Siemens extraklasse wm14k280gb has an E21 error that will not clear.
Siemens extraklasse wm14k280gb has an E21 error that will not clear. Can you assist? Your help needed.
What I have done so far:
o Removed the coin/fluff filter and cleared it
o Removed and checked the rubber pipe from drum to drain - clear
o Removed the Hanning drain pump and checked resistance - not open circuit, pump runs
o Removed the drain piping, flushed it through
With each fix I re-tested, no joy.
Whilst I was in there I changed the brushes and sprayed contacts with contact cleaner, Blew the carbon dust away. Motor turns fine.
No matter what I do I cannot clear the E21 error which seems to be a drain fault according to the net - but why it will not clear escapes me.
o In addition I have taken out the control board and it had some black dust on a specific point around two SM diodes? and that dust appeared on both sides of the board in that location but no obvious burning and no obvious source of the dust so assuming it is carbon build up from the brushes? It simply brushed away.
Same exactly as per this video at 0:34 titled Bosch PCB Repair Update on youtube - Link can be provided.
No components seem damaged, no solder joints broken, no obvious overheating. The two SM diodes seem good having the same resistance one way and none the other. Other components look good.
The PCB is a Siemens/Bosch 668675
9000 575 229-02
ako 744115-04
prg 746457-01
ak36 EPW65309
The E21 error appears as soon as the machine is switched on and no combination of pressing the drain switch and twirling the control knob changes anything.
Is it likely to be the PCB? < - this is the real question I need to be answered.
Do need an exact replacement or will another Bosch 668675 type do? I am a dab hand at soldering so I can detach/re-attach a replacement socket to a board that does not have the remote display.
I can check the motor resistances if required.
If anyone can help. This was an expensive machine once upon a time, I have also spent a great deal of time on it, Father has died of covid-19 and I am left with a doubly-incontinent mum with severe dementia and I need this machine to operate as soon as possible!
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.
Siemens Extraklasse WM14K280GB showing E21 that will not clear
- The problem
- A Siemens Extraklasse WM14K280GB washing machine displayed E21 immediately on switch-on and the fault would not clear. The owner had already cleared the coin/fluff filter, checked the drum-to-drain hose, flushed the drain pipework, and tested the Hanning drain pump, which was not open circuit and ran. The motor also turned fine after brush replacement.
- Likely cause
- The accepted reply states that if E21 is being treated as a drain fault but the water has already drained, the machine may not be receiving the signal that the water has gone. The strongest supported diagnosis is therefore a fault in the pressure system rather than the drain pump or PCB. The black soot/dust on the PCB was said to be normal.
- What fixed it
- Recommended action was to investigate the pressure system, as the machine may not be sensing an empty tub. The discussion did not confirm a specific repair or confirm that the PCB needed replacement.
- Checks to try
- Coin/fluff filter removed and cleared
- Rubber pipe from drum to drain removed and checked clear
- Hanning drain pump removed, resistance checked, and pump runs
- Drain piping removed and flushed through
- Motor brushes changed and motor reported to turn fine
- Control board inspected; no obvious damage or broken solder joints seen
- Parts or tools mentioned
- Hanning drain pump
- Motor brushes
- Siemens/Bosch PCB 668675
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
Hi. Black soot on PCB is normal. If it’s a drain fault meaning the water hasn’t drained out - but the water has been drained out, then it could be that it’s not getting the signal that the water has gone. Faults on pressure system
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