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Old 07-04-2017, 08:59 PM   #1
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Dometic Masterflush Leak Fixed

I figured I'd post this incase someone else has this issue. We have a new 30 bunk that we are full timing in. The toilet had a slow leak that would pool a couple tea spoons of water at the base of the toilet overnight. I took it apart, found a semi loose clamp, tightened it up along with all the other fittings, and that solved the problem. The leak appeared to be from where the large clamp runs around the pump itself. It is pretty neat how the toilet works though. I figured I'd post some pics in case someone else needed to pull theirs down the road. Its super simple how it works. Its basically just an electric pump with a small water inlet and a larger outlet that is bolted to the floor with two L brackets.
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Old 08-06-2017, 06:19 AM   #2
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Not fixed after all

Well, I thought I had fixed it, but I was wrong. I have had it apart three different times now and can not figure out where it is leaking from. All the fittings are snug and locked down tight. I'm beginning to think there is a small crack in the toilet itself or something. Every time I have taken it apart the pump and all the joints are dry. I just sent Dometic support an email. I guess we will see what they are willing to do. We are active duty military getting ready to move to a new duty station and just rented out our house here, so we are fully timing in the trailer right now. The dealer we bought it from is 3hrs away and it would be a major pain to have to bring it back to them. I'm hoping that Dometic will be willing to send me another toilet or send a mobile mechanic to look at it. Any advice?
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Old 08-07-2017, 08:21 PM   #3
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Is your tank full when it leaks?

I have the exact same trailer and toilet. Never had an issue until now (today actually) I totally filled the tank to sanitize it 3 times and now I just got a leak. I think it is backing up from the drain.

My advice is to keep working on it. Everything on the trailer will break so you need to know how to fix everything....sorry, not what you want to hear I'm sure, just my experience.
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Old 08-07-2017, 08:32 PM   #4
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Another thought, maybe fill the bowl and shut the water off and open a faucet to lose the water pressure. If it leaks, it would be coming from the drain side. If it doesn't leak, then it is likely coming from supply side especially if it leaks again when the water is turned back on.
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Old 07-20-2018, 09:02 AM   #5
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Hi there....did you ever figure this out? We have the same issue in our 2019 30 bunk and are 6 hours from an airstream dealer. Please let me know.
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Old 07-21-2018, 07:38 AM   #6
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Quote:
Originally Posted by saltystreamr View Post
Hi there....did you ever figure this out? We have the same issue in our 2019 30 bunk and are 6 hours from an airstream dealer. Please let me know.
I ended up calling dometic and they replaced it under warranty. I told them what happened and sent them a pic of the serial number. They just sent me a whole new unit and I switched it out myself. Apparently, they sometimes have a small internal leak in the porcelain that gets missed and the only way is to replace the toilet.
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