I have Bosch Nexxt 500 Washer. It stops draining and flashes E04 error. Any idea what is causing it or how to troubleshoot and repair?

call Bosch 1800 944 2904

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E04 means that you are not draining quick enough, if you are using HE detergant then your drain line is probably clogged. There is a round access panel on the lower right corner of your washer. If you stick a small screwdriver through the tiny little hole on this panel and twist the panel off you will see the drain pump catch. You can twist this cap off by hand and remove all the debris inside. WATCH OUT a lot of water will be coming through.

This video will show you how to find the fault on a Washing Machine that Won't Drain or empty the water away on Bosch
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Timed out on drain cycle, basically you either have an outlet blockage or something is trapped in the pump, you can check the pump by opening the bottom right flap on the front panel,manually emptying the w/m and checking the pump filter for coins etc. Also, check the outlet isn't blocked.
Good Luck.

The 03 error code is the drain. Disconnect the drain hoses and check for blockages. If no blockage "time" the drain interval. If it's more than 6 minutes it's the pump. Also make sure you're using the correct type of soap so the ball check valve on the bottom of the outer drum isn't getting fouled with excessive suds. Also disconnect the drain hose from your house plumbing and let it free flow on it's own. This will tell you if the block is in your plumbing, and not in the machine. Assuming that your filter is clean.

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during a normal wash cycle the washer stopped and gave an e;4 error code

I did it! The trick was to push a small nail into the hole and push in on the filter door while rotating the door...all at the same time. The original problem was the water not draining and the washer displaying code E04. Just like a previous solution stated, there was one knee high sock in the drainage pipe.

In order to unlock the door on this machine you must first turn the cycle knob to a cycle that was different than the one you were on. The machine should then reset and the door should unlock.

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Wow - I can't believe it. I had the SAME problem and searched the internet. This was the first site I found and was initially discouraged since there was NO solution, but upon further searching, I found the answer. I'll post the site here http://applianceguru.com/forum2/14805.html and you can just hop on and find out the answer in a much more helpfully worded way than I could ever do it!
I found a girls bobby pin and a rubber band stopping my drain from functioning! I thought it would FOR SURE be legos, but those boys are off the hook!