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Old 10-30-2020, 03:04 PM   #1
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Sealand Electric Flush Toilet - How to replace flush ball seal with no service mode?

I have a Dometic/Sealand 3100 (I believe that's the model number) electric flush toilet, and the water is no longer staying inside the bowl - it's suddenly completely leaking out within 2-3 hours time. I see that you can replace the flush ball rubber seal, but the service mode switch on its circuit board doesn't function. When switching the toggle switch, nothing happens and then the functionality of the toilet completely stops working, requiring me to cut 12VDC power in order to get the toilet to work again.

Also, the instruction PDF mentions that there's an opening in the side of the toilet where you can manually open the flush ball. However, the positioning of the nut inside the opening doesn't allow you to properly get a tool on it to turn it, so that's unable to be used.

How can I replace the flush ball seal in this instance?
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Old 10-30-2020, 05:16 PM   #2
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You can get a new control board now. but you should be able to manually open it using a large flat blade screwdriver (if a socket wont fit).

NWRV Supply has new control boards now.
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Old 10-30-2020, 09:36 PM   #3
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Have you tried you tube.
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Old 10-30-2020, 09:56 PM   #4
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Manual override disconnects the motor from any electrical connections so you can use a screwdriver/socket to manually open/close the flapper through the hole in the porcelain on the left side (facing the bowl), if you have one.

Service Mode opens the flapper and holds it there till you return the switch to the center position.

I had our toilet out and disassembled the mechanism from the porcelain. When I put it back together, I made sure it was assembled correctly and use Plumbers Grease on the rubber seal and the flapper.

Now it will hold water in the bowl for days.

Paul
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Old 10-30-2020, 10:29 PM   #5
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Hoss7, just wanted to let you know replacement control boards are now available.
https://www.irv2.com/forums/f258/con...et-506403.html
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Old 10-30-2020, 10:59 PM   #6
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While You are at it..Order a spare control board...just 'cause
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Old 10-31-2020, 04:24 AM   #7
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Sealand Electric Flush Toilet - How to replace flush ball seal with no service mode?

Hoss7,

Service Mode should open the flapper to allow you to clean the bottom of the rubber seal and apply plumbers grease to help it seal.

DANCO Waterproof Silicone Faucet Grease | Silicone Sealant | Plumbers valve Grease for O-rings | 0.5 oz. | 1-Pack (88693)
by Amazon.com
Learn more: https://www.amazon.com/dp/B000DZFUPC


To change the seal you have to remove the toilet and remove the mechanism from the porcelain.

Seal available here:

https://marinesan.com/base-seals-m-o-plug/

Be careful tightening the three J-bolts holding the mechanism to the porcelain. They only require a very light torque setting. On mine the torque setting was marked on a sticker on the inside of the porcelain. I think it was 21 or 27 in-lbs, or less than 2 ft-lbs. if you overtighten them, your run the risk of breaking the mounting tabs off the porcelain, which likely means replacing the toilet.

I cleaned and lubed my original seal when I had the toilet out and apart and it is holding water for days. I did order the seal, but now carry it as a spare.

Paul
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Old 10-31-2020, 10:02 AM   #8
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Sealand Opus

Sent you a PM...be sure to post results.
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Old 11-05-2020, 11:54 AM   #9
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Thank you to everyone for the replies! I ended up pouring a few cups of straight, undiluted CLR PRO into the bowl and kept adding more as it leaked, and it eventually held the liquid without leaking down. I left the undiluted CLR soak overnight, flushed it thoroughly and it's now holding water without any issue! I purchased a bottle of the Thetford toilet seal conditioner on Amazon ($8), and that has been soaking for two days to condition the seal. So, to everyone reading this thread - definitely try this first!
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Old 11-06-2020, 11:00 AM   #10
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Another trick to keep it sealing is to spray a few shots of water mixed with Blue Dawn dish soap into it daily and let sit. This prevents the hard water build up and acts like a lubricant.
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Old 11-07-2020, 09:03 AM   #11
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I took a Qtip and put some silicon grease on the seal and it has held water for years. Every once in a while I use the Qtip and clean it out.

Safe travels
Dave
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Old 11-08-2020, 02:01 PM   #12
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I took mine out and put it in the dumpser! put in a regular rv toilet.
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Old 11-09-2020, 02:19 PM   #13
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Quote:
Originally Posted by djhinds View Post
I took a Qtip and put some silicon grease on the seal and it has held water for years. Every once in a while I use the Qtip and clean it out.

Safe travels
Dave
Cool. You saved that Qtip for all those years.

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Old 11-10-2020, 07:18 AM   #14
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Talking

CountryB, it did sound like I save the Qtip...... The DW had a big supply of them fort me......

Safe travels
Dave
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