Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Eridanus ERI-ST031-S Smart Toilet. Please read thoroughly before use to ensure proper function and safety.
Safety Information
Safeguards & Precautions
Observe the following safety measures to prevent injury or damage to the product:
- Prevent Low Temperature Scald: The heated seat and water temperatures are adjustable. Use settings appropriate for your comfort level to avoid burns.
- Overheating Prevention: The unit is equipped with sensors to prevent overheating of components. Do not obstruct ventilation.
- 12V Safety Voltage: Internal components operate at a safe 12V voltage.
- Leakage Protection: Regularly inspect water connections for any signs of leakage.
- Water Pressure Protection: Ensure water supply pressure is within the recommended range for optimal operation.
- IPX4 Waterproof: The toilet is designed with IPX4 water resistance, protecting against splashes.

This image illustrates the various safety features integrated into the Eridanus Smart Toilet, ensuring user protection and product durability.
What's in the Box
Please verify that all the following components are included in your package:

The package includes the Eridanus Piedmont II Smart Toilet (Model ERI-ST031-S), a remote control, wax ring, angle valve, flange and mounting bolts, a user manual, and a footprint template for installation.
- Piedmont II Smart Toilet ERI-ST031-S
- Remote Control
- Wax Ring
- Angle Valve
- Flange & Mounting Bolts
- User Manual
- Footprint Template
Setup & Installation
Installation should be performed by a qualified professional or a person with adequate plumbing knowledge. Ensure all local plumbing and electrical codes are followed.
Pre-Installation Checks:
- Verify all components listed in "What's in the Box" are present.
- Ensure a standard 120V AC electrical outlet with GFCI protection is available near the installation area.
- Confirm water supply line compatibility. An adapter may be required for certain North American plumbing configurations (e.g., a "Nibco 604-2 MA FTG ADAPT Size 1/2in" adapter for compression fit ends).
Installation Steps (Overview):
- Prepare the installation area by removing the old toilet and cleaning the flange.
- Position the new toilet over the flange, ensuring proper alignment. It may be necessary to temporarily remove the toilet seat to access mounting bolts for easier alignment.
- Secure the toilet to the floor using the provided flange and mounting bolts.
- Connect the water supply line to the toilet's inlet valve. Ensure a leak-proof connection.
- Connect the power cord to a GFCI-protected electrical outlet.
- Test all functions (flushing, bidet, heated seat, etc.) before final use.

This diagram provides critical dimensions for installation planning, including side, front, and top views of the toilet.
Operating Instructions
Digital Screen Display
The digital screen display on the top of the toilet shows current temperature settings for the seat, water, and air dryer, based on the last selected mode.

The digital screen provides real-time feedback on selected settings.
Control Knob
The side control knob offers quick access to primary toilet features:
- Clockwise Twist: Activates Bidet Wash. Twist again for Oscillating Mode.
- Counterclockwise Twist: Activates Rear Wash. Twist again for Oscillating Mode.
- Short Press (Unseated): Initiates Flushing Session.
- Short Press (Seated): Activates Air Drying.

The control knob simplifies common functions with intuitive twists and presses.
Remote Control
The included remote control provides comprehensive control over all smart toilet functions, including water temperature, seat temperature, air dryer temperature, water pressure, nozzle position, and various wash modes.

The remote control allows for personalized adjustments to enhance comfort and hygiene.
Bidet Wash Options
The smart toilet offers advanced bidet wash options for a customizable and thorough cleaning experience:
- Rear Wash: Standard posterior cleansing.
- Bidet Wash: Gentle feminine cleansing.
- Oscillating Mode: Moves the nozzle back and forth for a wider cleaning area.
- AquaPulse: Pulsating water stream for enhanced cleaning.
- ThermoSoothe: Warm water for a soothing experience.
The self-cleaning wand automatically rinses itself before and after each use, ensuring hygiene. The spray nozzle angle is adjustable for superior cleanliness and comfort.

This image details the various bidet wash modes and the self-cleaning function of the nozzle.

