Bosch
Bosch Washing Machine Drain Pump & Filter Body921243
Suitable for Bosch, Balay, Constructa, Gaggenau, Neff
Stock Code: 921243
£27.05inc. VAT
£22.54 ex. VAT
Due Back In Stock: 10 Aug 2026
Moderate DIY repair
A confident home repairer can do this with basic tools.
01
Compatibility Check
02
What this part does
Pumps the waste water out and traps debris before it reaches the pump.
03
Will this fix my appliance?
Tick the symptoms your appliance is showing. We’ll tell you how confident we are this part is the fix.
04
Error codes related to this part
Error codes are model dependent, so the same brand may have more than one listed.
| Code | Brand | What it means | Confidence |
|---|---|---|---|
| E18 | Bosch | Means a drainage failure, where the machine cannot empty water within the allowed timeframe. It is usually caused by a blocked drain pump filter or a kinked hose. | High |
| E2 | Bosch | Means a drainage failure that stops the machine mid-cycle because water is not emptying within the required time. It is usually caused by a blocked pump filter, a kinked drain hose, or a failed drain pump. | High |
| E20 | Bosch | Means a drainage problem where the machine cannot empty water and stops the cycle to prevent flooding. It is usually caused by a blocked filter, an obstructed pump, or a kinked drain hose. | High |
| E28 | Bosch | Means a flow sensor fault, where the water is not draining properly or the sensor cannot detect water flow correctly. It is usually caused by a malfunctioning turbidity sensor (dirty water sensor) or a drainage blockage. | Medium |
| E4 | Bosch | Means a drainage failure. It is usually caused by a blocked pump filter, a kinked drain hose, or a faulty drain pump. | High |
| F3 | Bosch | Means a drainage failure, where the machine has not emptied water within a set time. It is usually caused by a blocked pump, filter, or hose. | High |
| F5 | Bosch | Means a drainage failure where the machine cannot empty water, or on certain models a motor fault. It is usually caused by a blocked filter, an obstructed drain hose, a faulty drain pump, or worn carbon brushes. | High |
| F7 | Bosch | Means a drainage system fault that prevents water from emptying and triggers a door lock safety issue. It is usually caused by a blockage in the filter or drain hose. | High |
| F8 | Bosch | Means a drainage problem. It is usually caused by a bent pipe connected to a pressure sensor, or debris or mechanical failure in the drain pump. | High |
| F9 | Bosch | Means a drainage failure where the machine cannot drain water, causing it to stop mid-cycle. It is usually caused by a blocked pump filter, clogged hoses, or a faulty drain pump. | High |
| E12 | Siemens | Means the machine cannot empty water properly. It is usually caused by a blocked drain filter, an obstructed drain hose, or a faulty drain pump. | High |
| E18 | Siemens | Means the machine has failed to drain. It is usually caused by a blocked drain pump, a clogged filter, or a kinked drain hose. | High |
| E2 | Siemens | Means the machine cannot detect that the door is securely closed, or it is unable to drain water. It is usually caused by a faulty door lock or a drain pump that is not operating. | Medium |
| E21 | Siemens | Means the machine cannot empty water within the time allowed, taking too long to drain and prompting a shutdown to prevent flooding. It is usually caused by a blocked pump filter, an obstructed drain hose, or a faulty drain pump. | High |
| E3 | Siemens | Means the appliance is not draining water properly. It is usually caused by a blocked drain pump, a clogged filter, or a kinked hose. | High |
| E30 | Siemens | Means there is a problem with the drainage system, with the outlet hose connected too high, kinked, trapped, or extended too far, or the drain pipe or outlet hose blocked. It is usually caused by a displaced or blocked drain hose. | High |
| E36 | Siemens | Means the machine cannot empty water within the time allowed. It is usually caused by a blocked filter, an obstructed drain hose, or a faulty pump. | High |
| E4 | Siemens | Means water is not draining from the machine, or the door is not locked properly so the cycle cannot run. It is usually caused by a blocked filter or pump, or a door that is not locking. | High |
| E6 | Siemens | Means the machine cannot empty water within the designated time. It is usually caused by a blocked pump filter, a kinked drain hose, or a faulty drain pump. | High |
| E8 | Siemens | Means there is a drainage failure, water pump issue, or water level error. It is usually caused by blocked supply hoses or filters, or a drain pump that is not operating. | High |
| E81 | Siemens | Means the door mechanism is faulty and preventing unlocking, or the pump cannot drain water, stopping the cycle from finishing. It is usually caused by a faulty door lock or a blocked drain pump. | Medium |
| F3 | Siemens | Means the machine has not emptied water from the drum within the expected time, often stopping mid-cycle with water still inside. It is usually caused by a blockage, a drain pump that is not operating, or a jammed filter. | High |
E18High
Bosch
Means a drainage failure, where the machine cannot empty water within the allowed timeframe. It is usually caused by a blocked drain pump filter or a kinked hose.
E2High
Bosch
Means a drainage failure that stops the machine mid-cycle because water is not emptying within the required time. It is usually caused by a blocked pump filter, a kinked drain hose, or a failed drain pump.
E20High
Bosch
Means a drainage problem where the machine cannot empty water and stops the cycle to prevent flooding. It is usually caused by a blocked filter, an obstructed pump, or a kinked drain hose.
E28Medium
Bosch
Means a flow sensor fault, where the water is not draining properly or the sensor cannot detect water flow correctly. It is usually caused by a malfunctioning turbidity sensor (dirty water sensor) or a drainage blockage.
