Bosch Washer Dryer Wvt12840Gb / 04
Hi
Looking for somehelp please? ?
Ive changed the brushes on the motor of the machine above, as it had been working normally till they failed.
The motor now works fine, but I gota E04 error code.
It is draining and spinning.
This now seams to of cleared but it keeps repeating its cycle
It says 42 mins left then changes to 1 hour 2 mins.
Happens on all cycles
Ive not changed anything bar the brushes.
TIA for any help.
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Bosch WVT12840GB/04 repeats programme time after motor brush replacement
- The problem
- After replacing the motor brushes on a Bosch washer dryer WVT12840GB/04, the motor ran again and the machine drained and spun, but an E04 error appeared initially and then seemed to clear. The main remaining fault was that programmes would not complete properly: the display dropped to 42 minutes then increased to 1 hour 2 minutes, and this repeated on all cycles.
- Likely cause
- The accepted reply suggested the repeating time was more likely due to the machine not detecting a required condition to advance the programme, rather than the brushes alone. Probable areas mentioned were incorrect or poorly seated replacement brushes affecting motor feedback, a disturbed motor/tacho connector or wiring, or a heating/sensing issue. No single cause was confirmed.
- What fixed it
- Recommended action was to reset the appliance by isolating it from the mains for 10–15 minutes, then test a short wash-only cycle with no drying selected to separate wash faults from drying faults. Also advised were checking that the new brushes were the correct type and fitted correctly, inspecting the motor plug and wiring after the motor had been disturbed, and checking whether the machine heated on wash or dry cycles. The thread was marked solved, but no repair or final fix was confirmed in the discussion.
- Checks to try
- Reset by isolating from the mains for 10–15 minutes
- Test a short wash-only cycle with no drying selected
- Check the new motor brushes are the correct type, fitted correctly and moving freely
- Inspect the motor plug and wiring, including tacho-related wiring
- Check whether there is heating on wash cycles or drying cycles
- Parts or tools mentioned
- Motor brushes
Safety: Isolate from the mains before inspecting internal parts. Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
Hi, if the motor brushes were worn right down, it’s quite common for the control to behave oddly for a while afterwards, but the repeating programme time usually points to the machine not seeing one of the conditions needed to move on properly rather than the brushes themselves.
A few checks to narrow it down:
1. Reset and test simply Turn it off, isolate from the mains for 10–15 minutes, then try a short wash only cycle with no drying selected. - If wash cycles finish normally, but washer-dryer cycles keep extending, the fault is likely on the drying side. - If even wash-only cycles repeat or stall, look at sensing, heating or motor feedback issues.
2. Check the new brushes carefully Make sure they are the correct type, fitted the right way round, moving freely in their holders, and bedded onto the commutator properly. Poor contact can cause erratic motor feedback to the PCB.
3. Inspect the motor plug and wiring Since the motor has been disturbed, check the connector is fully home and no wires to the motor, tacho coil, or heater circuit have been pulled or trapped. A weak tacho signal can confuse programme timing.
4. Look for heating problems On wash cycles, is the water heating? On drying cycles, is there any heat at all? Machines often keep extending time if they are waiting to reach temperature.
5. Check airflow/condensing system if the issue is mainly on drying Blockages in the condenser ducting, fan system, or moisture sensing can cause endless drying times.
If it still happens, the next step is proper checks on heater, NTC sensor, tacho and control sensing. Please isolate it from the mains before inspecting internal parts, and use a qualified engineer for any mains or more in-depth electrical testing.
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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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