The instant heating system provides warm water for bidet functions, with adjustable temperature levels.
Flushing Options
The Eridanus Smart Toilet provides multiple efficient flushing options for convenience and hygiene.
- Foot-Sensor Flush: Hands-free flushing by gently tapping the foot sensor at the base of the toilet.
- Off-Seat Auto Flush: Automatically flushes when you stand up, offering a hands-free experience. This can be disabled by pressing and holding the "height/low" button on the remote (one beep for ON, two beeps for OFF).
- Power-Assisted Flush: Utilizes power to generate a forceful siphonic jet flush, creating a powerful swirling motion in the bowl for a quick, hushed, and thorough cleanup.
- Blackout Flush: Ensures flushing capability even during power outages.
- Remote Control Flush: Activate flush via the remote control.
- Control Knob Flush: Short press the control knob when unseated to flush.

This image illustrates the various flushing methods available.

A visual representation of the powerful, power-assisted flush system.
This video demonstrates the flushing action of the Eridanus Smart Bidet Toilet.
Comfort Features
- Heated Seat: Enjoy a heated seat with 4 levels of adjustable temperature for ultimate comfort, especially in colder environments.
- Warm Air Drying: After cleansing, a warm air dryer with 4 levels of adjustable air temperature provides a comfortable and efficient drying experience, reducing toilet paper usage.
- Night Light: An integrated night light and ambient light provide gentle illumination for comfortable, sleep-friendly evenings.
- Soft Close Seat & Lid: The seat and lid feature a soft-close mechanism, preventing slamming and ensuring quiet operation.

This image highlights the heated seat and warm air drying features, both with adjustable temperature settings.

The night light provides subtle illumination for nighttime use.
Pre-Wet Function
The pre-wet function automatically moistens the toilet bowl upon the user sitting down, helping to prevent waste from adhering to the surface.

The pre-wet function helps maintain cleanliness.
Maintenance
Regular cleaning and maintenance will ensure the longevity and optimal performance of your Eridanus Smart Toilet.
- Use mild, non-abrasive cleaning solutions. Avoid harsh chemicals or abrasive scrubbers that could damage the surface or electronic components.
- Clean the exterior surfaces with a soft, damp cloth.
- The bidet wand is self-cleaning; however, occasional manual cleaning with a soft brush and mild soap may be performed if necessary.
- Periodically check water connections for leaks.
Troubleshooting
This section addresses common issues you might encounter. If a problem persists after attempting these solutions, please contact customer support.
Common Issues & Solutions:
- No Water Flow / Weak Bidet Spray: Check water supply valve is fully open. Ensure water pressure is adequate. Verify water connection adapter is correctly installed and not leaking.
- No Power / Functions Not Working: Check if the power cord is securely plugged into a GFCI outlet. Verify the GFCI outlet has not tripped. Ensure the toilet's power is turned on (if applicable via remote or control knob).
- Auto Flush Not Working: Ensure the "Off-Seat Auto Flush" feature is enabled via the remote control (one beep for ON, two beeps for OFF).
- Unusual Noises: Some operational noises are normal for smart toilets due to internal pumps and heating elements. If noises are excessive or unusual, contact customer support.
- Water Leakage: Immediately turn off the water supply. Check all connections for tightness. If leakage persists, contact customer support.
Specifications
| Feature | Detail |
|---|---|
| Model Number | ERI-ST031-S |
| Brand | Eridanus |
| Color | White |
| Material | Polypropylene (PP) |
| Installation Type | Floor Mounted |
| Item Weight | 103.6 pounds |
| Package Dimensions | 31.89 x 25.6 x 20.08 inches |
| Batteries Required? | No |
| Seat Material Type | Polypropylene (PP) |
| Rough-in | 12 inches (approx.) |
| Height (overall) | 37 1/4 inches (approx.) |
| Depth (overall) | 19 inches (approx.) |
| Seat Height | 16 1/2 inches (approx.) |
| Width (overall) | 18 3/4 inches (approx.) |
Warranty & Support
Eridanus offers a one-year limited after-sales support, including spare parts availability and prompt technical assistance. Our customer service team is available 24/7 to assist with any inquiries or issues.
Contact Information:
For technical support or warranty claims, please refer to the contact details provided in your product packaging or visit the official Eridanus website.

Eridanus is committed to providing excellent customer support.





