September 24, 2015 
Hi Paul, I have a Bosch WAS28440AU/27. It seems as though it has a faulty drain pump. I have checked the hoses and the filter plug, yet the machine keeps coming up with E.18 error. Could this be the pump? Thanks in advance.
Jay
Paul answers
Bosch WAS28440AU/27 washing machine Spare Parts
Hi Jay!
In fact E18 error code on a Bosch washing machine indicates a draining time out. This could happen for a couple of reasons:
1) blockage inside the filter
2) blockage inside the draining hose
3) problem with the pump
You need to :
- Check drain pump filter
- Check drain pump for blockage or restriction
- Check outlet hose for blockage or obstruction
- Check drain pump operation
- Check drain pump wiring
If there was no blockage in the hose, or you removed it, but you still receiving the E18 error code and the machine is not draining, the problem could be the pump. Take the filter out, put the machine on spin, and with the filter out, check to see if the pump impeller is rotating.
If the washing program is over and the impeller did not turn, it’s possible that the pump is faulty.
If your machine is not under warranty, and you would like to replace the pump, just click on this link of the video explaining the procedure on How to replace a Bosch Washing Machine Pump
Also to try and help with this problem on your Bosch washing machine, I have put together a full list of videos below on your washing machine. There are many common questions that people ask about these Bosch´s. Please have a look at the relevant video to your problem, and if you need more help, feel free to come to us on our live appliance chat during working hours.
Common questions people ask about on Bosch WAS28440AU/27 Washing Machine.
Bosch washing machine Won´t Drain, Will not drain, doesn´t drain, does not empty – these are all pump problems, see video on this.
Bosch washing machine Will not start, won’t start, Will not open – this is usually due to the machine still having water in or a door interlock fault,(sometimes this might be a printed circuit board fault) see video on this.
Bosch washing machine Will not spin, Wont spin, will not spin, doesn´t spin, fills up but the drum is not turning, won’t agitate or spin, drum doesn’t move!- these faults can either be motor related, pump related, or there may be a problem with the printed circuit board
Bosch washing machine Does not take conditioner, is not taking in any water.- these are all water valve related, see videos on this.
Bosch washing machine Pumps Use model number to find your pump
If you need any further assistance please feel free to contact me. all the best Paul.
Paul Charmbury
Appliances Engineer
Useful videos on all Bosch Washing Machine repairs
