Servis Washing Machine Won't Drain Regularly
We have a Servis washing machine 6.5kg 1400 A+A. Recently, it's been failing to pump out the water. So i checked the usual things. Pump filter is clear, and the pump runs on an empty cycle. drainage pipe to sink is clear, as is sump from drum to pump filter. I've had to drain it manually a couple of times, but often it will drain if I put it on a different wash cycle and run it again it pumps out just fine. There doesn't appear to be any pattern to the failures either.
I don't know a lot about washing machines, but I feel like it might be something electronic. Perhaps there is a load sensor that's stopping it from draining before the spin cycle. If it's likely to be electrical, I'll get someone in to look at it. I'm not messing with that!
Thanks 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.
Servis washing machine intermittently fails to drain
- The problem
- A Servis 6.5kg 1400 A+A washing machine was intermittently not pumping out water. The owner reported the pump filter was clear, the drain hose to the sink was clear, and the sump from drum to pump filter was clear. The pump would run on an empty cycle, and the machine would often drain successfully if a different wash cycle was selected and run again. Manual draining was sometimes needed.
- Likely cause
- The discussion supports an intermittent drain fault most likely related either to an intermittent pump issue or an interruption in electrical supply/control to the pump. A sensor or load-balance issue was specifically said not to stop the pump from running. Excessive suds causing an air lock was suggested as a possibility, but this was not confirmed.
- What fixed it
- No confirmed repair was documented. Recommended diagnosis was to determine whether, when the fault occurs, the pump is still running. If the pump runs but no water exits, blockage remains the likely cause. If the pump stops, the likely fault is electrical, the pump cutting out, or control/PCB related. As the fault is intermittent and not resolved in the thread, further diagnosis should be carried out by a suitably qualified appliance engineer.
- Checks to try
- Pump filter checked clear
- Drain hose/pipe to sink checked clear
- Sump from drum to pump filter checked clear
- Pump observed to run on an empty cycle
- Test suggested: run fill/drain without clothes or detergent to rule out excess suds
- Diagnostic check suggested: confirm whether pump is running or stopped when the fault occurs
- Parts or tools mentioned
- Replacement pump
- Replacement PCB
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
4 Answers
On the contrary, any sensor issue would cause the pump to run not stop it. Several "faults" detected will cause the washer to abort and drain the water out for safety or out of balance load sensor will prevent a fast spin but never prevent the pump from running. Check all the advice in my article here - Can’t find a blockage but washing machine still not draining
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one thing not mentioned in the advice is excessive bubbles from soap. If you generate too much lather, there can be an air lock form in the pump. It can take a while for the bubbles to be pushed thru and get the water moving again. You can obviously test this by filling the drum a few times with no clothes or soap, then putting it onto drain. If it works every time, I would recalculate the soap volume.
Thanks for the replies. Nothing seems to work, it's just as intermittent as it was before. Sometimes it runs, sometimes it doesn't. It seems like there is either and issue with the power getting to pump all the time, or the signal from the PCB is not working every time. If it's a faulty PCB, I may as well just buy a new washer, because the replacements start at about £130. A new pump is £25, and while I'm ok tpo drop that amount on the chance that it will fix it, I might just be throwing money away. Have spoken to an engineer on the phone, he said it sounds like an interuption in the power. I at a loss, quite frankly!
The only way to diagnose it is to find out when it stops draining - is the pump still running or not? If the pump is still running but no water comes out it's got to be a blockage. If the pump stops running then it has to be an electrical fault or the pump is cutting out. If it's an intermittent fault then it's usually very involved trying to fix it.
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