Bosch Serie 6 washing machine showing E18 and won't drain
My Bosch Serie 6 WAU28T64GB has stopped mid-cycle with an E18 error and there's water left in the drum. I've checked the obvious — the door seal looks clean — but I can't find the drain filter. Is E18 always a pump or blocked filter issue, or could it be the pressure switch? Any pointers before I call an engineer would be hugely appreciated.
Solution Summary
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Bosch Serie 6 WAU28T64GB E18 error with water left in drum
- The problem
- Bosch Serie 6 WAU28T64GB stopped mid-cycle, displayed E18 and would not drain, leaving water in the drum. The user could not locate the drain filter and asked whether E18 always meant a pump or blockage fault, or if a pressure switch fault was possible.
- Likely cause
- Most strongly supported diagnosis is a draining fault rather than a confirmed failed part. Suggested causes were a blocked pump filter, jammed pump impeller, kinked or incorrectly installed drain hose, or possibly a pump fault. A pressure chamber or pressure switch fault was mentioned as possible but less likely.
- What fixed it
- Locate the lower front filter flap or plinth access, drain the residual water safely, then check the drain pump filter and pump impeller for debris. Also check the drain hose for kinks, crushing or incorrect insertion into the waste/standpipe. If these checks are clear and E18 remains, further diagnosis of the pressure system or pump circuit should be carried out by a suitably qualified appliance engineer.
- Checks to try
- Confirmed E18 fault code with water left in drum
- Door seal visually checked by user
- Advised to find filter access behind lower front flap or plinth
- Advised to drain water before opening filter
- Advised to inspect filter for coins, buttons, hair grips, lint or fabric debris
- Advised to check pump impeller for jamming or looseness
- Advised to check drain hose for kinks, crushing or incorrect installation
- Advised to note whether pump hums or is silent
Safety: Isolate the washing machine from the mains before checking internal drain components. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
E18 on many Bosch washing machines usually points to a draining problem, but it does not automatically mean the pump itself has failed. A blockage, jammed pump impeller, kinked drain hose, or drain installation issue are all common causes. A pressure system fault is possible, but less common.
Before checking anything internal, isolate the washing machine from the mains.
1. Find the filter access On most Bosch Serie 6 models the drain pump filter is behind the small flap at the lower front of the machine, often on the right-hand side. If you cannot see a flap, check the lower plinth area. Some models hide it quite neatly.
2. Drain the water first Put towels down and use a shallow tray. If fitted, pull out the small emergency drain hose next to the filter and empty it bit by bit. If there is no small hose, you will need to slowly loosen the filter cap and let the water out gradually.
3. Check the pump filter and impeller Remove the filter and look for coins, buttons, hair grips, lint or fabric debris. Then look inside at the pump impeller. It should turn with slight resistance but not be jammed or loose.
4. Check the drain hose Make sure it is not kinked, squashed or pushed too far down the standpipe under the sink or into the waste.
5. Listen to the pump If it hums but does not pump, it may be obstructed or failing. If it is completely silent, there could be a pump, wiring, or control issue.
If all of that is clear and it still shows E18, then the pressure chamber/pressure switch system is worth checking, but that is a bit more involved. If you are not confident, it would be sensible to call a qualified engineer. Any mains electrical work should be left to a properly qualified person.
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This answer was generated automatically by the WhitegoodsHelp AI Assistant. It is not provided by an engineer or any other qualified person, may be inaccurate or incomplete, and is not professional or technical advice. Do not rely on it. Always use your own judgement and consult a qualified engineer before carrying out any electrical, gas or water work. Use is entirely at your own risk. See our full Terms of Use.
SAFETY FIRST: READ BEFORE ACTING ON THIS GUIDANCE
Never work on a live appliance
Always unplug it at the mains before going near it with any tools.
Never attempt gas work
By law, gas appliances must only be worked on by a Gas Safe registered engineer. If your fault involves gas, stop and call a professional. Do not attempt it yourself.
Watch for sharp edges
Outer panels are smooth, but internal parts have sharp machined edges. Wear protective gloves and arm sleeves.
Water appliances can leak
Turn off the water supply before disconnecting any hoses.
Know your limits
If you are not confident testing or working inside the appliance, stop and call a professional.
AI guidance, not guaranteed
This response is generated automatically by the WhitegoodsHelp AI Assistant. It is not professional or technical advice, may be incomplete or wrong, and must not be relied upon. Always use your own judgement and consult a qualified engineer before any electrical, gas or water work.
This is general information only and is not professional advice. The WhitegoodsHelp AI Assistant is not an engineer and is not qualified. See our full Terms of Use.
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