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Old 12-06-2017, 02:13 AM   #1
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State: California
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THOR #8323
Drains

Not sure where to start. My Galley sinks are not draining and I was going to pull the p-trap under the sink to see if it was plugged up but then I noticed this. I was checking the led control panel and I observed this.

The back black tank is empty
The back gray tank is empty
The mid black tank is empty
But the mid gray tank reads full - is this why the sink wonít drain. Where can I start to look.

My sewer line is connected and I pulled both levers for black and gray tanks. Is there another lever I missed? Any suggestions would be appreciated
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Old 12-06-2017, 02:16 AM   #2
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Brand: Thor Motor Coach
Model: 2017 Miramar 34.4
State: Florida
Posts: 295
THOR #9721
I have a 34.4 with one gray. My shower and kitchen sink drain to it. How about your mid tank? Is there more than one thing that drains to it so you can determine if is consistent?

The first thing that come to mind is that your roof vent is clogged.
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2017 Miramar 34.4
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Old 12-06-2017, 02:20 AM   #3
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Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 390
THOR #8180
One wa to find out. Begin draining the mid-gray tank and observe the sink drain.
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Old 12-06-2017, 02:26 AM   #4
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Where is the mid gray tank located?
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Old 12-06-2017, 02:31 AM   #5
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Brand: Thor Motor Coach
Model: ACE 30.2
State: Massachusetts
Posts: 390
THOR #8180
If you have 2 black and 2 gray tanks they would be in a compartment forward of the rear most tanks. They would be on the same side as the rear as well. owners manual should indicate the location.
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Old 02-11-2018, 11:21 AM   #6
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Brand: Thor Motor Coach
Model: Miramar 34.2
State: Alaska
Posts: 7
THOR #4318
My Miramar has 1 black and 1 grey tank. If your black tank empties and your bathrooms does not have sewer odors, I think your roof vent is good. I am wondering if your gray waste system has a physical clog preventing water to drain Into the tank. The other possibility is the tank is full and you can not empty the wastewater. Thor Customer Service has blueprints for your motorhome model. They will email copies to you.
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