Introduction
The Rival MT660 is a versatile kitchen appliance combining the functions of a microwave oven and a toaster oven into a single unit. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your appliance.
Key features include:
- Bakes, broils, toasts, defrosts, and microwaves.
- Nonstick interior for easy cleaning.
- Electronic controls with timer, preset functions, and digital clock.
- Glass turntable for even defrosting and reheating in microwave mode.
- 1500-watt toaster oven and 700-watt microwave.
Important Safety Instructions
WARNING: To reduce the risk of fire, electric shock, injury to persons, or exposure to excessive microwave energy, read all instructions before using the appliance.
- Do not operate the oven if it has a damaged cord or plug, if it is not working properly, or if it has been damaged or dropped.
- Ensure proper ventilation around the appliance. Do not block any ventilation openings.
- Do not heat liquids or other foods in sealed containers as they are liable to explode.
- Do not use metal utensils or foil in the microwave mode.
- Always use oven mitts when handling hot items from the toaster oven. Surfaces become hot during operation.
- Unplug the appliance from the outlet when not in use and before cleaning.
Product Overview
Familiarize yourself with the control panel and components of your Rival MT660.

Image: The control panel of the Rival MT660, showing the digital display, mode selection buttons (Microwave, Bake, Broil, Toast), arrow buttons, Defrost, Timer, Preset, Popcorn, Beverage, Reheat, Start, Clock, and Pause/Clear buttons.
Main Components:
- Control Panel: Digital display and various function buttons.
- Oven Cavity: Nonstick interior for both microwave and toaster oven functions.
- Glass Turntable: Used for microwave cooking to ensure even heating.
- Crumb Tray: Removable tray for collecting crumbs in toaster oven mode.
- Baking Pan & Chrome Rack: Accessories for toaster oven use.
Setup
- Unpacking: Carefully remove all packaging materials and accessories. Check for any damage.
- Placement: Place the appliance on a stable, level, heat-resistant surface. Ensure there is adequate space (at least 4 inches) on all sides and above for proper ventilation. Do not place near heat sources or over a sink.
- Power Connection: Plug the power cord into a grounded electrical outlet. Ensure the outlet voltage matches the appliance's requirements.
- Initial Cleaning: Before first use, wipe the interior and exterior with a damp cloth. Wash the glass turntable, crumb tray, baking pan, and chrome rack in warm, soapy water. Dry thoroughly.
Operating Instructions
Setting the Clock
- Press the CLOCK button.
- Use the UP and DOWN arrow buttons to set the hour.
- Press the CLOCK button again.
- Use the UP and DOWN arrow buttons to set the minutes.
- Press the CLOCK button one more time to confirm.
Microwave Mode (700 Watts)
Use this mode for rapid heating, cooking, and defrosting. Always ensure the glass turntable is in place.
- Place food in a microwave-safe container on the glass turntable.
- Press the MODE button until "MICROWAVE" is displayed.
- Use the UP and DOWN arrow buttons to set the cooking time.
- Press START to begin cooking.
Defrost Function:
- Press the DEFROST button.
- Use the UP and DOWN arrow buttons to select defrost time or weight.
- Press START.
Toaster Oven Mode (1500 Watts)
This mode is suitable for baking, broiling, and toasting. Remove the glass turntable and use the baking pan and chrome rack as needed.
- Place food on the baking pan or chrome rack.
- Press the MODE button until "BAKE", "BROIL", or "TOAST" is displayed.
- For "BAKE" or "BROIL", use the TEMP button and arrow buttons to set the desired temperature, then set the cooking time with the arrow buttons.
- For "TOAST", use the arrow buttons to select the desired toast shade/time.
- Press START to begin.
Preset Functions
The appliance includes convenient preset options for common items:
- POPCORN: For microwave popcorn.
- BEVERAGE: For reheating drinks.
- REHEAT: For reheating prepared foods.
To use a preset:
- Press the desired preset button (e.g., POPCORN).
- Press START.
Care and Maintenance
Regular cleaning and maintenance will ensure the longevity and optimal performance of your appliance.
- Exterior: Wipe the exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Interior: Clean the interior cavity with a damp cloth and mild detergent after each use. For stubborn stains, a mixture of water and lemon juice can be used.
- Glass Turntable: The glass turntable can be washed in warm, soapy water or in the dishwasher.
- Crumb Tray: Regularly remove and empty the crumb tray. Wash it in warm, soapy water.
- Baking Pan & Rack: Wash these accessories in warm, soapy water.
- DO NOT immerse the appliance, cord, or plug in water or any other liquid.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Appliance does not turn on. | Not plugged in; power outage; circuit breaker tripped. | Ensure plug is securely in outlet; check household circuit breaker; test outlet with another appliance. |
| Food not heating/cooking properly in microwave mode. | Door not closed securely; incorrect cooking time/power level; metal objects inside. | Ensure door is fully latched; adjust time/power; remove any metal items. |
| Toaster oven not heating. | Incorrect mode selected; temperature not set. | Verify "BAKE", "BROIL", or "TOAST" mode is active; set desired temperature and time. |
| Turntable not rotating. | Turntable not properly seated; obstruction. | Reposition turntable correctly; remove any food debris or obstructions. |
If the problem persists after trying these solutions, contact customer support.
Specifications

Image: The Rival MT660 appliance shown with its dimensions: 17.75 inches wide, 14 inches deep, and 11.5 inches high.
| Feature | Detail |
|---|---|
| Model Number | MT660 |
| Brand | Rival |
| Product Dimensions (D x W x H) | 14" x 17.75" x 11.5" |
| Capacity | 0.6 cubic feet |
| Microwave Wattage | 700 watts |
| Toaster Oven Wattage | 1500 watts |
| Material | Glass (turntable) |
| Installation Type | Countertop |
| Item Weight | 39.9 pounds |
| UPC | 048894552472 |
Warranty and Support
This Rival MT660 Microwave/Toaster Oven Combination comes with a limited warranty.
- Warranty Period: 30 days from the date of purchase.
- This warranty covers defects in materials and workmanship under normal household use.
- It does not cover damage resulting from misuse, abuse, accidents, alteration, or commercial use.
For warranty claims or technical support, please refer to the contact information provided with your purchase documentation or visit the official Rival website.