Bosch Wahing Machine 300 NEXXT Series

Possible that the drain pump is running due to a small leak is present at the base of the machine, providing this has a metal cover on it ,it gets water in here which activates afloat switch switching on the pump hence draining the machine to avoid possible flooding, if the pump does not appear to be running then the drain hose is too low resulting in syphon effect,in which case raise it...Good luck

This video will show you how to clean the pump and how to find the fault on a washing machine that won't drain or empty the water away on Bosch, Neff or Siemens. Please remember to subscribe to our YouTube channel for all appliance tutorials
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turn off the power to the unit for 45 min, that resets it

Possible this could be jammed lock and is advisable to check the lock settings.
Please check this link for tips.:
Door lock

your drain hose cloged clean out drain hose restart it then see what happens.

This video will show you how to change a door seal on this Bosch Nexxt 300 Series front loader washing machine
we have all bosch repairs in our channel
You can get seals on eBay

bosch nexxt 300 series washing machine This video will show you how to change the pump washing machine
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Check to make sure its drained okay a this can be at fault///Could be blockage at the filter

Put the washer on cold and run "TWO" cycles. There is too much soap or fabric softner.

There is a recall on the control board of many of these models, butyour problem is likely not related. It sounds like a plugged drain system or a possible bad drain pump. That's why you are hearing the pump running constantly. I have written a guide to help. It is here. Thanks!