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Member Since 29 Apr 2009
Offline Last Active May 04 2015 05:46 PM

Posts I've Made

In Topic: KSSC48QVS00 will not start, display panel not working

06 June 2013 - 11:46 AM

Little late in noticing this, but also check this thread: http://appliantology...-thru-a-cowvac/

In Topic: KSSC36QTS02 KitchenAide SXS Control Does Not Come On

06 June 2013 - 11:44 AM

Also, you might check this thread:



In Topic: Whirlpool Oven Dim Display and Wire Nuts

17 May 2013 - 06:05 PM

We have rebuilt a lot of Thermadors ... they have quite a few different controllers ... but we should be able to help you out.

In Topic: KSS Builtin Kitchenaid Fridge Control Dropping faster than flies thru a CowVac

15 February 2013 - 02:38 PM

Also, we see a high percentage of this board fail for the shorted evaporator fan motor problem - the fan definitely takes the board out with it.




In Topic: Relay for Bosch SHX46A02UC/46

28 November 2011 - 08:01 PM

Good comments. While we replace a LOT of relays, I've found that the blown open solder joint is usually not accompanied by a bad relay. That surprised me at first ... but it makes sense. We often see this problem when the relay contacts are still showing really low resistance (like 8 milli-ohms!). If you do the math, say for a 10 Amp heater, the heat dissipated in the (normal) contact resistance doesn't create a very significant increase in the heat at the soldered pin. Only a few degrees. If the contact resistance goes up by 10X it still doesn't come close to melting the solder at the pin (but there is a heat rise that speeds up the failure mechanism).

I think the cause of this problem is usually a combination of the design of the circuit board pad, the diameter of the hole vs the relay pin, and the parameters set during wave soldering the board at the factory. Sometimes the result is that the cross-sectional area of the solder bridging the gap is not enough to sustain 10 Amps for the lifetime of the machine. I've sawed open relays that came off boards with this problem to inspect the contacts and they usually look good visually, sometimes new looking. Even though the resistance measured out good I wanted to see if they showed visual signs of failing. And usually ... not.

If in doubt, swap out the relay of course. But for a quick fix, your chances are good if you can fix the solder joint. As mentioned above you need a cleaned up surface for sure. The end result needs to be a nice shiny looking solder joint.

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