1. Introduction
This manual provides comprehensive instructions for the safe and efficient installation, operation, and maintenance of your InSinkErator Master Plumber MP35 1/3 HP Waste Disposer. Please read this manual thoroughly before installation and use, and retain it for future reference.
The InSinkErator Master Plumber MP35 is designed to efficiently grind food waste into fine particles that can be flushed away through your plumbing system. It features durable galvanized steel grind elements and a PVC grind chamber for reliable performance.
Image showing the InSinkErator Master Plumber MP35 1/3 HP Waste Disposer unit.
2. Safety Information
WARNING: Improper installation or operation can result in personal injury or property damage. Always follow these safety precautions.
- Always turn off the power to the disposer at the circuit breaker or fuse box before attempting to install, service, or clean the unit.
- Do not put hands or fingers into the disposer opening.
- Do not dispose of large bones, corn husks, artichokes, or other fibrous materials that can clog the drain.
- Do not dispose of glass, plastic, metal, or other non-food items.
- Ensure the disposer is properly grounded to reduce the risk of electric shock.
- Use only cold water when operating the disposer. Hot water can melt grease and cause clogs in the drain line.
- Keep children away from the disposer during operation.
3. Setup & Installation
3.1 Tools Required
- Screwdriver (Phillips and flathead)
- Pliers
- Adjustable wrench
- Putty knife
- Hammer
- Safety glasses
3.2 Pre-Installation Checklist
- Verify that the existing sink flange opening is compatible with the disposer's mounting assembly.
- Ensure there is an accessible electrical outlet under the sink, or plan for proper wiring by a qualified electrician.
- Confirm that the plumbing connections are ready for the disposer's drain line.
3.3 Installation Steps
- Remove Old Disposer (if applicable): Disconnect power, plumbing, and mounting assembly from the old unit.
- Install Sink Flange: Apply plumber's putty around the sink flange and press it firmly into the sink opening. Secure it from underneath with the fiber gasket, backup flange, and mounting ring. Tighten the mounting screws evenly.
- Connect Dishwasher Drain (if applicable): If connecting a dishwasher, remove the knockout plug from the disposer's dishwasher inlet using a screwdriver and hammer.
- Attach Disposer to Mounting Assembly: Align the disposer's three mounting tabs with the mounting ring. Twist the disposer until the tabs lock into place.
- Connect Plumbing: Attach the disposer's discharge tube to the P-trap. Ensure all connections are tight to prevent leaks.
- Electrical Connection: Connect the disposer to a grounded electrical outlet. If hardwiring, ensure connections are made according to local electrical codes.
- Test for Leaks: Run cold water into the sink and check all connections for leaks. Turn on the disposer briefly to ensure proper operation.
4. Operating Instructions
- Ensure the disposer is properly installed and connected to power.
- Turn on a medium stream of cold water.
- Turn on the disposer by flipping the wall switch.
- Slowly feed food waste into the disposer opening. Do not overload the unit.
- Allow the disposer to run until all food waste is ground and flushed away, and only the sound of the motor and running water is heard.
- Turn off the disposer, then turn off the cold water after a few seconds to flush the drain line.
4.1 What NOT to Put in Your Disposer
- Grease or oil
- Large bones
- Fibrous materials (e.g., corn husks, celery stalks, artichokes)
- Coffee grounds (in large quantities)
- Pasta or rice (can expand and cause clogs)
- Fruit pits
- Glass, plastic, metal, or paper
- Chemical drain cleaners
5. Maintenance
5.1 Cleaning Your Disposer
- Regular Cleaning: Grind small bones or ice cubes to help clean the grind chamber and remove minor buildup.
- Odor Removal: Grind citrus peels (lemon, orange) to freshen the disposer and drain.
- Deep Cleaning: For stubborn odors, turn off the disposer, remove the splash guard, and clean the underside of the splash guard and the top of the grind chamber with a brush.
5.2 Preventing Jams
- Always use a strong flow of cold water when operating the disposer.
- Avoid putting large quantities of food waste into the disposer at once. Feed it gradually.
- Do not dispose of items listed in the "What NOT to Put in Your Disposer" section.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Disposer does not start. | No power; tripped circuit breaker; jammed motor. | Check power supply. Reset circuit breaker. If jammed, turn off power, insert hex wrench into bottom center hole and turn back and forth. Remove object with tongs. |
| Disposer hums but does not grind. | Jammed grind plate. | Turn off power. Use a hex wrench in the bottom center hole to free the grind plate. Remove object with tongs. Press the red reset button on the bottom of the disposer. |
| Leaks from disposer. | Loose connections; cracked housing. | Check and tighten all plumbing connections. If housing is cracked, the unit may need replacement. |
| Unpleasant odors. | Food residue buildup. | Clean the disposer by grinding ice cubes and citrus peels. Refer to the Maintenance section. |
7. Specifications
- Model: MP35
- Horsepower: 1/3 HP
- Grind Elements: Galvanized Steel
- Grind Chamber: PVC
- Product Dimensions: 13 x 7.5 x 7.5 inches
- Item Weight: 13.05 pounds
- Manufacturer: IN-SINK-ERATOR/MASTERPLUMBER
8. Warranty & Support
8.1 Warranty Information
The InSinkErator Master Plumber MP35 Waste Disposer comes with a full 1-year in-home warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
For detailed warranty terms and conditions, please refer to the documentation included with your product or contact customer support.
8.2 Customer Support
If you have any questions, require assistance with installation, or need to report a problem, please contact InSinkErator customer support. Contact information can typically be found on the manufacturer's website or in the product packaging.
When contacting support, please have your model number (MP35) and date of purchase readily available.