E4High
Bosch
Means a drainage failure. It is usually caused by a blocked pump filter, a kinked drain hose, or a faulty drain pump.
F3High
Bosch
Means a drainage failure, where the machine has not emptied water within a set time. It is usually caused by a blocked pump, filter, or hose.
F5High
Bosch
Means a drainage failure where the machine cannot empty water, or on certain models a motor fault. It is usually caused by a blocked filter, an obstructed drain hose, a faulty drain pump, or worn carbon brushes.
F7High
Bosch
Means a drainage system fault that prevents water from emptying and triggers a door lock safety issue. It is usually caused by a blockage in the filter or drain hose.
F8High
Bosch
Means a drainage problem. It is usually caused by a bent pipe connected to a pressure sensor, or debris or mechanical failure in the drain pump.
F9High
Bosch
Means a drainage failure where the machine cannot drain water, causing it to stop mid-cycle. It is usually caused by a blocked pump filter, clogged hoses, or a faulty drain pump.
E12High
Siemens
Means the machine cannot empty water properly. It is usually caused by a blocked drain filter, an obstructed drain hose, or a faulty drain pump.
E18High
Siemens
Means the machine has failed to drain. It is usually caused by a blocked drain pump, a clogged filter, or a kinked drain hose.
E2Medium
Siemens
Means the machine cannot detect that the door is securely closed, or it is unable to drain water. It is usually caused by a faulty door lock or a drain pump that is not operating.
E21High
Siemens
Means the machine cannot empty water within the time allowed, taking too long to drain and prompting a shutdown to prevent flooding. It is usually caused by a blocked pump filter, an obstructed drain hose, or a faulty drain pump.
E3High
Siemens
Means the appliance is not draining water properly. It is usually caused by a blocked drain pump, a clogged filter, or a kinked hose.
E30High
Siemens
Means there is a problem with the drainage system, with the outlet hose connected too high, kinked, trapped, or extended too far, or the drain pipe or outlet hose blocked. It is usually caused by a displaced or blocked drain hose.
E36High
Siemens
Means the machine cannot empty water within the time allowed. It is usually caused by a blocked filter, an obstructed drain hose, or a faulty pump.
E4High
Siemens
Means water is not draining from the machine, or the door is not locked properly so the cycle cannot run. It is usually caused by a blocked filter or pump, or a door that is not locking.
E6High
Siemens
Means the machine cannot empty water within the designated time. It is usually caused by a blocked pump filter, a kinked drain hose, or a faulty drain pump.
E8High
Siemens
Means there is a drainage failure, water pump issue, or water level error. It is usually caused by blocked supply hoses or filters, or a drain pump that is not operating.
E81Medium
Siemens
Means the door mechanism is faulty and preventing unlocking, or the pump cannot drain water, stopping the cycle from finishing. It is usually caused by a faulty door lock or a blocked drain pump.
F3High
Siemens
Means the machine has not emptied water from the drum within the expected time, often stopping mid-cycle with water still inside. It is usually caused by a blockage, a drain pump that is not operating, or a jammed filter.
Don’t see your code? Different model years sometimes use different codes. Get in touch with our parts team and we’ll help you identify the right replacement.
05
Fitting Guidance
MediumGeneral fitting guidance. The exact steps can vary slightly with the make and model of your washing machine.
Safety: Switch off and unplug at the mains before you start.
You’ll needScrewdriverPliersTowelShallow tray
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06
Specifications
- Part Number
- 921243
- Genuine Spare Part
- No
07
More Details
This is a high-quality drain pump and filter body for your wash cycle’s draining phase. Pumps the water out of the machine through the drainage hose.
The filter body housing holds a filter that catches lint, debris, and foreign objects from the laundry water. Keeps them from clogging or damaging the drain pump.
Have you recently checked a wash load only to see soaked clothes? This shows an incomplete cycle, a tell-tale sign of a failing drain pump. You should change it with this replacement part.
This drain pump and filter body suits Balay, Bosch, Constructa, Gaggenau, Neff, Pitsos, Profilo, Siemens, and Tecnik washing machines.
Before ordering, please verify that this kit works for your model using our compatibility checker.
08
Customer Reviews (2)
4.52 reviews
5
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4
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Good product
Chose this product because it was good value and was an ideal replacement. The part arrived quickly and was fairly easy to see fit.
Ronnie Miller · Dumfries ·
Quality
Value
Ease of Fitting
Drain Pump and Filter Body
I brought the drain pump as the one on my Siemens IQ500 washing machine had packed in. I ordered the pump from Ransom Spares and it didn't take long to turn up. I found a video on YouTube that related to a Bosh washing machine that looked similar to my Siemens and I just followed that to disassemble the machine down to the pump. You have to take off the door seal so you will require a handled hook to take the door seal spring off and to refit it. But apart from that its straight forward to get to the pump to remove it and refit. I was in two minds whether to just by the pump on its own for about £10 or buy the pump and the housing for £20. I decided for the latter and I am glad I did as splitting the old pump was a bit of a pain and due to the age of the old housing, the plastic was a bit brittle and I snapped off a lug on the housing. Anyway I found it easy to fit and my washer is working. Excellent service from Ransom Spares as normal and they saved me a lot of money. I hopes this helps someone? Thanks.
Ian Price · HOUGHTON LE SPRING ·
Quality
Value
Ease of Fitting