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Old 01-20-2015, 08:51 PM   #1
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Bathroom sinks full, gray tank not.

Anyone experienced this: my bathroom sinks will be full and overflowing when my gray tank is only 3/4 full by sensors. The shower will continue to work and drain long after the sinks overflow until the sensors say full. I checked under sink to make sure the under sink vents are working properly and they seem to be. Not a really big deal because I will not let the sinks overflow but annoying. Model Sandpiper 355RE 2014 Dual Sinks
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Old 01-20-2015, 08:59 PM   #2
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Tank level sensors are notoriously misleading (many times they are flat wrong).
I'm not sure to what you are referring when you say 'under sink vents' but I don't mind saying I could be clueless.

I suspect some sort of construction debris has fallen into your sink drains downstream from their drain "Y" - meaning both sinks are affected. You may have to disassemble a drain pipe and run a wire or snake down it. That's my guesswork at work.
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Old 01-20-2015, 09:03 PM   #3
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Quote:
Originally Posted by Jackfacente View Post
Anyone experienced this: my bathroom sinks will be full and overflowing when my gray tank is only 3/4 full by sensors. The shower will continue to work and drain long after the sinks overflow until the sensors say full. I checked under sink to make sure the under sink vents are working properly and they seem to be. Not a really big deal because I will not let the sinks overflow but annoying. Model Sandpiper 355RE 2014 Dual Sinks
Have you tried to drain the grey tank?
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Old 01-20-2015, 09:09 PM   #4
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The grey water tank capacity is large, are you sure you don't have two grey tanks?
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Old 01-20-2015, 09:20 PM   #5
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When your bathroom sink starts to overflow how full is the black tank?
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Old 01-21-2015, 07:20 AM   #6
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I have the same model. When I open both faucets at the same time in the bath for each sink they will hold water in the sinks. My shower will do the same. My thoughts behind this is due to both sinks not allowing air into the drain causes an air block. When I stop the running water the sinks will bubble, as a milk jug would upside down, and drain slowly.

My unit is on a permanent site and will run into this when trying to fill the tank to flush quickly.


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Old 01-21-2015, 02:18 PM   #7
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I'm with two gray tanks.
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Old 01-21-2015, 02:29 PM   #8
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You are suffering from insufficient venting. You may need an air gap vent, or have one that is not properly functioning anymore.
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Old 01-21-2015, 05:18 PM   #9
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I just had a clogged sink and fished out alot of goo below strainer & above the trap....problem solved. Good luck
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Old 01-21-2015, 08:25 PM   #10
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Quote:
Originally Posted by Jackfacente View Post
Anyone experienced this: my bathroom sinks will be full and overflowing when my gray tank is only 3/4 full by sensors. The shower will continue to work and drain long after the sinks overflow until the sensors say full. I checked under sink to make sure the under sink vents are working properly and they seem to be. Not a really big deal because I will not let the sinks overflow but annoying. Model Sandpiper 355RE 2014 Dual Sinks
Do you happen to have a Hepvo (bellows) trap valve? Installed instead of p-trap. I've seen them temporarily collapse and prevent draining. Open with plumbers plunger. Never use a snake if this valve is in use. Very doubtful if sink drain is clogged only one year old.
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