Topping off your TOTO WASHLET+ system with the S7 or S7A WASHLET bidet seat gives you a lot of luxurious perks – including optional automatic flushing. Once you’ve completed the basic WASHLET+ installation process, adding the auto flush kit is a breeze! Watch the video below and keep reading to learn how you can enjoy a completely hands-free bathroom experience in minutes.

Video Chapters:

00:00 – Introduction
00:18 – Step 1 – Turn off water and drain tank
00:38 – Step 2 – Disconnect hose and center column
01:00 – Step 3 – Connect chain and reinstall column
02:26 – Step 4 – Connect and install auto flush controller
03:15 – Step 5 – Plug into seat and install buttons
04:32 – Step 6 – Test the flush

This walkthrough uses the Nexus – one of our favorite WASHLET+ toilets – and the THU857 auto flush kit. The installation process will be the same for all TOTO WASHLET+ toilets with a 1.28-gallon single flush and the THU857 auto flush kit.

What tools do I need to install a TOTO WASHLET+ auto flush kit?

The auto flush kit comes with everything you need to get it up and running. All you’ll need to have on hand is a tape measure! A pair of needle-nosed pliers can also help with connecting the clip to the center column.

Step 1: Turn off the water and drain the toilet tank

1. Turn off the toilet’s water supply using the shutoff valve.
2. Flush the toilet to drain the tank and remove the tank lid.

Step 2: Disconnect the house and center column

1. Unclip the fill tube from the overflow tube and set it off to the side to give yourself more room to work.
2. Twist the center column counterclockwise until you hear a click.
3. Lift the center column up and out.

Step 3: Connect the chain and reinstall the center column

1. With a tape measure, measure the height of the overflow tube.
2. Use the measurements on page 8 of the installation manual to determine which link of the chain to connect the clip to.
   • Approximately 5 1/2″ (140 mm): connect the clip to the top link closest to the plastic sleeve
   • Approximately 5 29/32″ – 6 5/16″ (150-160 mm): connect the clip to the third link down from the plastic sleeve
   • Approximately 6 11/16″ (170 mm): connect to the bottom link farthest from the plastic sleeve
3. Attach the clip to the correct link on the chain, making sure to slide the chain onto the small side of the clip.
4. Using a pair of needle-nosed pliers, connect the clip on the other side of the chain (with the plastic sleeve closer to the end) to the metal loop inside the bottom of the center column.
5. Set the center column back into place and twist it clockwise until you hear it click into place.

Step 4: Connect and install the auto flush controller

1. Attach the clip you connected to the chain in Step 3 to the hole in the plastic lever on the auto flush controller.
2. Slide the bottom of the auto flush controller onto the overflow tube.
3. Remove the end from the fill tube. If there’s a lot of excess or the tube is kinking, you can cut it down to size before you attach it.
4. Connect the fill tube to the tube on the side of the auto flush controller.

Step 5: Plug into the seat and install remote buttons

1. Slide the bidet seat forward and off the mounting bracket so you can access the hole in the toilet that conceals the bidet hose and power cord.
2. Run the cord from the auto flush controller through the hole in the toilet.
3. Remove the plastic cover on the back of the bidet seat (above the bidet hose) by sliding it down.
4. Plug the auto flush controller cord into the seat and replace the plastic cover.
5. Slide the bidet seat back onto the mounting bracket until it clicks into place.
6. Remove the large plastic blank on the top left of the remote control by pushing on the back of it and pulling it off.
7. Slide the new buttons into the top of the remote and click them down into place.

Step 6: Test the flush

1. Turn on the toilet’s water supply and let the tank fill.
2. Press the flush button and make sure the toilet flushes properly.
3. Line up the auto flush controller cord with the cutout in the back of the tank lid and set the lid in place.

With the auto flush kit fully installed and the lid back in place, your WASHLET+ system is all set for convenient automatic flushing!

Need a helping hand?

If you run into any issues installing your auto flush kit, reach out to us! Want your own touchless toilet experience but don’t have auto flushing? We can help you get whatever you need, from an auto flush kit to a full WASHLET+ system.

• Connect with us on our live chat
• Call or text us at 248-974-4030
• Send us an email at [email protected]