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Shower drain pump

Discussion of AC's, plumbing and sanitation related issues.
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Topic author United States of America
Killin time
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Shower drain pump

Postby Killin time » August 15th, 2017, 12:21 pm

Is it normal for the shower drain pump to run occasionally for a few seconds at a time? Not for pumping shower water out, but for some other unknown reason, perhaps for pumping condensation water from the AC unit? It never seemed to do that before but now it comes on every half hour or so.


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Re: Shower drain pump

Postby Viper » August 15th, 2017, 2:03 pm

It's normal if water from some source is slowly draining into it such as condensate. Are you sure you're hearing the sump or is it your fresh water pump that comes on periodically? If it's your fresh water pump instead and there is no demand when it happens, you either have a system leak or a faulty pump. Don't forget that if you have an ice maker and it's in the process of making ice, the pump will also come on periodically as the unit calls for water.
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Re: Shower drain pump

Postby mjk1040 » August 15th, 2017, 7:11 pm

KT, my best guess is that the check, (choker) valves are gone on the shower sump. They are located in the hose between the pump and exit fitting. If they are in fact gone the shower sump pump will pump the water out, shut off, the water will then flow back into the sump, fill up faster and pump again. Your AC unit and the shower drain should be the only 2 drains into the shower sump. Just replaced ours in our 1998 355 AC/MY. :beergood:
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Re: Shower drain pump

Postby tomschauer » August 15th, 2017, 9:26 pm

As mentioned, the shower(s) and a/c drain into the shower sump(s). So when your a/c is running, yes the sump will run periodically. These pumps also need cleaned once in awhile, especially if you use your shower(s) often. Soap, hair etc. will build up, sometimes on the float switch causing short cycling and also stinky bilge as they are not a sealed unit.
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Topic author United States of America
Killin time
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Re: Shower drain pump

Postby Killin time » August 15th, 2017, 9:43 pm

The sound is definitely the shower pump. I'm going to think positively and believe it's just more condensation from the AC unit due to the higher humidity. And thank you all for your ideas. :captain2:
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Re: Shower drain pump

Postby mjk1040 » August 16th, 2017, 8:25 pm

Also, if you do use the aft cabin shower, make sure after showering u let the water run for 5 minutes or so to allow flushing of the soap out of the shower sump so u don't get a funky smell and u'll think is the toilet tank.
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I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
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Topic author United States of America
Killin time
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Re: Shower drain pump

Postby Killin time » April 19th, 2018, 11:55 am

I discovered the float switch was sticking. Replaced it and the pump. Quick and easy.

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Re: Shower drain pump

Postby Viper » April 19th, 2018, 6:34 pm

Thanks for the follow up Kt :down:
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Re: Shower drain pump

Postby mjk1040 » April 19th, 2018, 7:23 pm

Yep another optional problem. Bad pump or float valve! Thanks for posting your solution to your problem, it helps us all!
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1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
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