Scooba 5800 goes into drying mode too quickly+pump error

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Scooba 5800 goes into drying mode too quickly+pump error

Postby lingon27 » May 29th, 2019, 3:58 pm

My scooba 5800 ended one cycle with the 4-note tone and then one beep, which is pump malfunction. In subsequent runs it goes into drying mode after about 30 seconds, but while running it is laying down solution.

Running the self-test, it passes both pump tests and squirts out solution. I can see solution come out of both pump nozzles - not in a stream, but one side squirts maybe 1/8 tsp and then the other side. I can't find any videos of what the pump test squirts should look like.

The battery charges up to about 16volts, and after running it through 2 of its cycles of "run for 30 seconds then start drying", it was the same voltage. I haven't tested the battery with a load, and the battery is probably due to die. But I didn't think I'd get a pump malfunction error due to battery issues.

Any suggestions for what to try next?

I also tried to read through the scooba technical paper linked on this site, but kept getting bad links and missing pages - is it whole anywhere, or is that what there is?

Thanks.
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Re: Scooba 5800 goes into drying mode too quickly+pump error

Postby vic7767 » May 29th, 2019, 5:20 pm

The iRobot Scooba Service Manual PDF can be downloaded from here:

http://choisirsonaspirateur.info/wp-con ... Manual.pdf

No missing pages.
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Re: Scooba 5800 goes into drying mode too quickly+pump error

Postby lingon27 » May 29th, 2019, 8:54 pm

Thanks - I found the service manual. I mean the technical pages written by G. Plews, the most working link I found was http://gsplews.lkgnet.com/gsp/Scooba/ScbaTech.htm but many links were broken.
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Re: Scooba 5800 goes into drying mode too quickly+pump error

Postby vic7767 » May 30th, 2019, 12:17 am

Gordon warned us that his work may disappear due to changes with his web provider. The pump should output a squirt from both nozzles at the same time. Not alternating.
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Re: Scooba 5800 goes into drying mode too quickly+pump error

Postby lingon27 » May 30th, 2019, 2:48 pm

I get one squirt from left side, then one squirt from right side, repeat. I tried my old scooba whose vacuum failed, and it pumped the same way. Looking at this video: https://www.youtube.com/watch?v=_188jiTdNj0
and looking at this photo: http://ptgmedia.pearsoncmg.com/images/a ... /fig10.jpg
it seems that it alternately pumps to each side, so my scooba pump is acting normally.

What condition causes the scooba to trip the pump malfunction alarm? In my searches I've only found the check tank error, but I'm not getting that.
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Re: Scooba 5800 goes into drying mode too quickly+pump error

Postby lingon27 » May 30th, 2019, 4:39 pm

I ran the self test right after it went into drying mode while running, and the pump didn't work. I did the "bang it on the side" fix for the pump, and got it to pump again. I tried priming the pump with warm water and a few drops of mineral oil, per viewtopic.php?f=1&t=8732&start=20 but that didn't help.

Anyway, my current guess is that the pump stalled, overloaded the current limit, and that's what triggered the pump malfunction alarm. Next step is to disassemble it all and check out the pump, perhaps re-solder the contacts in case that's the issue.
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