later that night she said that as they were watching tv the washer started up all by itself.

This washer was stuck in the "Endless Test Cycle". Tech Line said that this is used to test the washers before they leave the factory.

Tech Line said that if this was a new washer it would simply mean that someone at the factory forgot to take the control out of the Endless Test Cycle. However, he said that for the past year to year and a half they have been seeing these washers putting themselves into the Endless Test Cycle and the Engineers are stumped as to why this is happening.

To turn Endless Test Cycle On or Off:

Put the washer into Diagnostics, turn the dial to the LEFT (counter-clockwise) until the Wash- Rinse- Done lights are on. Push Start. If the washer powers Off you have just taken the washer OUT of Endless Test Cycle. If the washer starts to Fill you have just put the washer INTO Endless Test Cycle.

If the washer powers OFF, unplug for 5 seconds, plug back in and wait 10 seconds, if the washer does NOT start to Fill you have successfully taken the washer out of Endless Test Cycle.

He said that they have also been seeing replacement Control Boards leaving the factory that have not been taken out of Endless Test Cycle. He said that if you replace a Control on these washers to go in and check to make sure that Endless Test Cycle is indeed turned off.


Source: Whirlpool VMW Washers


Some Uncommon and Unexpected Symptoms of a Flakey Speed Control Board in Older Frigidaire Front Load Washers

Posted by Samurai Appliance Repair Man, in Washing Machine Repair 30 May 2014 · 980 views
washer, frigidaire and 1 more...
Brother Brnt dispenses some pearls of wisdom on this topic:

kenmore model 417..... made by frigidaire
you say you caught the machine filling and draining endlessly?

known frigidaire problem
you need a speed board, also called the motor control unit

and yup a bad speed board can do all sorts of flakey stuff
another symptom .... timer knob gets stuck at around the 5 o'clock position

another common problem i saw with these machines.... the tub can go out of balance bad enough to smash into the bottom of the timer.
Remove washer lid, closely examine the bottom of the timer and where that molex plug connects there, look to see if it looks squashed or out of place

but filling and running the drain pump forever is the speed board for sure
frigidaire blamed this on electrical interferance comming from other outside sources, they say they modified later boards to prevent this
this was like 10 years ago or so



Source: washer is going crazy Kenmore 417.40412700


Boot Camp Booty: Using the Schematic Diagram to Troubleshoot a Whirlpool Front-Load Washer that Won’t Run

Boot Camp, Whirlpool, washer
In this exciting episode, the Samurai shows you how to use the tech sheet schematic to troubleshoot a newer Whirlpool front load washer (one of the new Alpha2 platform washers) that acts like it wants to start but won’t. Watch with shock and awe as I ruthlessly hunt down the miscreant part and guide you through the troubleshooting process both on the machine itself and on the schematic diagram, demonstrating killa troubleshooting techniques that every tech should know. Come with me now on a journey of Total Appliance Enlightenment:

Using the Schematic Diagram to Troubleshoot a Whirlpool Front-Load Washer that Won’t Run


What causes SUDs and SD error codes in high-efficiency front-load and top-load washers?

Posted by Samurai Appliance Repair Man, in Washing Machine Repair 01 February 2014 · 990 views
HE, SUD, SD, error codes and 2 more...
Many important questions have plagued mankind since the dawn of time. Questions such as, "Why am I here?", "Who is God?", and, most importantly, "What causes SUDs and SD error codes in high-efficiency front-load and top-load washers?" Here now to guide us into the truth and understanding of this important epistemological question is Brother Delawaredrew:

Suds errors are often detergent related. It's not so much that the pump doesn't pump suds (although it doesn't) but that the pressure switch can't tell the difference between suds and liquid. So the computer doesn't see an empty tub.

An easy explanation of when computers generate a suds error is that the program has a set time allowed for the drain part of the cycle. For instance many whirlpool front loaders allow 4 minutes. After that time if the cpu has not seen a change in the pressure switch reading the SD or Suds or whatever error is displayed (this is why clogged or bad pumps show Suds) ... some machines will have some sort of suds killing routine that is initiated and some will just stop. If the CPU still doesn't see a change in water level after continued pumping you usually see a long drain code like LD or F01 or F21.

When I see repeat drain errors I first try to tell if it actually is draining at a good rate... if so I will check the pressure hose for clogs by first blowing into it at the switch end. If that is okay test the switch itself (if no fill errors are happening this is less likely) then the wiring. On models with integrated pressure sensors obviously you can skip testing the switch.

About the Cabrio/Bravos/Oasis models - lint, socks and other items sometimes gather at the sump cover and block the pump intake. Also coins and other items can damage the plastic impellors of the pump; decreasing pump rates yet still moving water.

I only get about 30 minutes per call so I have a pretty set method of diagnosis for problems to eliminate common issues. It works for me but we all think differently. In general I go for simplest solution first unless I know that a certain component is likely; like the analog pressure switches and F35 error.

Hope that helps.



Source: Suds error sd






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