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Old 11-18-2020, 08:06 PM   #1
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Toilet not holding water

We have a 2018 London Aire with the mansorator toilets both toilets the water seems to drain out slowly till there is very little in it.

Does anyone have the fix for this? Thanks
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Old 11-18-2020, 08:09 PM   #2
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Use some rubber gloves and clean the seal. Then coat it with petroleum jelly. Just a very light coating around the seal. See if that helps. I had to do this every so often when i had my previous motorhome.
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Old 11-18-2020, 08:15 PM   #3
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Is this a Dometic with macerator?


if so, ''one" reason for the water draining, could be the discharge tube with anti siphon going bad.
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Old 11-18-2020, 08:18 PM   #4
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I just replaced my motor/macerator on one of my Dometic toilets, and there is no way for water to drain out. The discharge hose extends up higher than the top of the stool before it dumps in the sewer pipe. It could leak out on the floor, but you should notice that.

What brand of macerator stools do you have?
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Old 11-18-2020, 08:50 PM   #5
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Quote:
Originally Posted by alank View Post
I just replaced my motor/macerator on one of my Dometic toilets, and there is no way for water to drain out. The discharge hose extends up higher than the top of the stool before it dumps in the sewer pipe. It could leak out on the floor, but you should notice that.

What brand of macerator stools do you have?
Yes water can leak out when the discharge loop is lower then bowl water level and if the anti-siphon valve has failed (if it has one)
Either from skipping down or not installed correctly to begin with

Not an uncommon issue

Thetford Tecma Manual --- Pg 17 Last Item
https://www.thetford.com/wp-content/...enceRV-Eng.pdf


Similar problem/fix with Dometic Masterflush Macerator Toilets
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Old 11-18-2020, 08:53 PM   #6
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Quote:
Originally Posted by inlineskater View Post
Use some rubber gloves and clean the seal. Then coat it with petroleum jelly. Just a very light coating around the seal. See if that helps. I had to do this every so often when i had my previous motorhome.


Thank you will try it
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Old 11-18-2020, 08:54 PM   #7
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Quote:
Originally Posted by alank View Post
I just replaced my motor/macerator on one of my Dometic toilets, and there is no way for water to drain out. The discharge hose extends up higher than the top of the stool before it dumps in the sewer pipe. It could leak out on the floor, but you should notice that.

What brand of macerator stools do you have?


Yes it is Dometic
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Old 11-18-2020, 08:57 PM   #8
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Quote:
Originally Posted by Old-Biscuit View Post
Yes water can leak out when the discharge loop is lower then bowl water level and if the anti-siphon valve has failed (if it has one)

Either from skipping down or not installed correctly to begin with



Not an uncommon issue



Thetford Tecma Manual --- Pg 17 Last Item

https://www.thetford.com/wp-content/...enceRV-Eng.pdf





Similar problem/fix with Dometic Masterflush Macerator Toilets


The toilet has not always done this more recently. Was fine first year and half that we’ve had it. Thanks
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Old 11-18-2020, 09:03 PM   #9
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Thank you will try it
No toilet bowl seal used on a macerator toilet

Water level is maintained in bowl by height of pump discharge hose....top of loop higher then water level is what keeps water in toilet bowl
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Old 11-18-2020, 09:43 PM   #10
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I had this same problem on my London Aire. They found that the discharge hose loop was too short. Yes it was a slow leak down.
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Old 11-18-2020, 10:23 PM   #11
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occasionally the valve on the discharge tube goes bad. the slow leak is usually the result. sometimes debris gets stuck in the valve. if you can access the back the toilet, look at the top of the valve, hit the flush, if you see water squirt out of the valve, it is likely bad, or has debris stuck, keeping the valve from closing/sealing completely.


You can use a q-tip while pouring some warm water on top of the valve. gently use the q-tip to clean the valve area, you can also gently push the valve (the black rubber) down while pouring warm water, to see if you can clear the debris. if that works, water level in the bowl should maintain. if not, you need to replace the discharge tube with anti siphon.
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Old 11-18-2020, 10:29 PM   #12
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I am wondering regarding the sensor placement for the Tecma Macerator a toilet.
Are the sensors attached to the outside or inside of the black tank?

This may be silly but I looked at the attachment instructions and I don't see how they could work attached to the exterior of the tank.
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Old 11-19-2020, 06:19 AM   #13
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Quote:
Originally Posted by Old-Biscuit View Post
No toilet bowl seal used on a macerator toilet

Water level is maintained in bowl by height of pump discharge hose....top of loop higher then water level is what keeps water in toilet bowl
I agree with old-Biscuit and TonyD. The level of the water in the bowl is determined by the height of the black discharge hose. During installation if the pipe coming out of the floor is too short it will pull down on this loop. Looking at the newer installation manuals for this toilet they are now showing two ty-raps holding this hose loop up.

Attached are pictures from the 2013 manual and the 2019 manual. Note the ty-raps securing the loop in the picture from the newer manual.
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Old 11-19-2020, 08:19 AM   #14
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The post I made above is accurate for the Dometic 7600 series toilets. Specifically the 7640 model. The OP did not tell us what model he is having trouble with. The 7640 has two different bowl water levels you can switch between, so the bowl water level has nothing to do with the height of the discharge tube. The 7640 discharge tube comes up above the very top of the bowl.

We really need to know which Dometic stool the OP has, and we need to know what model stool the above above pictures represent. I have no idea how many macerator toilet models Dometic makes but some of us are talking apples to oranges while some may be talking apples to apples. No one is giving the model numbers their information is about.
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