Bosch Dishwasher Takes Forever to Complete a Cycle

by Samurai Appliance Repair Man on June 9, 2006

in Dishwasher Repair

I have actually been on a service call where the customer had hired another servicer to repair this problem. The other servicer, obviously merely a parts-changing monkey and not a real technician, simply slapped in a new heating element, didn’t bother to check his work, collected his money, and left. I asked the customer why she didn’t call him back to repair the problem for which she had hired him in the first place. She said he was too hard to reach, has left several messages with no return call, and she’s rightfully concluded that he is simply an incompetent cockroach and she wanted to try someone else.

Now, in the Bosch dishwasher, one indication that there’s a problem with the water heating circuit is if the dishwasher takes forever to complete a cycle. Note that “problem with the water heating circuit” does not equal “bad heating element.” While it’s true that the heating element is part of the water heating circuit, it is only one of several parts which can fail and kill power to the heating element. “How can we tell this?” you ask, incredulously. Well, Slick, a real technician uses a multimeter to make some simple electrical measurements so that he can determine, with absolute certainty, which part is bad. No guess work involved here. No replacing a part and hope you get lucky. Real technicians do something called “troubleshooting” in order to prove which part is defective.

So I pulled the wiring diagram for the dishwasher and measured the continuity of the heater and the heater’s thermal cutout fuse– both were good. Therefore, I knew that the problem had to be in the control board. So I opened the control panel, pulled the control board out and, walla!, found a burnt solder joint at the heater relay. How ’bout them apples?

Bosch Dishwasher Control Board with Burnt Heater Relay Solder Joint

So I got my solder gun from the van, soldered the connection, popped the board back in and ran the dishwasher. Within minutes, that heating element was drawing 11 amps, right on the design specification for that unit. Another successful Samurai repair.

If your control board is beyond repair or failed in another manner, you can buy a replacement control board here.

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