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Old 08-03-2015, 09:34 PM   #1
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Thetford Macerating Toilet

This is probably a venting problem, but as my black tank nears full, the toilet will not retain any water after a flush. Water that is supposed to stay in the bowl after flush get's sucked out, leaving the bowl dry.

Empty black tank, everything is fine again.

This is only on this particular toilet. Have standard marine type head in the half bath, never exhibits the symptom.

Any plumbers out there? Anyone else had this issue? Maybe I should regard as a "feature" since I always know when the black tank is nearly full.

Boowho??
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Old 08-03-2015, 10:18 PM   #2
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Is the control panel toilet symbol red or yellow when it acts up?


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Old 08-03-2015, 10:25 PM   #3
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Is the control panel toilet symbol red or yellow when it acts up?


Wayne
No.... Always Green.....

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Old 08-03-2015, 10:39 PM   #4
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That's strange mine turns yellow when tank gets almost full and then turns red when full. Of course it won't flush when red.


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Old 08-03-2015, 10:55 PM   #5
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I believe it is a feature. My rear bath toilet acts similar, but I haven't paid much attention to the lights.

What is strange on mine is that it seems to be wired to the grey tank. When the grey tank gets full my rear toilet won't flush. Strange huh?
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Old 08-04-2015, 07:23 AM   #6
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Thetford Macerating Toilet

Upon delivery I discovered that FR installed the dump valves backwards so the black had a gray handle and gray had a black handle.
If they did that they could easily wired things wrong.

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Old 08-04-2015, 09:18 AM   #7
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Dan I have reached the conclusion that mine is wired to grey tank as well.
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Old 08-04-2015, 09:33 AM   #8
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Dan I have reached the conclusion that mine is wired to grey tank as well.
Must be a thing with the 2014 390RB model..
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Old 08-04-2015, 11:03 AM   #9
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Mine was wired wrong as well and always showed yellow. Had the dealer fix and ended up with sensors on grey and black took another repair shop and they corrected the problem and found the root cause was the sensors had been placed on the tank behind a metal brace a phone call to Thetford revealed that this would cause interference with the sensors causing false readings after modifying the bracket to allow clearance for the sensor all is good.
Also, by design the water will not fill if sensor starts reading full and will stop flushing this is per owners manual.
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Old 08-04-2015, 11:43 AM   #10
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That's strange mine turns yellow when tank gets almost full and then turns red when full. Of course it won't flush when red.


Wayne

Mine used to do that..... That feature of the toilet was disabled when my SeeLevel gauges were installed. I don't believe that would have any bearing on my problem.

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